127-09-3Relevant articles and documents
Synthesis and characterization of copper(II), iron(II), cobalt(II), nickel(II) and manganese(II) complexes of azido-1,4-bis(imidazol-1-YL-methyl)benzene (bix) or 1,4-bis(imidazol-1-YL-methyl)-2,5-dimethyl-benzene) (Mebix)
Shen, Hao-Yu,Liao, Dai-Zheng,Jiang, Zong-Hui,Yan, Shi-Ping,Wang, Geng-Lin
, p. 1331 - 1338 (1999)
Cu(II), Fe(II), Co(II), Ni(II), Mn(II) complexes of azido-1,4-bis(imidazol-1-yl-methyl)benzene (bix) or 1,4-bis(imidazol-1-yl-methyl)-2,5-dimethyl-benzene) (Mebix) were synthesized by the spontaneous self-assembly method. The compounds [Cu2(bix
A new, more efficient procedure for the preparation of potassium tris(malonto)cobaltate(III) dihydrate
Miodragovic, Zoran M.,Vuckovic, Gordana
, p. 1451 - 1461 (1999)
A new, very efficient and elegant procedure for the preparation of potassium tris(malonato)cobaltate(III) dihydrate, starting from Co(OH)3 and potassium hydrogenmalonate, is presented. The most important advantages of this procedure, in comparison to the previously reported ones, are: a relatively short time required, saving of the reagents and solvents, and a very good yield of pure product. The identification of the obtained complex was carried out by elemental analyses, electronic absorption and IR spectroscopy. The spectral data are in accordance with the previously reported literature data. Analogous procedure was also preliminary tested for the preparation of the corresponding tris(oxalato)-and tris(succinato)cobaltate(III). Finally, the described complex can be used as a starting material for the preparation of one mixed ligand Co(III) complex.
A polyoxometalate-assisted approach for synthesis of Pd nanoparticles on graphene nanosheets: Synergistic behaviour for enhanced electrocatalytic activity
Khadempir, Sara,Ahmadpour, Ali,Hamed Mosavian, Mohammad T.,Ashraf, Narges,Bamoharram, Fatemeh F.,Mitchell, Scott G.,De La Fuente, Jesús M.
, p. 24319 - 24326 (2015)
A polyoxometalate (POM) assisted approach has been employed to prepare a nanohybrid of Pd nanoparticles (PdNPs) and graphene nanosheets (GNSs). The Keggin-type POM, phosphomolybdic acid (PMo12), was applied to serve as both reducing and stabilising agent. The as-prepared nanohybrid (Pd/PMo12/GNSs) was comprehensively characterised using transmission electron microscopy and X-ray diffraction analysis. The synergistic behaviour of PdNPs, PMo12 and GNSs in the nanohybrid leads to elevated electrocatalytic property for ethanol oxidation. Moreover, the Pd/PMo12/GNSs nanohybrid was activated by applying a sufficiently negative potential which plays a key role in promoting the electrocatalytic activity. The activated catalyst presents a superior performance towards ethanol electrooxidation reaction and shows better tolerance to poisoning species compared to Pd and Pt nanoparticles. The outstanding electrocatalytic activity of the tri-component (Pd/PMo12/GNSs) nanohybrid is discussed with relevance to its application in direct alcohol fuel cells (DAFCs).
Efficient Iridium Catalysts for Formic Acid Dehydrogenation: Investigating the Electronic Effect on the Elementary β-Hydride Elimination and Hydrogen Formation Steps
Liu, Hong,Wang, Wan-Hui,Xiong, Huatian,Nijamudheen,Ertem, Mehmed Z.,Wang, Mei,Duan, Lele
, p. 3410 - 3417 (2021)
We report herein a series of Cp*Ir complexes containing a rigid 8-aminoquinolinesulfonamide moiety as highly efficient catalysts for the dehydrogenation of formic acid (FA). The complex [Cp*Ir(L)Cl] (HL = N-(quinolin-8-yl)benzenesulfonamide) displayed a high turnover frequency (TOF) of 2.97 × 104 h-1 and a good stability (>100 h) at 60 °C. Comparative studies of [Cp*Ir(L)Cl] with the rigid ligand and [Cp*Ir(L′)Cl] (HL′ = N-propylpypridine-2-sulfonamide) without the rigid aminoquinoline moiety demonstrated that the 8-aminoquinoline moiety could dramatically enhance the stability of the catalyst. The electron-donating ability of the N,N′-chelating ligand was tuned by functionalizing the phenyl group of the L ligand with OMe, Cl, and CF3 to have a systematical perturbation of the electronic structure of [Cp*Ir(L)Cl]. Experimental kinetic studies and density functional theory (DFT) calculations on this series of Cp*Ir complexes revealed that (i) the electron-donating groups enhance the hydrogen formation step while slowing down the β-hydride elimination and (ii) the electron-withdrawing groups display the opposite effect on these reaction steps, which in turn leads to lower optimum pH for catalytic activity compared to the electron-donating groups.
Synthesis and characterization of complexes of some hydroxyaryltellurium trichlorides with N-donor ligands
Verma,Dahiya, Reena,Soni, Daya
, p. 1033 - 1052 (1999)
Twenty new complexes of hydroxyaryltellurium trichlorides derived from isomeric cresols and ortho-chlorophenol with pyridine (Py), 2,2′-bipyridyl (Bipy) and piperidine (Pip) have been synthesized and characterized by elemental analyses, conductance, cryoscopy, infrared and proton magnetic resonance studies. Pyridine and piperidine form RTeCl3.L and RTeCl3.2L complexes, whereas 2,2′-bipyridyl which acts as a bidentate ligand and gives only RTeCl3.L complexes. Conductance and cryoscopic measurements reflect their weak or 1:1 electrolytic behaviour in solution of nitrobenzene, acetonitrile and acetone. Spectral studies indicate the linkage of these ligand molecules to the tellurium atom of the hydroxyaryltellurium group through nitrogen atoms. A square-pyramidal structure is suggested for RTeCl3.Py and RTeCl3.Pip, whereas 1:2 complexes of pyridine and piperidine along with RTeCl3.Bipy, have octahedral stereochemistry.
The selective oxidation of 1,2-propanediol to lactic acid using mild conditions and gold-based nanoparticulate catalysts
Ryabenkova, Yulia,He, Qian,Miedziak, Peter J.,Dummer, Nicholas F.,Taylor, Stuart H.,Carley, Albert F.,Morgan, David J.,Dimitratos, Nikolaos,Willock, David J.,Bethell, Donald,Knight, David W.,Chadwick, David,Kiely, Christopher J.,Hutchings, Graham J.
, p. 139 - 145 (2013)
The use of bio-renewable resources for the generation of materials and chemicals continues to attract significant research attention. It is well established that glycerol is an excellent starting material for the production of 1,2-propanediol by dehydration/hydrogenation and that this can subsequently be oxidised to lactic acid, which has the potential to be used as a major chemical in the production of biodegradable polymers. Previous studies using gold catalysts for the oxidation of 1,2-propanediol have used elevated temperatures and pressures. We now show that the oxidation of 1,2-propanediol to form lactic acid can be carried out selectively under mild reaction conditions with gold-platinum catalysts prepared using a sol-immobilisation method, with activated carbon as the support. Carrying out the reaction at ambient temperature with air significantly improves the reaction in terms of its environmental impact and its industrial attractiveness, as lactic acid can be obtained with high selectivity.
Interaction of cobalt(II) and copper(II) with polyoxometallates. Structure of Na3Co[IMo6O24]. 14H2O
Rosu, Cristina,Gomez-Garcia, Carlos Jose,Dickman, Michael H.,Rusu, Mariana
, p. 1123 - 1131 (1999)
Cobalt(II) and copper(II) complexes with the ligand anion [IMo6O24]5- (periodate 6-molybdoanion) of the general formula Na3M[IMo6O24].nH2O (where M = Co, Cu) have been prepared by the reaction of the corresponding metal salts with the ligand in aqueous media (pH = 6). The complexes were characterised by elemental and thermogravimetric analyses, spectral data (IR, UV-vis). The EPR spectrum of a copper(II) powder sample was recorded at both room temperature and 12 K indicating a weakly distorted octahedral copper(II) stereochemistry. The crystal structure of Na3CO[IMo6O24]. 14H2O has been determined by single-crystal X-ray diffraction technique.
Fluorescent monitoring of the reaction kinetics of nonfluorescent molecules enabled by a fluorescent receptor
Bai, Lin-Ming,Zhou, Hang,Liu, Wei-Er,Chai, Hongxin,Yang, Liu-Pan,Yan, Wei,Zhang, Wen,Yang, Hong-Hui,Jiang, Wei
, p. 3128 - 3131 (2019)
A facile fluorescent method was developed to quantitatively monitor the hydrolysis kinetics of nonfluorescent esters by using a fluorecent endo-functionalized molecular tube and its recognition ability towards small polar molecules in water. It is possible to determine the apparent rate constants and study the structure-activity relationship.
In situ FTIR spectroscopic studies of electrooxidation of ethanol on Pd electrode in alkaline media
Zhou, Zhi-You,Wang, Qiang,Lin, Jian-Long,Tian, Na,Sun, Shi-Gang
, p. 7995 - 7999 (2010)
Electrooxidation of ethanol on a polycrystalline Pd disk electrode in alkaline media was studied by in situ Fourier transform infrared (FTIR) reflection spectroscopy. The emphasis was put on the quantitative determination of intermediates and products involved in the oxidation. It has revealed that most of ethanol was incompletely oxidized to acetate. The selectivity for ethanol oxidation to CO2 (existing as CO32- in alkaline media) was determined as low as 2.5% in the potential region where Pd electrode exhibited considerable electrocatalytic activity (-0.60 to 0.0 V vs. SCE). Nevertheless, the ability of Pd for breaking C-C bond in ethanol is still slightly better than that of Pt under the same conditions. Besides, a very weak band of adsorbed intermediate, bridge-bonded CO (COB) was identified on the Pd electrode for the first time, suggesting that CO2 and CO32- species may also be generated through CO pathway (i.e., indirect pathway).
Selective formation of lactate by oxidation of 1,2-propanediol using gold palladium alloy supported nanocrystals
Dimitratos, Nikolaos,Lopez-Sanchez, Jose Antonio,Meenakshisundaram, Sankar,Anthonykutty, Jinto Manjaly,Brett, Gemma,Carley, Albert F.,Taylor, Stuart H.,Knight, David W.,Hutchings, Graham J.
, p. 1209 - 1216 (2009)
The use of bio-renewable resources, such as glycerol, a by-product from bio-diesel manufacture, can provide a viable way to make valuable products using greener technology. In particular, glycerol can be reduced to give 1,2-propanediol that can then be se
