cas 3094-87-9, Ferrous acetate | Articles data

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Gold-Clip-Assisted Self-Assembly and Proton-Coupled Expansion–Contraction of a Cofacial FeIII–Porphyrin Cage
A molecular cage {Au8(μ-PAnP)4[Fe(H2O)2(TPyP)]2(OTf)2}(OTf)8 (1) composed of two cofacial FeIII-porphyrin can be self-assembled from the gold clip [Au2(PAnP)Cl2] and Fe3+(H2O)2(TPyP)+ (PAnP=9,10-bis(diphenylphosphino)anthracene, TPyP=meso-tetra(4-pyridyl)porphyrinato). The height of the cage is 8.579(3) ?. The addition of a base to a solution of the cage leads to a contracted and twisted cage {[Au8(μ-PAnP)4[Fe2(μ-O)(TPyP)2]}(OTf)8 (2), which has a height of ≈4.4 ? and porphyrin–porphyrin torsional angle of ≈20°. The contracted cage can be synthesized independently from the gold clip and Fe2(μ-O)(TPyP)2. The spectroscopy and crystal structure of an unclipped analog of the contracted cage, {[AuPPh3)8[Fe2(μ-O)(TPyP)2]}(OTf)8 (3), supports the DFT-calculated structure of 2. NMR and UV/Vis titrations show that the expansion-untwisting and contraction-twisting of the cage is reversible.
Wang, Yuanyuan,Ang, Pau Lin,Wong, Chun-Yuen,Yip, John H. K.
supporting information
p. 18623 - 18628
(2018/11/23)

A study of the effect of pyridine linkers on the viscosity and electrochromic properties of metallo-supramolecular coordination polymers
We present the optical, electrochemical, and electrochromic properties of Fe(ii)-, Co(ii)- and Ru(ii)-based metallo-supramolecular polymers (MEPEs) self-assembled from rigid, π-conjugated bis-terpyridines with different numbers of pyridine linkers. By exc
Pai, Sandesh,Schott, Marco,Niklaus, Lukas,Posset, Uwe,Kurth, Dirk G.
p. 3310 - 3321
(2018/04/05)

The Kinetics of Growth of Metallo-supramolecular Polyelectrolytes in Solution
Several transition metal ions, like Fe2+, Co2+, Ni2+, and Zn2+ complex to the ditopic ligand 1,4-bis(2,2′:6′,2′′-terpyridin-4′-yl)benzene (L). Due to the high association constant, metal-ion induced self-assembly of Fe2+, Co2+, and Ni2+ leads to extended, rigid-rod like metallo-supramolecular coordination polyelectrolytes (MEPEs) even in aqueous solution. Here, we present the kinetics of growth of MEPEs. The species in solutions are analyzed by light scattering, viscometry and cryogenic transmission electron microscopy (cryo-TEM). At near-stoichiometric amounts of the reactants, we obtained high molar masses, which follow the order Ni-MEPE≈Co-MEPEa reversible step-growth mechanism. The forward polymerization rate constants follow the order Co-MEPEFe-MEPENi-MEPE and the growth of MEPEs can be accelerated by adding potassium acetate.
Munzert, Stefanie Martina,Stier, Simon P.,Schwarz, Guntram,Weissman, Haim,Rybtchinski, Boris,Kurth, Dirk G.
p. 2898 - 2912
(2017/10/06)

Green-to-Red Electrochromic Fe(II) Metallo-Supramolecular Polyelectrolytes Self-Assembled from Fluorescent 2,6-Bis(2-pyridyl)pyrimidine Bithiophene
The structure and properties of metallo-supramolecular polyelectrolytes (MEPEs) self-assembled from rigid 2,6-bis(2-pyridyl)pyrimidine and the metal ions FeII and CoII are presented. While FeL1-MEPE (L1 = 1,4-bis[2,6-bis(2-pyridyl)pyrimidin-4-yl]benzene) is deep blue, FeL2- and CoL2-MEPE (L2 = 5,5′-bis[2,6-bis(2-pyridyl)pyrimidin-4-yl]-2,2′-bithiophene) are intense green and red in color, respectively. These novel MEPEs display a high extinction coefficient and solvatochromism. Ligand L2 shows a high absolute fluorescence quantum yield (Φf = 82%). Viscosity and static light-scattering measurements reveal that the molar masses of these MEPEs are in the range of 1 × 108 g/mol under the current experimental conditions. In water, FeL1-MEPE forms a viscous gel at 20 °C (c = 8 mM). Thin films of high optical quality are fabricated by dip coating on transparent conducting indium tin oxide (ITO) glass substrate. Optical, electrochemical, and electrochromic properties of the obtained MEPEs are presented. Green to red and blue to colorless electrochromism is observed for FeL2-MEPE and FeL1-MEPE, respectively. The results show that the electrochromic properties are affected by the ligand topology. The Fe-MEPEs show a reversible redox behavior of the FeII/FeIII couple at 0.86 and 0.82 V versus Fc+/Fc and display an excellent redox cycle stability under switching conditions. FeL2-MEPE in its oxidized state exhibits a broad absorption band covering the near-IR region (ca. 1500 nm) due to the ligand-to-metal charge transfer transition originating due to charge delocalization in the bithiophene spacer.
Pai, Sandesh,Moos, Michael,Schreck, Maximilian H.,Lambert, Christoph,Kurth, Dirk G.
p. 1418 - 1432
(2017/02/15)

METHOD FOR PRODUCING IRON CARBONATE
The purpose of the present invention is to provide a method for producing an iron carbonate, whereby it becomes possible to prevent the generation of hydrogen during the production of the iron carbonate by the reaction of a carboxylic acid with metal iron. An embodiment of the present invention is a method for producing an iron carbonate by reacting metal iron with a carboxylic acid in a reaction solution, wherein a compound of trivalent iron is added to the reaction solution, the reaction solution contains a compound of trivalent iron at the time of the start of the reaction, the reaction solution contains a non-iron metal having a standard electrode potential of -2.5 to 0.1 inclusive or a metal compound containing the metal, or the reaction solution contains at least one metal selected from the group consisting of Ag, Bi and Pd or a metal compound containing the metal.
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Paragraph 0077; 0078; 0087; 0088

(2015/07/15)

MAGNETITE IN NANOPARTICULATE FORM
The present invention relates to a process for the polyol-type synthesis of nanoparticulate magnetite starting from mixtures of Fe0 and FeIII in the presence of a mineral acid. The magnetite particles obtainable from the process have uniform size characteristics and have even presented higher SAR (Specific Absorption Rate) values than those of magnetosomes.
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Paragraph 0066-0069

(2015/11/23)

Colloidal synthesis of ultrathin γ-Fe2O3 nanoplates
A facile method of synthesizing γ-Fe2O3 ultrathin nanoplates has been developed. These nanoplates are single crystalline and superparamagnetic at room temperature, with a thickness of only 1.4 nm. FTIR analysis has shown that the coordination mode between Fe and carboxyl group is dominated by bidentate configuration in the as prepared iron oleate complex, which is the key for producing the nanoplate morphology. By changing the reaction temperatures, the lateral size and thickness of nanoplates can be varied.
Ding, Xiangui,Bao, Liu,Jiang, Jiang,Gu, Hongwei
p. 9314 - 9320
(2014/03/21)

Practical syntheses of N-acetyl (E)-β-arylenamides
A facile and practical method for the preparation of (E)-β- arylenamides [(E)-N-(1-arylprop-1-en-2-yl]acetamides] has been developed by reductive acetylation of the corresponding oximes with iron(II) acetate as the reducing reagent. Employment of hexamethylphosphoramide as the solvent was found to be critical for the high E/Z selectivity. The methodology has been applied in efficient syntheses of a key chiral intermediate of tamsulosin by asymmetric hydrogenation. Georg Thieme Verlag Stuttgart . New York.
Cai, Zhihua,Liu, Guodu,Jiao, Guangjun,Senanayake, Chris H.,Tang, Wenjun
p. 3355 - 3360
(2014/01/06)

Crystal structure of iron(II) acetate
In this paper the X-ray structure and magnetic properties of iron(II) acetate - starting material for the synthesis of a wide range of iron complexes - are presented. The compound crystallises in the space group Pbcn and was identified as 2D coordination polymer consisting of iron atoms and acetate moieties with all the iron atoms hexacoordinate and different coordination modes for the acetate moieties. Additional hydrogen bond contacts lead to a porous coordination polymer with 1D channels in the size of mesopores. Temperature dependent magnetic measurements confirm that the complex is a high-spin compound in the entire temperature range investigated with a room temperature magnetic moment of 5.4 μB. Field-dependent magnetisation measurements reveal a slightly sigmoidal curve progression typical for metamagnetism. Copyright
Weber, Birgit,Betz, Richard,Bauer, Wolfgang,Schlamp, Stephan
p. 102 - 107
(2011/03/19)

REDUCIBLE POROUS CRYSTALLINE HYBRID SOLID FOR THE SEPARATION OF MIXTURES OF MOLECULES HAVING DIFFERENT DEGREES AND/OR A DIFFERENT NUMBER OF UNSATURATIONS
The present invention relates to reducible porous crystalline solids, constituted of a metal-organic framework (MOF), for the separation of mixtures of molecules having different unsaturation degrees and/or a different number of unsaturations with a selectivity that can be adjusted by controlling the reduction of the MOF. The MOF solids of the present invention, after reduction, have a strong affinity for molecules containing at least one unsaturation. They can be used in various separation processes, especially those relating to hydrocarbons.
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(2011/08/03)

ORGANIC/INORGANIC HYBRID NANOPARTICULATES MADE FROM IRON CARBOXYLATES
The invention relates to nanoparticles made from organometallic hybrid materials made from iron carboxylates, used for example as contrast agents. The particles can also be used for the encapsulation and vectoring of molecules of interest such as active3 pharmaceutical agents, cosmetically interesting compounds and markers. Apart from the intrinsic properties thereof for imaging, said nanoparticles give good results in terms of capacity for loading with medicaments and in biocompatibility.
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(2010/08/22)

Structure-function mimicry of oxidized purple acid phosphatase-PAP ox-A new functional model
Electronic structure and spectroscopic properties of the novel diiron active site of oxidized mammalian purple acid phosphatase analogues, Fe-6: [Fe2 (μ-O) (μ-OAc) (4HNSQox)-(ONSQ ox)2-(H2O)4] and Fe-7: [Fe2 (μ-O) (μ-OAc) (ONSQox)2-(OAc) (H2O)4] are described. Magnetic susceptibility SQUID data of Fe-6 are best fitted to Heisenberg's isotropic spin pair (S = 5/2, 3/2) model using magnetic parameters g = 2 and J = - 36.8 cm-1 with R factor = 6.4 × 10-4. The antiferromagnetic exchange establishes Fe(III) -0-Fe(III) dimeric core with Fe(III) site having two radical ligations in the naphthosemiquinone oxime form of lawsone oxime. In the model compound Fe-7 of oxidized purple acid phosphatase, bridged and terminal acetate functions are identified according to their different energies of activations, i.e, ～34 and 58 kJ mol-1 respectively. Also, the reduced naphthoquinone oxime form of ligand is characterized by its energy of activation (-15 kJ mol-1) from pyrolytic reaction. Mossbauer parameters, 8 = 0.4 mm s-1 and AEQ = 0.8 mm s-1, are characteristics of oxidized Fe(III) in high spin octahedral site. Only Fe-6 shows analogous physiological DNA cleavage activity on pUC19 plasmid and acts as a good model of oxidized purple acid phosphatase enzyme.
Waghmode, Shobha A.,Date, Sadgopal K.,Gupta, Vidya S.,Rane, Sandhya Y.
p. 1023 - 1029
(2011/01/11)

Studies on initial permeability and loss factor in Ni-Zn ferrites synthesized by oxalate precursors
NiXZn1-XFe2O4 ferrites with (X = 0.28-0.40 in step of 0.2) have been synthesized by oxalate precursor method and investigated for their, initial permeability and loss factor measurements. Initial permeability has been observed to increase with the increase in Ni 2+ up to X = 0.32, beyond which it decreases. The variation of initial permeability has been explained by considering the factors such as grain size, saturation magnetization and anisotropy constant. Thermal variation of initial permeability reveals a peak height in μi-T curves which tends to increase with increase in Ni2+ content. μi-T curves also exhibit thermal hysteresis, which reveals the inverse relationship between the difference in heating and cooling curves at which hysteresis falls between Hopkinson peak and Tc with value of initial permeability. Loss factor values are small which is attributed to high density of the samples and processing techniques.
Chaudhari,Kambale,Patil,Sawant,Suryavanshi
p. 1713 - 1719
(2011/01/06)

NOVEL PROCESS FOR THE PREPARATION OF IRON SUCROSE COMPLEX
The present invention provides a novel reproducible method for the preparation of Iron sucrose complex using ferric acetate that is prepared freshly from ferric hydroxide. This method affords iron sucrose complex in a powder form and an injectable form.
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(2009/07/18)

Electric properties of Co substituted Ni-Zn ferrites
Nanocrystalline Ni-Co-Zn ferrites have been synthesized by chemical co precipitation method, using oxalate precursors. The phase formation of the sintered ferrite was confirmed by X-ray diffraction study. The lattice parameter 'a' increases with the addit
Ghodake,Kambale,Salvi,Sawant,Suryavanshi
p. 830 - 834
(2010/03/05)

PREPARATION OF IRON (II) ACETATE POWDER FROM A LOW GRADE MAGNETITE
The present invention relates to a preparation of iron(II) acetate powder from low grade magnetite and comprises the following steps: (a) adding organic acid to low grade magnetite powder to obtain iron solution; (b) adding hydroxide to the iron solution to obtain iron hydroxide; and (c) adding acetic acid to the iron hydroxide, thereby obtaining iron(II) acetate. According to the present invention, it is possible to obtain high purity iron(II) acetate using low grade magnetite and there are advantages of mass producible environmentally-friendly simple process and prevention of corrosion of facilities.
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(2009/05/29)

Antioxidants for preventing and treating diseases caused by oxidative stress
Antioxidant compositions for the treatment and prophylaxis of illnesses associated with oxidative stress and lack of oxygen in the human body, comprising a complex of a metal selected from the group consisting of iron, copper, zinc and manganese with rutin and ascorbic acid and/or dihydroascorbic acid. Methods for synthesizing the antioxidant compositions and granulates, tablets and capsules containing antioxidant compositions are also provided.
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(2009/07/17)

On the thermal stability of Co2Z hexagonal ferrites for low-temperature ceramic cofiring technologies
Co2Z hexaferrite Ba3Co2Fe24O41 was prepared by a mixed oxalate co-precipitation route and the standard ceramic technology. XRD studies show that at T2Z-type ferrite of about μ=20 is stable up to several 100 MHz, with maximum losses μ′′ around 700 MHz. Addition of 3 wt% Bi2O3 as sintering aid shifts the temperature of maximum shrinkage down to 950 °C and enables sintering of Z-type ferrite powders at 950 °C. However, the permeability is reduced to μ=3. It is shown here for the first time that Co2Z ferrite is not stable under these conditions; partial thermal decomposition into other hexagonal ferrites is found by XRD studies. This is accompanied by a significant decrease of permeability. This shows that Co2Z hexagonal ferrite is not suitable for the fabrication of multilayer inductors for high-frequency applications via the low-temperature ceramic cofiring technology since the material is not compatible with the typical process cofiring temperature of 950 °C.
Kra?unovska,T?pfer
p. 1370 - 1376
(2008/10/09)

Synthesis and reactivity of haloacetato derivatives of iron(II) including the crystal and the molecular structure of [Fe(CF3COOH) 2(μ-CF3COO)2]n
The syntheses of haloacetates of iron(II) and their reactivity are described. The compound Fe(CF3COO)2, 1, crystallizes from CF3COOH/(CF3CO)2O solution as the polynuclear [Fe(CF3COO)2(CF3COOH)2] n, 2, which contains bridging trifluoroacetates and monodentate trifluoroacetic acid groups. Fe(CF3COO)2(DMF)x, as obtained from Fe(CO)5 and CF3COOH/(CF 3CO)2O in DMF, reacts with dioxygen at room temperature to give two μ3-oxo compounds, namely, [Fe3(μ 3-O)(CF3COO)6(DMF)3], 3, a Fe (II)-Fe(III)-Fe(III) derivative, and [Fe 4(μ3-O)2(μ2-CF 3COO)6(CF3COO)2(DMF)4], 4, containing Fe(III) atoms only, which have been characterized by X-ray diffraction methods. Iron(II) chloro- and bromoacetates can be isolated by exchange reactions of iron(II) acetate with chloro- and bromo-substituted acetic acids in moderate to good yields. The stability of iron(II) haloacetates decreases on increasing the atomic weight and the number of halogens on the α-carbon atom. The species Fe(CX3COO)2 (X = Cl, 7; Br, 8), in THF solution, slowly convert into [Fe3(μ3-O) (CCl3COO)6(THF)3], 11, or [Fe 3(μ3-O)(CBr3COO)6(THF) 3][FeBr4], 10, respectively. Likewise, when iron(II) acetate (or trifluoroacetate) is left for several hours in the presence of a variety of haloacetic acids in THF, selective formation of different species, depending on the nature of the starting compound and of the acid employed, is observed. The formation of these products is the result of C-X bond activation (X = Cl, Br) and haloacetato decomposition, which occurs with concomitant oxidation at the metal centers. Carboxylic acid degradation species (CH 2XCOOH, CX4, CX3H, CX2H2, X = Cl, Br) have been observed by GC-MS.
Marchetti, Fabio,Melai, Bernardo,Pampaloni, Guido,Zacchini, Stefano
p. 3378 - 3384
(2008/10/09)

Magnetic properties of NiCuZn ferrites synthesized by oxalate precursor method
Ni-Cu-Zn ferrites have been synthesized by employing co-precipitation technique using oxalate precursors. X-ray diffractograms did not show impurity phases, indicating single-phase formation of the ferrites. The diffractograms of oxalate complex decomposed at 650 °C show that ferritization is complete up to 650 °C. Lattice parameter a (A?) was found to decrease with the addition of Ni2+ which is attributed to ionic sizes of Ni2+ (0.69 A?), which replaces Cu2+ (0.72 A?). From the thermogravimetric studies it is observed that the experimentally observed total mass loss (%), agrees with theoretically calculated mass loss (%) indicating maintenance of requisite stoichiometry. Initial permeability (μi ) shows increase when Ni2+ is added up to x = 0.15 while for (x > 0.15), it decreases. The increase in initial permeability (μi) is attributed to monotonic increase in Ms, and K1 on addition of Ni2+. However, the microstructure and density (porosity) also influence μi variations. The decrease in μi is attributable to increase of K1. The composition with density 91.14% exhibits large μi which also tends to increase with temperature up to 60 °C. Thus its usable range extends up to 60 °C. This samples has Tc near to 160 °C.
Ghodake,Ghodake,Sawant,Suryavanshi,Bakare
p. 110 - 119
(2008/10/09)

Thermal decomposition of freeze-dried μ-oxo-carboxylates of manganese and iron
The decomposition of freeze-dried mixed carboxylates of manganese and iron was investigated by means of DTA, TG, mass spectroscopy and X-ray powder diffractometry. The three main steps of decomposition are characterized as release of (a) H2O, (b) carboxylic acid and CO2/CO, and (c) the corresponding carbonyl compound and CO2. In particular, the course of process (b) strongly depends on the stability of the metal-carboxylate link in the three investigated carboxylates. Well-crystallized single-phase manganese ferrites can be obtained on decomposition of formates of appropriate composition and thermal treatment of decomposition products at 600°C while maintaining a p(O2) within the coexistence field of manganese ferrite.
Langbein,Christen,Bonsdorf
p. 173 - 180
(2008/10/09)

Thermochemical reactivity of transition metal acetates and of a novel DMSO solvate of iron(II) acetate in molecular hydrogen
The thermal decomposition of acetates of the transition metals Fe, Co, Ni, Mn and Cu in molecular hydrogen has been investigated by means of combined thermogravimetry/mass spectrometry, X-ray diffraction, and transmission as well as scanning electron microscopy. In the context of the reproducible preparation of the parent phases, i.e. the hydrated or anhydrous metal(II) acetates, single crystalline Fe3(CH3COO)6(DMSO)2, a novel DMSO solvate of iron(II) acetate, has been isolated and its crystal structure has been determined by means of X-ray diffraction. For the series of metal(II) acetates it has been found that the course of the thermal degradation in molecular hydrogen, in particular the formation of the gaseous products, strongly depends on the transition metal ion present in the parent compound. The detailed characterization of the solid products revealed, that phases exhibiting different catalytic activities and selectivities are formed as micro- or nanocrystalline metals and/or metal oxides.
Ehrensberger,Schmalle,Oswald,Reller
p. 139 - 149
(2008/10/09)

Thermoanalytical study of Cu-Mg-Zn ferrites
Homogeneous solid solution oxalates of Fe2+, Cu2+, Mg2+ and Zn2+ metals were prepared by co-precipitation from respective metal acetate solutions with oxalic acid solution. The thermogravimetric (TG) analysis of
Bhosale,Choudhari,Sawant,Patil,Kulkarni,Kelkar
p. 851 - 859
(2008/10/08)

Thermal study of ferritization temperature of Cu-Mg-Zn ferrites: TG/DTG/DTA (STA) studies
Oxalates of Cu2+, Mg2+, Zn2+ and Fe2+ were coprecipitated from the mixture of respective acetate solutions using 0.6 M oxalic acid solution to form a homogeneous solid solution MgxCu(0.5-x)Zn0.5Fe2 (C2O4)3·nH2O with x=0.00, 0.20, 0.25 and 0.40. To determine ferritization (formation of ferrite) temperature of resulting ferrite system, MgxCu(0.5-x)Zn0.5Fe2O4 with x=0.00, 0.20, 0.25 and 0.40, TG/DTG/DTA studies (STA) were carried out on coprecipitated oxalate complexes. These studies revealed the low ferritization temperature (326°-370°C) of the ferrite system and occurrence of simultaneous decomposition and ferritization processes. The ferrite system was characterized using X-ray diffraction study, which revealed the presence of single spinel phase.
Bhosale,Patil,Rane,Mahajan,Bakare,Sawant
p. 159 - 165
(2008/10/09)

Synthesis, characterization and thermal analysis of [Fe(N2H4)2(CH3COO)2]
[Fe(N2H4)2(CH3COO)2] was synthesized and characterized for the first time by chemical analysis, magnetic measurements, electronic and IR spectral studies. Its thermal reactivity was ascertained by the
Jiji, E. R.,Aravindakshan, K. K.
p. 65 - 72
(2008/10/08)

Photoinduced electron transfer in self-associated complexes of several uroporphyrins and cytochrome c
Photoinduced electron transfer between cytochrome c and free base and metallouroporphyrin (Up, MUp) has been studied. Difference absorption spectrophotometry showed that the electrostatic interactions between Up and cytc(III) result in their forming a self-associated 1:1 complex in the ground state with a binding constant that depends upon the ionic strength. In the complex, the photoexcited uroporphyrin singlet state was quenched through a static interaction with the protein. Even under the most favorable quenching conditions, i.e., when all porphyrin was complexed, residual fluorescence was noted. More significantly the excited singlet state of the complex was shown to undergo small, but significant, intersystem crossing. These triplet states rapidly underwent an electron-transfer process that yielded transiently the Fe(II) form of the protein. This is the first observation of such a process from a porphyrin/cytochrome self-association complex. Both the rates of bimolecular electron transfer between uncomplexed partners and intramolecular electron transfer from the uroporphyrin triplet to cytochrome c, as well as the thermal intramolecular back-reaction, have been measured by transient kinetic spectroscopy. The rate constants of intramolecular electron transfer for zinc uroporphyrin/cytochrome c and zinc cytochrome c/ferriuroporphyrin have been also determined. These three couples allow us to estimate approximately the reorganization energy λ in the semiclassical electron-transfer theory.
Zhou,Granada,Leontis,Rodgers
p. 5074 - 5080
(2007/10/02)

13C and 17O NMR and IR spectroscopic study of a series of carbonyl(4-substituted pyridine)(meso-tetraphenylporphinato)iron(II) complexes. Correlations between NMR chemical shifts and IR stretching frequencies of the carbonyl ligand and taft parameters of the pyridine substituent
The results of a 13C and 17O NMR and IR spectroscopic study of a series of carbonyl(4-substituted pyridine) (meso-tetraphenylporphinato)iron(II) (Fe(TPP)(CO)(py-4-X)) complexes are presented. Good to excellent linear correlations between the 13C and 17O NMR chemical shifts and the IR stretching frequencies of the carbonyl ligand are observed as the pyridine substituent is varied. Good to excellent linear correlations are also observed between these NMR chemical shifts and IR stretching frequencies and the NMR chemical shifts and IR stretching force constants for the trans carbonyls of a series of cis-Mo(CO)4(py-4-X)2 complexes as the pyridine substituent is varied. The relationship between the donor ability of the pyridine ligands and the 13C and 17O NMR chemical shifts and IR stretching frequencies of the carbonyl ligands in the Fe(TPP)(CO)(py-4-X) complexes has been quantitated by fitting the spectroscopic data to the single and the dual Taft substituent parameters of the pyridine substituent. Good to excellent correlations are observed. The upfield shift in the 13C NMR resonance of the carbonyl ligand as the electron-donor ability of the pyridine increases is unique. This has been rationalized by using the Buchner and Schenk description of metal carbonyl 13C NMR chemical shifts.
Box, James W.,Gray, Gary M.
p. 2774 - 2778
(2008/10/08)

Iron benzoquinone dioxime complexes. Electronic effects on axial ligation to ferrous dioximes
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Pomposo, Frank,Stynes, Dennis V.
p. 569 - 571
(2008/10/08)

Method for the preparation of metal salts of phosphorus acid esters
Method for preparing metal salts of phosphorus acid esters comprising reacting metal salts of organic acids with phosphorus acid esters. By-product removal is facilitated such that high purity products are produced. Products are particularly useful as support materials in the preparation of highly active alpha-olefin polymerization catalyst components.
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(2008/06/13)