- Thermal and structural studies of amide complexes of transition metal(II) chlorides. II: Kinetics
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The possibility of correlating the kinetic parameters for the thermal decompositions of a series of NiLCl2 complexes, where L=N-methylformamide (nmf), N-methylacetamide (nma) or acetamide (aa), with the nature (steric and electronic effects) of the coordinated ligands and the strengths of the metal-ligand bonds has been explored. The rates of removal of L in single endothermic processes were measured using isothermal TG in nitrogen. Plots of α against time are deceleratory and are best described by either the R2 or R3 expressions. An empirical (B2) expression: vr=1-(kt)b, was introduced to give the best description of the results for the Ni(nma)Cl2 complex. Comparable Ea values were obtained using various isothermal and non-isothermal methods of analysis. Ea values for the NiLCl2 system (calculated using the R3 model) generally increased with an increase in basicity of the amide ligand:N-methylformamide~acetamidea values were found to be lower than the corresponding decomposition enthalpies (ΔHL), indicating that cleavage of the nickel-amide bond could be the rate-controlling event. The order of Ea values was found not to coincide with that of the ΔHL values. Extrapolated onset temperatures (Te) and temperatures at maximum decomposition rate (Tmax) were determined from TG and DSC curves. No simple correlation was found between Ea, ΔHL, Te or Tmax and the spectral properties of the complexes.
- Nelwamondo, Aubrey N.,Eve, Desmond J.,Brown, Michael E.
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- Non-isothermal kinetic and thermodynamic study for the dehydration of copper(II) chloride dihydrate and nickel chloride hexahydrate
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Non-isothermal dehydration of copper chloride dihydrate and nickel chloride hexahydrate were studied by using TG, DTG, DTA and DSC measurements. The copper chloride salt loses its two water molecules in one step while nickel chloride salt dehydrates in three consecutive steps. The first two steps involve the loss of 4 water molecules in two overlapped steps while the third step involves the dehydration of the dihydrate salt to give the anhydrous NiCl2. Activation energies (ΔE) and the frequency factor (A) were calculated from DTG and DTA results. We have also calculated the different thermodynamic parameters, e.g. enthalpy change (ΔH), heat capacity (Cp) and the entropy change (ΔS) from DSC measurements for both reactants. The isothermal rehydration of the completely dehydrated salts was studied in air and under saturated vapour pressure of water. Anhydrous nickel chloride was found to rehydrate in three consecutive steps while the copper salt rehydrated in one step.
- Mohamed, M. A.,Halawy, S. A.
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- A co-reduction-silicification route to δ-Ni2Si nanowire
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δ-Ni2Si nanowires have been synthesized via a co-reduction-silicification route, using anhydrous NiCl2 and SiCl4 as nickel source and silicon source, respectively, and metallic Na as reductant in an autoclave at 600°C for 16 h. Transmission electron microscopy (TEM) observations show that the diameters of nanowires ranged in 10-100 nm and lengths up to several tens micrometers. The possible formation mechanism is discussed. Copyright
- Yang, Baojun,Hu, Hanmei,Wu, Yucheng,Luo, Tao,Yang, Xiaogang,Qian, Yitai
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- Covalent embedding of Ni2+/Fe3+ cyanometallate structures in silica by sol-gel processing
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Compound [Ni(AEAPTS)2]3[Fe(CN)6] 2 (AEAPTS=N-(2-aminoethyl)-3-aminopropyltrimethoxysilane), in which Ni2+ and Fe3+ ions are ferromagnetically coupled through cyano bridges, was prepared. Sol-gel processing of the AEAPTS derivative resulted in incorporation of the cyanometallate in silica. The obtained material is magnetically ordered below 22 K with an effective magnetic moment μeff of 4.46 μB at room temperature, a maximum of 8.60 μB at approximately 15 K and a narrow hysteresis at 2 K, with a saturation remanence of about 300 emu mol-1 and a coercitivity of 0.03 T. Magnetic crowd: [Ni(AEAPTS)2]3[Fe(CN) 6]2 (AEAPTS = N-(2-aminoethyl)-3- aminopropyltrimethoxysilane) was covalently tethered to silica gel. The obtained material is magnetically ordered below 22 K with an effective magnetic moment μeff of 4.46 μB at room temperature, a maximum of 8.60 μB at approximately 15 K, and a narrow hysteresis at 2 K (saturation remanence≈300 emu mol-1, coercitivity 0.03 T).
- Felbermair, Elisabeth,Sidorenko, Andrey,Paschen, Silke,Akbarzadeh, Johanna,Peterlik, Herwig,Schubert, Ulrich
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- Reactivity of ammonium chloride/mercuric chloride mixtures with monel containers. The new compounds (NH4)2(NH3)x[Ni(NH3) 2Cl4] and (NH4)5Cl2[CuCl2] [CuCl4]
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Ammonium chloride/mercuric chloride mixtures (molar ratio 2:1) react at 350°C with Monel (Cu68Ni32) to yield (NH4)NiCl3 and mercury and copper amalgam, respectively. With larger amounts of (NH4)Cl in the reaction mixture, dark green (NH4)2(NH3)x[Ni(NH3) 2Cl4] (x ≈ 0.77) (1) is also formed as a main product. Light blue crystals of the mixed-valent copper(I,II) chloride (NH4)5Cl2[CuCl2] [CuCl4] (2) were obtained as a minor byproduct from a 4:1 reaction mixture. The crystal structures were determined from single crystal X-ray data; (1): tetragonal, I4/mmm, a = 770.9(1), c = 794.2(2) pm, 190 reflections, R1 = 0.0263; (2): tetragonal, I4/mcm, a = 874.8(1), c = 2329.2(3) pm, 451 reflections, R1 = 0.0736. In (1) Ni2+ resides in trans-[Ni(NH3)2Cl4]2- octahedra, and in (2) copper(I) is linearly two-coordinated in [CuCl2]- and copper(II) resides in a flattened tetrahedron [CuCl4]2- with a tetrahedricity of 89%.
- Meyer, Gerd,Nockemann, Peter
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- An analysis of the electronic spectra of some nickel(II) halide amine complexes
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The diffuse reflectance spectra (30,000-10,000 cm.-1) of 28 six-coordinate nickel(II) complexes of microsymmetry NiN2X (N = amine, X = Cl or Br) are analyzed in terms of octahedral stereochemistry. It is shown that the rule of averag
- Lever,Nelson,Shepherd
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- Standard enthalpy of formation of Cl2(cr) as determined by solution-reaction calorimetry
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The standard molar enthalpy at 298.15 K was determined by solution-reaction calorimetry for the reaction: NiCl2(cr) + 6NH4Cl(cr) = Cl2(cr) + 6HCl(g).From the standard molar enthalpy of reaction, the standard molar enthalpy of formation of Cl2(cr) was derived.The derived value is in reasonably good agreement with a value given in the NBS tables of chemical thermodynamic properties, which was based on the analysis of the equilibria: NiCl2(cr) + NH3(g) = Cl2(cr), Cl2(cr) + NH3(g) = Cl2(cr), and Cl2(cr) + 4NH3(g) = Cl2(cr).
- Kuriyama, Nobuhiro,Sakiyama, Minoru
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- X-ray study of Kr and Xe adsorbed on the basal plane of nickel chloride
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X-ray scattering has been used to investigate the structure and phase transitions of Xe and Kr films adsorbed on the basal plane of NiCl2.The x-ray scattering measurements were carried out both as a function of temperature at fixed coverage and as a function of coverage at fixed temperature in the monolayer and bilayer coverage regimes.The results indicate that both the monolayers of Xe and Kr adsorbed on the basal plane of NiCl2 form a 2D solid of the simple triangular structure incommensurate with the substrate and 2D melting is first order in the incommensurate solid of Xe but continuous in that of Kr.With tha addition of the second-layers atoms the interparticle distance of the adsorbed atoms reduces and the crystallinity of the incommensurate solid improves.
- Morishige, K.,Hanayama, M.,Kittaka, S.
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- X-ray diffraction, spectral and magnetic studies of the nickel(II) thiocyanate complexes with tridentate 2,6-dithiocarboxamidopyridine SNS and 2,6-dicarboxamidopyridine ONO ligands: Influence of donor atoms on the coordination geometry of nickel
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The systematic investigation of electronic effects on the coordination geometry of nickel(II) thiocyanate complexes with the tridentate N,N,N′,N′-tetraethylpyridine-2,6-dithiocarboxamide (S-dept) and N,N,N′,N′-tetraethylpyridine-2,6-dicarboxamide (O-deap) ligands shows a significant change in the geometry of the metallic site. Their complexes conform to composition [Ni2(μ-NCS)2(S-dept) 2(NCS)2] (1), [Ni(NCS)2(O-deap)(CH 3CN)] ? CH3CN (2) and [Ni(NCS)2(O-deap) (C2H5OH)] (3), respectively. X-ray crystallographic studies were done for 1-3. In the crystal lattice, complex 1 exists as a centrosymmetric dimer in which the dinuclear core is bridged by two N-bonded thiocyanate groups. The near octahedral geometry of the nickel atom is achieved through the two bridging N atoms of the thiocyanate groups, three SNS donor atoms of the ligand S-dept and through the terminal nitrogen atom of a non-bridging thiocyanate moiety. To the best of our knowledge, complex 1 presents the first example in literature with the highest asymmetry in N-bridging thiocyanato ligands. Ni ion is coordinated to ONO donor set of atoms of O-deap and two N-bonded NCS terminal groups. The sixth coordination site is completed by the N atom of an acetonitrile molecule. The coordination around Ni atom in 3 is also distorted octahedral. The change in the sixth coordination position from acetonitrile in 2 to ethanol in 3 has a profound influence in the overall topology of the metal-ligand complex. The complex interplay of weak interactions in stabilizing the 3-dimensional lattice of these molecules is well demonstrated.
- Kapoor, Ramesh,Kataria, Ashok,Pathak, Anuradha,Venugopalan, Paloth,Hundal, Geeta,Kapoor, Pratibha
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- Anodic Dissolution of Nickel Sulfide in Acidic Cu(II) Electrolytes
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The effect of ligands on the anodic dissolution of NiS in copper-containing acidic electrolytes was studied.
- Natorkhin
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- Three new O,N-coordinated Ni(II) complexes: Syntheses, crystal structures, and MOCVD applications
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Three new O,N-coordinated nickel (II) complexes, namely, Ni(dmpda(acac)2) (1), Ni(pda)(acac)2 (2) and Ni(pda)(tfac)2 (3) have been synthesized ((dmpda(acac)2 e N,N0-(2,2-dimethyl-1,3-diaminopropane)-bis-( 2,4-pentanedioniminoato(2-), acac e 2,4-pentanedionato, pda e 1,3-diaminopropane, tfac e 1,1,1-trifluoroacetylacetonato and tested as new precursors for metaleorganic chemical vapor deposition (MOCVD). The structures of 1e3 were determined by single-crystal X-ray diffraction (XRD) and further characterized by IR and Raman spectroscopies. All three compounds crystallize in the triclinic space group P1 with unit cell parameters of a = 9.0294(6), b = 9.2879(6), c = 10.4065(6)γA, a = 74.855(3), b = 68.717(3), g = 78.708(3) for 1; a = 7.6947(2), b = 10.3087(3), c = 10.7144(3)A, a = 101.784(1), b = 95.367 (1), g = 106.134(1) for 2; and a = 7.8931(5), b = 10.8803(8), c = 10.9438(7)A, a = 103.283(2), b = 97.070(3), g = 103.050(2) for 3. The density functional theory (B3LYP) quantum chemical calculations have been used for detailed assignment of all intense bands in the vibrational spectra of the compounds studied. Thermal gravimetric analysis (TG/DTA) has shown that the species 1 and 3 sublime almost without decomposition, and 2 decomposes to some extent. MOCVD test experiments were carried out at low pressure (10 Torr) using 1 and 3 as precursors on Ta/Si substrates. The films have been characterized by X-ray powder diffraction, scanning electron microscopy, and energy dispersive spectroscopy were found to be primarily composed either of fcc-Ni or Ni3C phases. The phase composition of the films strongly depends on the MOCVD conditions. Crown Copyright.
- Dorovskikh, Svetlana I.,Alexeyev, Aleksey V.,Kuratieva, Natalia V.,Basova, Tamara V.,Kiselev, Vitaly G.,Sheludyakova, Liliya A.,Shubin, Yury V.,Morozova, Natalia B.,Igumenov, Igor K.
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- Carbene transfer reactivities of nickel(II)-N-heterocyclic carbene complexes and their applications in the synthesis of metal-NHC complexes
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We describe a new synthetic procedure for transition-metal N-heterocyclic carbene complexes (NHCs). A number of Pd(II), Pt(II), Co(III), and Ru(II) complexes containing functionalized NHCs have been obtained in good to excellent yields using NiII-NHC complexes as carbine transfer reagents. NiII-NHC complexes are easily prepared from the direct reactions of the corresponding imidazolium salts with commercially available Raney nickel powder. The byproduct of transmetalation reactions, NiCl2, can be easily removed by simple filtration. This study offers a new, economical, and practical synthetic method for metal-NHC complexes.
- Liu, Bo,Liu, Xiaolong,Chen, Chao,Chen, Congyan,Chen, Wanzhi
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- Nickel-Catalyzed Coupling of Arylzinc Halides with Thioesters
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The Pd-catalyzed Fukuyama reaction of thioesters with organozinc reagents is a mild, functional-group-tolerant method for acylation chemistry. Its Ni-catalyzed variant might be a sustainable alternative to expensive catalytic Pd sources. We investigated the reaction of S-ethyl thioesters with aryl zinc halides with hetero- and homotopic Ni precatalysts and several ligands. The results show that both homo- and heterotopic species may contribute to catalysis. The substrate scope using an operationally homogeneous defined Ni complex was established. Acyl radicals are postulated as short-lived intermediates.
- Gehrtz, Paul H.,Kathe, Prasad,Fleischer, Ivana
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supporting information
p. 8774 - 8778
(2018/06/26)
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- Reductive Homocoupling of Organohalides Using Nickel(II) Chloride and Samarium Metal
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A homocoupling method for organohalides and organosulfonates promoted by samarium metal and HMPA, and catalyzed by NiCl2 has been developed. Various organohalides (benzyl, aryl, heterocyclic, alkenyl and alkyl halides), α-haloacetophenones, and phenyl organosulfonates were tolerated, and the reaction afforded coupling products with high efficiency. Excellent chemoselectivity was exhibited between halides and other groups, such as ?COOH, ?NO2, halogen, heterocyclic ring, ester, and ketone groups. The stereoselectivity suggested that the reaction mechanism might involve an organosamarium species.
- Liu, Yongjun,Xiao, Shuhuan,Qi, Yan,Du, Feng
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supporting information
p. 673 - 678
(2017/03/22)
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- Preparation method of battery grade nickel acetate
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The invention relates to a preparation method of battery grade nickel acetate, and aims at providing a preparation method of battery grade nickel acetate, which is simple in production principle and wide in raw material source and facilitates industrial production. The preparation method of the battery grade nickel acetate comprises the following steps: metallic nickel powder and an acid copper chloride solution react, impurity removal and evaporation are carried out, and NiCl2 is obtained; NiCl2 is mixed with a sodium hydroxide solution fully, after filtration, Ni(OH)2 is obtained, nickelous hydroxide is washed and then is acidified by acetic acid, and nickel acetate is generated finally. The nickel acetate prepared by the preparation method is high in purity. The preparation method is applied to the technical field of chemical production.
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Paragraph 0032; 0034
(2017/08/29)
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- New complexes of 4-[(4-fluorophenyl)amino]-4-oxobut-2-enoic acid with selected transition metal ions: Synthesis, thermal, and magnetic properties
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Complexes of 4-[(4-fluorophenyl)amino]-4-oxobut-2-enoic acid, HL, with Mn(II), Co(II), Ni(II), Cu(II), Nd(III), Gd(III), and Er(III) were synthesized and characterized by various physico-chemical methods: elemental analysis, FT-IR, TG, DTG, DSC, TG/FT-IR, XRF, XRD, and magnetic measurements using the Gouy’s method and a SQUID-VSM magnetometer. The complexes were found to be hydrates (except Er(III) complex) containing 1 to 4 molecules of water. The carboxylate groups acted as bidentate ligands.
- Ferenc,Sadowski,Tarasiuk,Cristóv?o,Osypiuk,Sarzyński
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p. 2719 - 2727
(2017/12/26)
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- Nazarov cyclization of divinyl and arylvinyl epoxides: Application in the synthesis of resveratrol-based natural products
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New variation in the Nazarov cyclization has been developed by preparing divinyl and arylvinyl epoxides as pentadienyl cation precursors for the first time. Highly substituted cyclopentadienes, hydrindienes, and indenes were synthesized to demonstrate the compatibility of this reaction with substrates bearing a variety of substitutions and having different types of epoxides. Application of this method in the synthesis of resveratrol-based natural products was also demonstrated.
- Sudhakar, Gangarajula,Satish, Kovela
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supporting information
p. 6475 - 6480
(2015/04/22)
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- Stereoselective synthesis of arylglycine derivatives via palladium-catalyzed α-arylation of a chiral nickel(II) glycinate
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A practical and efficient stereoselective synthesis of arylglycine derivatives was realized via palladium-catalyzed α-arylation of a chiral nickel(II) glycinate complex with aryl bromides. The structurally diverse arylglycine products were obtained in excellent isolated yields and with good diastereoselectivity. A simple acidic hydrolysis furnished optically pure arylglycines in high yield, and the chiral ligand (S)-BPB could be efficiently recovered and reused.
- Zhang, Fan,Sun, Hengzhi,Song, Zhuang,Zhou, Shuxi,Wen, Xiaoan,Xu, Qing-Long,Sun, Hongbin
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p. 4459 - 4464
(2015/05/13)
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- Acid-catalyzed aquation of ni(II)-hydrazone complexes: Kinetics and solvent effect
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Complexes of the type [Ni(L)(H2O)]Cl2·nH 2O, where L = 2-pyridyl-3-isatinbishydrazone ligands, have been synthesized and characterized on the bases of elemental analysis, molar conductance, IR, electronic spectra, and ther
- Mohamad, Ahmad Desoky M.,Rabia, Mostafa K.,Ismail, Nabawia M.,Mahmoud, Ali Abdo
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p. 451 - 461
(2014/07/08)
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- Synthesis, structure and reactivity of NHC-nickel complexes containing carbonato ligands
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Reactions of different alkane-bridged (n = 1-3) di-NHC precursors, bisimidazolium chlorides with the NiCl2 in presents of K 2CO3 in acetonitrile give the corresponding 16-electron binuclear complexes of the type Ni(di-NHC)(μ-O)2CO in moderate yield. The molecular structures of 1-3 have been determined by X-ray crystallography, which revealed a cis-chelating di-NHC on a slightly distorted square-planar nickel center with κ2-cabonato ligand. The influence of the different di-NHC ligands on the structure and reactivity of the complexes has been studied. The catalytic properties of the complexes were investigated in the Kumada reaction for cross-coupling of phenylmagnesium bromide with a variety of aryl halides. The complex 3 which has the longest linker between two NHCs shows the best catalytic activity in these reactions.
- Guo, Jin,Lv, Lanlan,Wang, Xiaojun,Cao, Changsheng,Pang, Guangsheng,Shi, Yanhui
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- Optimization of Reaction Conditions for High Yield Synthesis of Carbon Nanotube Bundles by Low-Temperature Solvothermal Process and Study of their H2 Storage Capacity
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Synthesis of Carbon Nanotube bundles has been achieved by simple and economical solvothermal procedure at very low temperature of 180°C. The product yield obtained was about 70-75%. The optimization of reaction conditions for an efficient synthesis of CNT
- Krishnamurthy,Agarwal, Sarika
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p. 3046 - 3054
(2014/01/06)
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- Microwave-assisted carbohydrohalogenation of first-row transition-metal oxides (M = V, Cr, Mn, Fe, Co, Ni, Cu) with the formation of element halides
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The anhydrous forms of first-row transition-metal chlorides and bromides ranging from vanadium to copper were synthesized in a one-step reaction using the relatively inexpensive element oxides, carbon sources, and halogen halides as starting materials. The reactions were carried out in a microwave oven to give quantitative yields within short reaction times.
- Berger, Matthias,Neumeyer, Felix,Auner, Norbert
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supporting information
p. 11691 - 11693
(2013/11/19)
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- Comparative studies of mononuclear Ni(II) and UO2(II) complexes having bifunctional coordinated groups: Synthesis, thermal analysis, X-ray diffraction, surface morphology studies and biological evaluation
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Two Schiff base ligands derived from condensation of phthalaldehyde and o-phenylenediamine in 1:2 (L1) and 2:1 (L2) having bifunctional coordinated groups (NH2 and CHO groups, respectively) and their metal complexes with N
- Fahem, Abeer A.
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- Vinyl polymerization of norbornene on nickel complexes with bis(imino)pyridine ligands containing electron-withdrawing groups
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A series of novel bis(imino)pyridine nickel(II) dichloride complexes, with the bis(imino)pyridine ligands containing electron-withdrawing groups (F, Cl, Br, CF3), have been prepared and characterized by elemental analysis and NMR spectroscopy. All complexes exhibit paramagnetically shifted 1H NMR spectra, indicative of the high-spin (S = 1) state of the d8 nickel(II) central atom. These complexes have been found to be highly active catalysts of vinyl-type norbornene polymerization upon activation with MAO, displaying activities up to 1.16 × 107 g of PNB (mol of cat.)-1 h-1 (the highest ever reported for norbornene polymerizations on bis(imino)pyridine nickel complexes) and yielding high-molecular-weight polynorbornene (Mw up to 4.5 × 10 6). X-ray structures for some of the nickel complexes are reported.
- Antonov, Artem A.,Semikolenova, Nina V.,Zakharov, Vladimir A.,Zhang, Wenjuan,Wang, Youhong,Sun, Wen-Hua,Talsi, Evgenii P.,Bryliakov, Konstantin P.
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p. 1143 - 1149
(2012/04/10)
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- Improved dehydrogenation properties of lithium alanate (LiAlH4) doped by low energy grinding
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LiAlH4 is an attractive hydrogen storage material because of its high gravimetric hydrogen storage capacity of 10.5 wt.%. There are various reports in the literature on doping LiAlH4 with transition metals in order to improve its deh
- Fu, Jie,R?ntzsch, Lars,Schmidt, Thomas,Wei?ga?rber, Thomas,Kieback, Bernd
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- Polymer complexes. LIV. Structural and spectral studies of supramolecular coordination polymers built from Ni(II), Fe(II) and Pd(II) with sulphadrug
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Polymer complexes of p-acrylamidyl sulphaguanidine (HL) with Ni(II), Fe(II) and Pd(II) salts have been prepared. The structures of the polymer complexes were elucidated using elemental analysis, 1H NMR, UV-Vis, IR spectroscopies, magnetic moment, molar conductance and thermal analysis. The polymer complexes were isolated in 1:1 and 1:2 (M:L) ratios. The solid monocomplexes (1:1) (M:L) were isolated in the general formula [Fe(HL)O 2SO2(OH2)2]. The biscomplexes (1:2) (M:L) solid chelates found to have the general formula [Ni(HL)2X 2]n (X = Cl-, Br-, I-, NO3, NCS- ), [Fe(HL)(en)(OSO3)(OH 2)]n and [Ni(HL)2(Py)2] nX2, while {[Pd(L)X]2}n (1:1) (X = Cl- or Br-). In all the polymer complexes the ligand and anions were found to be coordinated to the Ni(II) and Fe(II) ions. The bidentate nature of the ligand is evident from IR spectra. The magnetic and spectroscopic data indicate a octahedral geometry for complexes. The thermal behaviour of these chelates shows that the hydrated complexes loss water molecules of hydration in the first step followed immediately by decomposition of the anions and ligand molecules in the subsequent steps.
- El-Sonbati,Belal,Diab,Mohamed
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- Synthesis, spectral and X-ray structural studies of a NO donor Schiff base ligand and its Ni(II) complexes
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The Schiff base ligand, 4-isopropylbenzaldehyde[N-(3-oxo-3,4-dihydro-2- quinoxalinyl)hydrazone] (Ipbh), the 1:1 condensation product of 4-isopropylbenzaldehyde and 2-hydroxy-3-hydrazinoquinoxiline, has been synthesized and characterized by X-ray crystallography. A series of complexes of Ipbh with Nickel(II), viz., [Ni(Ipbh)2]Cl2 (1), [Ni(Ipbh)2]Br2 (2), [Ni(Ipbh)2]I2 (3), [Ni(Ipbh)2·(CH3OH)2](NO 3)2·(CH3OH)2 (4) and [Ni(Ipbh)2ClO4]ClO4 (5) have been synthesized. All the complexes were characterized by elemental analysis, molar conductivity, CHN analysis, spectroscopic studies, magnetic susceptibility measurements and TG/DTA methods. The solid-state structure of the complex 4 was established by single crystal X-ray crystallography. In all the complexes, Ipbh acts as a bidentate NO chelating agent, coordinated to the metal ion through the imine nitrogen and quinoxaline oxygen. In complex 4, Nickel(II) is in a distorted octahedral environment with an identical set of donor atoms, N2O 4, coming from two imine nitrogen and two quinoxaline oxygen atoms of two Ipbh moieties as well as two oxygen atoms of the two methanol molecules. The crystal packing of Ipbh and the complex 4 exhibits 1D and 2D supramolecular networks, respectively through different intermolecular hydrogen-bonding interactions.
- Vimal Kumar,Radhakrishnan
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- Synthesis and structural characterization of Ni(II) complexes containing a heterocyclic NO donor ligand
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Five novel nickel(II) complexes have been successfully synthesized with a heterocyclic ligand, Opdac, [Ni(Opdac)2]Cl2 (1), [Ni(Opdac)2(CH3OH)2]Br2(CH 3OH)2 (2), [Ni(Opdac)2]I2 (3), [Ni(Opdac)2NO3]NO3 (4) and [Ni(Opdac) 2ClO4]ClO4 (5) where Opdac = 4-(1-H-1,3-benzimidazole-2-yl)-1,5-dimethyl-2-phenyl-1-2-dihydro-3-H-pyrazol-3- one. All the complexes were characterized by elemental analysis, molar conductivity, CHN analysis, magnetic susceptibility measurements, spectroscopic studies and TG/DTA methods. In all the complexes, Opdac acts as a bidentate ligand coordinating to Ni(II) ion via the benzimidazole imine nitrogen and the pyrazolone oxygen atoms. The complexes 1 and 3 have a tetrahedral geometry while 2, 4 and 5 have an octahedral geometry around the Ni(II) center.
- Vimal Kumar,Radhakrishnan
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p. 2849 - 2855
(2011/12/14)
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- Strontium nickel and barium nickel selenites: Synthesis and X-ray diffraction parameters
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A new strontium nickel selenite, Sr2Ni(SeO3) 3, was prepared and structurally characterized. The compound crystallizes in triclinic system (space group P1?, a = 7.2860(10) ?, b = 7.581(2) ?, c = 8.722(2) ?, α = 103.02(2)°, β = 105.580(10)°, γ = 95.260(10)°, Z = 2) and is isostructural to cobalt and copper analogues. The structure of Sr2Ni(SeO 3)3 is a three-dimensional framework built of eight-vertex polyhedra [SrO8] and distorted octahedra [NiO6] sharing edges and vertices. The framework channels accommodate selenium atoms bonded to the framework oxygen atoms. The selenite groups SeO3 are pyramidal, which is indicative of high stereochemical activity of the Se(IV) lone pair. The possibility of replacement of some Ni atoms by Cu in Sr2Ni(SeO 3)3 was studied. The search for analogous barium phases did not reveal such compounds, but BaM(SeO3)2 phases were found, where M = Co, Ni, or Cu. The unit cell parameters of the new selenite BaM(SeO3)2 were determined: space group Pnma, a = 14.989(5) ?, b = 5.439(2) ?, c = 7.161(3) ?, Z = 4.
- Berdonosov,Batunin,Olenev,Dolgikh
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- A group of new selenite-chlorides of strontium and d-metals (Co,Ni): Synthesis, thermal behavior and crystal chemistry
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The new selenite-chlorides with composition Sr3(SeO3)2Cl2 (I) and Sr2M(SeO3)2Cl2 (M=Co, Ni (II and III)) were obtained. They crystallize in monoclinic system I: space
- Berdonosov, Peter S.,Olenev, Andrey V.,Kuznetsov, Alexei N.,Dolgikh, Valery A.
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- Electrodeposition of RE-TM (RE = La, Sm, Gd; TM = Fe, Co, Ni) films and magnetic properties in urea melt
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Rare earth (RE)-3d transition metal (TM) films were codeposited in low temperature urea-acetamide-NaBr-KBr-RECl3-TMCl2 baths by potentiostatic electrolysis. Cyclic voltammetry is used to investigate the electrochemical behavior of RE
- Li, Jiaxin,Lai, Heng,Fan, Biqiang,Zhuang, Bin,Guan, Lunhui,Huang, Zhigao
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p. 547 - 551
(2009/10/30)
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- Infrared spectra of small insertion and methylidene complexes in reactions of laser-ablated nickel atoms with halomethanes
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Nickel carbene complexes, CX2=NiX2, are prepared along with the insertion products, CX3-NiX, in reactions of laser-ablated Ni atoms with tetrahalomethanes. These reaction products are identified from matrix infrared spectr
- Cho, Han-Gook,Andrews, Lester,Vlaisavljevich, Bess,Gagliardi, Laura
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p. 5623 - 5632
(2010/01/06)
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- Ambient temperature imidazolium-based ionic liquids with tetrachloronickelate(II) anions
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Deep blue tetrachloronickelate(II) salts of 1-alkyl-3-methylimidazolium cations [Cnmim]+ with intermediate chain lengths (n = 5, 7, 8 and an n = 4/6 mixture) have been prepared from imidazolium chlorides and NiCl2. They are liquid at ambient temperatures (ca. 20 °C) and above, and display viscosities and thermal stability comparable to related [BF4]- compounds. The similarities may reflect the compensating effects of the dinegative charge of the [NiCl4]2- ion and its larger size.
- Meredith, M. Brett,McMillen, C. Heather,Goodman, Jonathan T.,Hanusa, Timothy P.
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p. 2355 - 2358
(2011/04/22)
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- Mono- and dinuclear nickel complexes with phosphino-, phosphinito-, and phosphonitopyridine ligands: Synthesis, structures, and catalytic oligomerization of ethylene
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The P,N-type ligands 2-[(diphenylphosphino)methyl]pyridine (12), 2-[2-(diphenylphosphino)ethyl]pyridine (13), 2-methyloxy(diphenylphosphino) pyridine (14), 2-methyloxy(dibenzyl-1,2-oxaphosphorino)pyridine (15), and 2-methyloxy(di-tert-butylphosphino)pyridine (16) have been prepared in good yields, and 12 and 13 have been used to synthesize Ni(II) complexes of formula [Ni(P,N)Cl2], 17 (P,N = 12) and 18 (P,N = 13), by reaction with NiCl2 in methanol. The crystal structure of 18 has been determined by X-ray diffraction to be dinuclear with a distorted square-base pyramidal geometry around the Ni(II) centers. To examine the possible influence of the nature of the spacer link between the P and N donor atoms, we compared ligand 13, with a CH2CH2 spacer, with 14 and 16, which have a isosteric CH2-O spacer. Reactions of the phosphinitopyridine ligands 14 and 16 and of the phosphonitopyridine 15 with [NiX2(DME)] (X = Cl or Br) afforded the complexes [Ni(P,N)Cl2] 20 (X = Cl; P,N = 14), 21 (X = Br; P,N = 14), 22 (X = Cl; P,N = 16), and 23 (X = Cl; P,N = 15), respectively. The mononuclear structure of complex 22 has been established by X-ray diffraction and showed a distorted tetrahedral geometry around the metal center. Complexes 17, 18, and 20-22 have been tested as precatalysts in the oligomerization of ethylene, with AlEtCl2 or MAO as cocatalyst, in order to evaluate the influence of the stereoelectronic properties of the phosphorus substituents. With only 6 equiv of AlEtCl2 as cocatalyst and 4 × 10-5 mol precatalyst, complex 18 was the most active, with turnover frequencies (TOF) up to 91 200 C2H4/(mol Ni·h), and 20 with 2 equiv of AlEtCl2 showed the highest selectivities for ethylene dimers (up to 97%) and in 1-butene (up to 72%). When only 10-5 mol precatalyst was used, the TOF values went up to 207 600 for 18 and 150 100 for 20. With only 25 equiv of MAO as cocatalyst, complex 18 was again the most active, with TOF values up to 20 600 C2H 4/(mpl Ni·h). Despite the high selectivity for C4 olefins of 17, 18, 20, and 21 (up to 93% for 20), 22 presented the best selectivities for 1-butene (up to 73%) with MAO as cocatalyst, and its high reactivity for the reinsertion of 1-butene resulted in 2-ethyl- 1-butene being the main product of the catalytic reaction (up to 91%).
- Kermagoret, Anthony,Braunstein, Pierre
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- Indirect, reversible high-density hydrogen storage in compact metal ammine salts
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The indirect hydrogen storage capabilities of Mg(NH3) 6Cl2, Ca(NH3)8Cl2, Mn(NH3)6Cl2, and Ni(NH3) 6Cl2 are investigated. All four metal ammine chlorides can be compacted to solid tablets with densities of at least 95% of the crystal density. This gives very high indirect hydrogen densities both gravimetrically and volumetrically. Upon heating, NH3 is released from the salts, and by employing an appropriate catalyst, H2 can be released corresponding to up to 9.78 wt % H and 0.116 kg H/L for the Ca(NH 3)8Cl2 salt. The NH3 release from all four salts is investigated using temperature-programmed desorption employing different heating rates. The desorption is found mainly to be limited by heat transfer, indicating that the desorption kinetics are extremely fast for all steps. During desorption from solid tablets of Mg(NH3) 6Cl2, Mn(NH3)6Cl2, and Ni(NH3)6Cl2, nanoporous structures develop, which facilitates desorption from the interior of large, compact tablets. Density functional theory calculations reproduce trends in desorption enthalpies for the systems studied, and a mechanism in which individual chains of the ammines are released from the surface of the crystal is proposed to explain the fast absorption/desorption processes.
- Sorensen, Rasmus Z.,Hummelshoj, Jens S.,Klerke, Asbjorn,Reves, Jacob Birke,Vegge, Tejs,Norskov, Jens K.,Christensen, Claus H.
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p. 8660 - 8668
(2009/02/03)
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- Crystal structures of Ni(AlCl4)2, Ni(GaCl 4)2 and Na[Ni(AlCl4)3]
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The crystal structures of Ni(AlCl4)2, Ni(GaCl 4)2 and Na[Ni(AlCl4)3] were determined by single crystal X-ray structure analysis. Ni(AlCl4) 2 and Ni(GaCl4)2 are isotypic and crystallize in the Co(AlCl4)2 structure type (I2/c, a = 1276.40(9)/1268.48(7), b = 771.41(5)/757,74(3), c = 1145.47(8)/1154.34(7) pm, β = 92.067(3)/91.778(4)°, Z = 4), The structure contains chains of NiCl6 octahedra and AlCl4/GaCl4 tetrahedra linked by corners and edges. Na[Ni(AlCl4)3] represents a new structure type (P21/c, a = 1356.34(6), b = 1200.82(6), c = 1213.31(6) pm, β = 105.647(6)°, Z = 4). Its characteristic feature is the chiral [Ni(AlCl4)3]- anion which is found here for the first time. The tetrachloroaluminate ions serve as bidentate ligands leading to an octahedral coordination of the nickel atom.
- Ke?ler, Ulrich,Müller, Rainhard
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p. 1052 - 1058
(2008/10/09)
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- Synthesis, physicochemical characterisation and chemical properties of the first nonaalkoxo-distannates and dititanates of nickel(II)
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Heterobimetallic alkoxides of the types [Ni{M2(OR) 9(μ-Cl)}]2 (1)-(4)and [Ni{M2(OR) 9}2] (5)-(8) (where M = Sn, Ti; R = Pri Et) have been prepared by the reactions of NiCl2.xROH (R = Pr i, Et) with M′(M2(OR)9) (M′ = Na, K) in 1:1 and 1:2 molar ratios in benzene respectively. The chloro complexes (1)-(4) on reactions with appropriate alkali metal alkoxides yield alkoxo analogues: [Ni{Sn2(OPri)9}(μ-OPr i)]2 (10), [Ni{Sn2(OEt)9}(μ-OEt)] 2 (11), [Ni{Ti2(OPri)9}(μ- OPri)]2 (12), [Ni{Ti2(OEt)9}(μ- OEt)]2 (13), [Ni{Sn2(OPri)9}(μ- OCH2CH2OCH3)]2 (14), [Ni{Sn 2(OEt)9}(μ-OCH2CH2 OCH 3)]2 (15), [Ni(Sn2(OPri) 9} (μ-OCH2CH2OC2H 5]2(16), [Ni{Sn2(OEt)9}(μ- OCH2CH2OC2H5)]2 (18), and [Ni{Sn2(OEt)9}(μ-OCH2CH 2NHCH3)]2 (19). All these omplexes have been characterized by elemental analyses, spectroscopic (UV-vis, and IR) and magnetic studies as well as by molecular weight measurements.
- Agrawal, Neetu,Singh, Anirudh
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p. 1938 - 1946
(2008/03/17)
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- Synthesis, characterization and biological activity of bis(phenylimine) Schiff base ligands and their metal complexes
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Metal complexes derived from 2,6-pyridinedicarboxaldehydebis(p-hydroxyphenylimine); L1, 2,6-pyridinedicarboxaldehydebis (o-hydroxyphenylimine); L2, are reported and characterized based on elemental analyses, IR, solid reflectance, ma
- Mohamed, Gehad G.
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p. 188 - 195
(2007/10/03)
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- A vapor-solid strategy to silica sheathed metal nanostructures and microstructures via reactions of metal chlorides with silicon
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A facile vapor-solid strategy has been developed to prepare silica-sheathed metal micro/nanostructures with controllable shapes. As examples, silica-sheathed nickel nanowires (diameter ~50 nm), microcubes (edge length 1-3 μm), nanocubes (edge length ~200 nm) with an epitaxial tail (diameter 2 structures are discussed. The method is expected to be applied to a wider range of metals.
- Wang, Jin,Zhang, Haoxu,Ge, Jianping,Li, Yadong
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p. 807 - 811
(2008/10/09)
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- On the chemical vapor transport of ternary transition metal- and earth
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The chemical vapor transport of transition metal tungstates MWO4 (M=Mn, Co, Ni, Cu, Zn, Cd) was investigated in dependence on mean transport temperature (923 K to 1223 K) and amount of transport agent Cl2. All tungstates migrate in a temperature gradient ΕT = 100 K from the region of higher temperature to the lower temperature with migration rates of 0.5 to 8 mg/h depending on experimental conditions. The transport behaviour was determined by continuous measurement of mass change during the transport experiments. The results were compared to thermo chemical calculations and the influence of moisture content discussed in detail. MgWO4 migrates under the influence of Cl2 in a temperature gradient 1273 K to 1173 K (migration rate 0.7 mg/h), CaWO4 and SrWO4 in a temperature gradient 1423 K to 1323 K (migration rate 0.1 mg/h).
- Steiner, Udo
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p. 1706 - 1714
(2008/10/09)
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- Second harmonic generation in boracites
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The M3B7O13X (M=Mg, Ni, Cd; X=Cl, Br, I) boracites were synthesized and characterized by x-ray diffraction and second harmonic generation. Their nonlinear optical susceptibility was estimated using the Phillips-Van Vechten
- Zagudailova,Plachinda,Berdonosov,Stefanovich,Dolgikh
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p. 393 - 396
(2008/10/09)
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- Synthesis of α-Amino Acids via Asymmetric Phase Transfer-Catalyzed Alkylation of Achiral Nickel(II) Complexes of Glycine-Derived Schiff Bases
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Achiral, diamagnetic Ni(II) complexes 1 and 3 have been synthesized from Ni(II) salts and the Schiff bases, generated from glycine and PBP (7) and PBA (11), respectively, in MeONa/MeOH solutions. The requisite carbonyl-derivatizing agents pyridine-2-carboxylic acid(2-benzoyl-phenyl)-amide 7 (PBP) and pyridine-2-carboxylic acid(2-formyl-phenyl)-amide 11 (PBA) were readily prepared from picolinic acid and o-aminobenzophenone or picolinic acid and methyl o-anthranilate, respectively. The structure of 1 was established by X-ray crystallography. Complexes 1 and 3 were found to undergo C-alkylation with alkyl halides under PTC conditions in the presence of β-naphthol or benzyltriethylammonium bromide as catalysts to give mono- and bis-alkylated products, respectively. Decomposition of the complexes with aqueous HCI under mild conditions gave the required amino acids, and PBP and PBA were recovered. Alkylation of 1 with highly reactive alkyl halides, carried out under the PTC conditions in the presence of 10% mol of (S)- or (R)-2-hydroxy-2′ -amino-1,1′-binaphthyl 31a (NOBIN) and/or its N-acyl derivatives and by (S)- or (R)-2-hydroxy-8′-amino-1,1′-binaphthyl 32a (iso-NOBIN) and its N-acyl derivatives, respectively, gave rise to α-amino acids with high enantioselectivities (90-98.5% ee) in good-to-excellent chemical yields at room temperature within several minutes. An unusually large positive nonlinear effect was observed in these reactions. The Michael addition of acrylic derivatives 37 to 1 was conducted under similar conditions with up to 96% ee. The 1H NMR and IR spectra of a mixture of the sodium salt of NOBIN and 1 indicated formation of a complex between the two components. Implications of the association and self-association of NOBIN for the observed sense of asymmetric induction and nonlinear effects are discussed.
- Belokon, Yuri N.,Bespalova, Natalia B.,Churkina, Tatiana D.,Cisarova, Ivana,Ezernitskaya, Marina G.,Harutyunyan, Syuzanna R.,Hrdina, Radim,Kagan, Henri B.,Kocovsky, Pavel,Kochetkov, Konstantin A.,Larionov, Oleg V.,Lyssenko, Konstantin A.,North, Michael,Polasek, Miroslav,Peregudov, Alexander S.,Prisyazhnyuk, Vladimir V.,Vyskocil, Stepan
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p. 12860 - 12871
(2007/10/03)
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- Materials and methods for the production and purification of chlorofluorocarbons and hydrofluorocarbons
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Methods and materials are provided for the production of essentially isomerically pure perhalogenated and partially halogenated compounds. One embodiment of the present invention provides a process for the production of essentially isomerically pure CFC-216aa. Other embodiments include processes for the production of CFC-217ba and HFC-227ea. Particular embodiments of the present invention provide separation techniques for the separation of chlorofluorocarbons from HF, from other chlorofluorocarbons, and the separation of isomers of halogenated compounds. Still other embodiments of the present invention provide catalytic synthetic techniques that demonstrate extended catalyst lifetime. In other embodiments, the present invention provides catalytic techniques for the purification of isomeric mixtures.
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- Thermochemistry of the complexes of some microelements and histidine
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Solid complexes of M(His)2Cl2·nH2O (M=Mn, Co, Ni, Cu) of MnCl2·6H2O, CoCl 2·6H2O, NiCl2·6H2O, CuCl2·2H2O and L-α-histidine (His) have been prepared in 95% ethanol solution and characterized by elemental analyses, chemical analyses, IR and TG-DTG. The constant-volume combustion energies of the complexes have been determined by a rotating-bomb calorimeter. The standard enthalpies of formation of the complexes have been calculated as well.
- Chen,Gao,Yang,Hu,Shi
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p. 967 - 975
(2008/10/08)
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- Reactions of the bis(iminophosphoranyl)methane ligand CH2(Ph2P=NSiMe3)2 with nickel(II) halides and the structural characterization of ligand fragmentation products
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While anhydrous nickel(II) chloride reacts with CH2(Ph2P=NSiMe3)2 to afford the pseudotetrahedral complex NiCl2[CH2(Ph2P=NSiMe3) 2] (2), the analogous reaction with anhydrous nickel(II) iodide gives the structurally related complex NiI2[CH2(PPh2=NSiMe3)(PPh 2=NH)] (3) in which one of the trimethylsilyl groups of 1 has been replaced by hydrogen. Another reaction in which the fragmentation of 1 occurs is that with the hydrate NiCl2·6H2O; in this case a square-planar nickel(II) complex of composition [Ni{Ph2PCH2PPh2(=NH)}2]Cl 1.25(NO3)0.75 (4) was identified as one of the products. The phosphonium salt [Ph2P(NH2)NPPh2(CH3)]I (5) is found to be a major product of the reaction between 3 and CO. The structures of 2-5 have been established by X-ray crystallography.
- Ganesan, Mani,Fanwick, Phillip E.,Walton, Richard A.
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p. 181 - 186
(2008/10/08)
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- Metal complexes of naphthyl-substituted thiourea derivatives
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The thiourea derivative N,N-diethyl-N′-2-naphthoylthiourea (1) and three N-(dialkylaminothiocarbonyl)-N′-(1-naphthyl)-arylamidines (2-4) have been synthesized and CuII-, NiII- and PdII-complexes of them have been prepared. According to the X-ray structure analyses 1 with CuII and NiII under deprotonation forms neutral bis-chelates of nearly square-planar coordination with a cis arrangement of the O and S ligator atoms. Using their N and S atoms in 1,3 position as ligators, 2-4 in deprotonated form coordinate to CuII and PdII as neutral bis-chelates, in the case of CuII with a distorted tetrahedral coordination. PdII is coordinated square planar and has, probably due to the spatial influence of the 1-naphthyl groups, a trans arrangement of the N and S ligator atoms.
- Schroeder, Uwe,Richter,Beyer,Angulo-Cornejo,Lino-Pacheco,Guillen
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p. 1051 - 1058
(2008/10/08)
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- Organic hole transporting and blue light emitting electroluminescent materials
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A tertiary amine imparted quaterphenyl compound represented by the following formula: where R1and R2, which can be different or the same, are hydrogen, C1-C5alkyl, or C6-C12aryl, and R3is hydrogen, C1-C5alkyl, a vinyl group, or an aryl vinyl group. The tertiary amine-imparted quaterphenyl compound exhibits good blue light luminescence and hole-transportability, and can be used in forming a hole-transporting layer, a blue light emitting layer, or a combined hole-transporting and light emitting layer of a light emitting organic electroluminescent device. Examples of the quaterphenyl compounds include N-quaterphenyl-4-yl-N,N-diphenylamine, N-(4′-(1,1-diphenylvinyl)quaterphenyl-4-yl)-N-phenyl-N-(m-tolyl)amine, or N-quaterphenyl-4-yl-N-phenyl-N-(m-tolyl)amine.
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- Chemical bond and hybridization in nickel compounds
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By means of ultraviolet reflectance and valence band photoemission one can get a scale of ionicity for nickel halides. The fraction of ionic character of the chemical bond, from 0.72 in NiI2 to 0.80 in NiCl2, evaluated with the Phillips theory has been related to the ground state d electron counts ?ndn? calculated from Ni2p core photoemission. While the chemical trends of cluster model parameters are in general well reproduced, a systematic discrepancy in band gap values (2-3 eV) has been found by comparing core-level results with optical and photoconductivity data.
- Pollini I.
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- Thermal and spectral studies of binary complexes of cyanodithioformate with transition metal ions
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Binary complexes of the type [M(S2CCN)2] (M = Mn2+, Fe2+, Co2+, Ni2+, Cu2+ and Zn2+) have been synthesised from alcoholic solutions. They have been characterised using elemental analyses, IR, UV-VIS spectroscopy, magnetic susceptibility measurement and solution conductance data. In thermogravimetry (TG) studies, all these complexes exhibit a prominent weight loss step between 100 and 330 °C under a N2 atmosphere. Besides, a second weight loss step has also been observed beyond 800° C for the Mn2+, Fe2+ and Co2+ complexes, between 400 and 600 °C for Zn2+ complex and beyond 380 °C for Cu2+ complex. Broad differential thermal analysis (DTA) endotherms are observed corresponding to these weight loss steps. The first weight loss in the TG scan of the complexes follows a deceleratiory α-time curve with D3 mechanism for all complexes. The activation energy (Ea) for the thermal decomposition varies between 43 and 115 kJ/mol and removal of CS2 and/or CS have been suggested. Various decomposition parameters have been calculated.
- Prasad, Rajendra,Kumar, Azad
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- Synthesis and reactivity of some mixed ligand complexes of Ni(II) involving dithiocarbamates and hard bases
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A few mixed ligand complexes of the general formula, [Ni(L)(DMG)] [where L=(H5C2)2NCS2- (dedtc-), (HOH4C2)NHCS2- (meadtc-), (HOH4C2)2NCS2- (deadtc-), H10C5NCS2- (pipdtc-), oxine(OX); DMG= dimethylglyoxime] have been synthesised and characterized by elemental analysis, IR, electronic spectra and thermogravimetric analysis.
- Rajendiran,Ramalingam,Thiruneelakandan
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p. 1101 - 1103
(2007/10/03)
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- Interaction of Nickel Oxide with Chlorine
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The interaction of nickel oxide with gaseous chlorine is studied from 200 to 850°C. The formation of nickel chloride begins at 350°C. Between 400 and 700°C, the process is accompanied by chlorine accumulation in the solid and is controlled by the growth of NiCl2 nuclei. The chlorination product, NiCl2, sublimes at temperatures above 750°C. The rate-controlling stage of chlorination is sublimation.
- Anufrieva,Derlyukova,Vinokurova
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- Synthesis, characterization and antifungal activity of nickel (II) complexes with cyclic phosphazenes
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Three organotriphosphazene ligands (L) have been synthesized by substituting the chlorine atoms of hexachlorocyclophosphazene with -NHC2H5, -NHCH2C6H5 or -OC2H5 Coordination comp
- Baranwal,Das,Farva
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p. 893 - 895
(2007/10/03)
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- Matrix isolation FTIR spectroscopic and density functional theoretical studies of the nickel, copper, and silver carbonyl chlorides
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The nickel, copper, and silver metal carbonyl chloride molecules have been prepared and isolated in solid argon by cocondensation of the species generated from 1064 nm laser ablation of metal chlorides with carbon monoxide in excess argon at 11 K. On the
- Shao, Limin,Zhang, Luning,Zhou, Mingfei,Qin, Qizong
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p. 1137 - 1143
(2008/10/08)
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- Highly efficient catalytic synthesis of α-amino acids under phase-transfer conditions with a novel catalyst/substrate pair
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A facile and fast enantioselective synthesis of α-amino acids with high ee values was achieved by the asymmetric alkylation of the glycine derivative 1 under phase-transfer conditions with (R)-2-amino-2′-hydrozy-1,1′-binaphthyl (NOBIN; see sceme). The ee value of the amino acid products. This occures as a results of a significant positive nonlinear effect in the alkylation reaction.
- Belokon, Yuri N.,Kochetkov, Konstantin A.,Churkina, Tatiana D.,Ikonnikov, Nikolai S.,Larionov, Oleg V.,Harutyunyan, Syuzanna R.,Vyskocil, Stepan,North, Michael,Kagan, Henri B.
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p. 1948 - 1951
(2007/10/03)
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- A practical asymmetric synthesis of enantiomerically pure 3-substituted pyroglutamic acids and related compounds
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DBU-catalyzed Michael addition reactions were shown to occur at room temperature between a nickel(II) complex of the Schiff base of glycine 1 and (S)- or (R)-N-(E-enoyl)-4-phenyl-3-oxazolidin-2-ones (2, see scheme). This reaction, which has an almost comp
- Soloshonok, Vadim A.,Cai, Chaozhong,Hruby, Victor J.
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p. 2172 - 2175
(2007/10/03)
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