PH- and mol-ratio dependent tungsten(VI) - citrate speciation from aqueous solutions: syntheses, spectroscopic properties and crystal structures

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	PH- and mol-ratio dependent tungsten(VI) - citrate speciation from aqueous solutions: syntheses, spectroscopic properties and crystal structures
	Zhang, H. ; Zhao, H. ; Jiang, Y. Q. ; Hou, S. Y. ; Zhou, Z. H. ; Wan, H. L. ; Wan HL(万惠霖)
刊名	http://dx.doi.org/10.1016/S0020-1693(03)00177-4
	2003-07-22
关键词	CITRIC-ACID MOFE-PROTEIN COMPLEX NITROGENASE LIGAND OXOTUNGSTATE(VI) MOLYBDENUM CATALYSTS COFACTOR ALLOYS
英文摘要	Investigation of the aqueous coordination chemistry for citrate and tungsten(VI) resulted in the isolation of three new monomeric and dimeric tunesten(VI) citrate NaK3[W2O5(Hcit)(2)].4H(2)O (1), (Hphen)(3)[WO2(H(2)cit)(Hcit)].6H(2)O (2) and K-4[WO3(cit)].2H(2)O (3), (H(4)cit=citric acid). The three complexes have been characterized by elemental analyses, IR and NMR spectroscopies. The IR and NMR spectra are consistent with monomeric species or a monooxo-bridged dinuclear structure as revealed by single crystal X-ray diffraction study. The dimeric anion of complex 1 contains a bent (O2W)O(WO2) core with an angle of W-Ob-W 162.3(3)degrees. Each citrate ligand is tridentately coordinated to one tungsten atom through the alpha-alkoxyl, alpha-carboxyl, and one beta-carboxyl group, making each metal atom six-coordinate and forming a mesomer with configuration of Delta(S)Lambda(R). The mononuclear tungstate 2 consists of a cisdioxo partially protonated citrato tungstate(VI) anion and three phenanthrolinium cations. The W(VI) atom is coordinated by two acid oxo groups and two bidentate citrate ligands through alpha-alkoxyl and alpha-carboxyl groups, while the other two beta-carboxyl or carboxylic groups remain free. The tungsten atom in the complex 3 forms an octahedral coordination with three fac-oxo groups and one tridentate citrate. in which the later is coordinated through the alpha-alkoxyl and alpha-carboxyl groups, and much more weakly by one of the two terminal beta-carboxyl groups [2.348(4) Angstrom]. Interconversion of citrato tungstate(VI) with pH value and the molar ratio of the reactant are discussed. (C) 2003 Elsevier Science B.V. All rights reserved.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/61069]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Zhang, H.,Zhao, H.,Jiang, Y. Q.,et al. PH- and mol-ratio dependent tungsten(VI) - citrate speciation from aqueous solutions: syntheses, spectroscopic properties and crystal structures[J]. http://dx.doi.org/10.1016/S0020-1693(03)00177-4,2003.
APA	Zhang, H..,Zhao, H..,Jiang, Y. Q..,Hou, S. Y..,Zhou, Z. H..,...&万惠霖.(2003).PH- and mol-ratio dependent tungsten(VI) - citrate speciation from aqueous solutions: syntheses, spectroscopic properties and crystal structures.http://dx.doi.org/10.1016/S0020-1693(03)00177-4.
MLA	Zhang, H.,et al."PH- and mol-ratio dependent tungsten(VI) - citrate speciation from aqueous solutions: syntheses, spectroscopic properties and crystal structures".http://dx.doi.org/10.1016/S0020-1693(03)00177-4 (2003).