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	Solid and solution structural studies of dimeric and tetrameric molybdenum(VI) malate complexes
	Zhang, Rong-Hua ; Zhang RH(张荣华) ; Zhou, Zhao-Hui ; Zhou CH(周朝晖) ; Wan, Hui-Lin ; Wan HL(万惠霖)
	2008
关键词	molybdate(VI) malate nitrogenase crystal structure NMR
英文摘要	Reactions of potassium molybdate with racemic malic acid (H(3)mal = C4H6O5) result in the isolation of two mesomeric molybdenum malate complexes K-8[(MoO2)(2)O(R-mal)(2)][(MoO2)(2)O(S-mal)(2)]center dot 4H(2)O 1 and (HiM)(2)K-6[(MoO2)(4)O-3(R-mal)(2)][(MoO2)(4)O-3(S-mal)(2)]center dot 8H(2)O 2. Complex 1 belongs to the monoclinic system, space group C2/c with a 14.8637(3), b = 6.9544(1), c = 19.6783(5) angstrom, beta = 100.08](2)degrees, V = 2002.70(7) angstrom(3), M-r = 1452.88, Z = 2, F(000) = 1416, T = 173 K, D-c = 2.409 g/cm(3), mu(MoK alpha) = 2.167, R = 0.0283 and wR = 0.0733. 2 is of triclinic system, space group P (1) over bar with a = 8.7707(2), b = 9.3310(3), c = 17.9093(7) angstrom, alpha = 83.781(3), beta = 85.626(2), gamma = 84.822(2)degrees, V = 1447.84(8) angstrom(3), M-r = 2160.68, Z = 1, F(000) = 1048, T = 173 K, D-c = 2.478 g/cm(3), mu(MoK alpha) = 2.230, R = 0.0234 and wR = 0.0584. 1 is the first isolated dinuclear molybdenum(VI) malato complex in 1: 1 molar ratio. The molybdenum atoms in the two complexes are six-coordinated in an approximately octahedral geometry. Two malates coordinate tridentately with the Mo atom via their alpha-alkoxy, alpha-carboxy and alpha-carboxy groups in 1and 2. beta-Carboxy group in 2 further links with the other two Mo atoms to give a tetrameric unit. The solution I H and C-13 NMR spectra indicate that dimeric malate molybdenum in I dissociates partly in solution and exists in an equilibrium with tetrameric species, while 2 is stable and retains its tetrameric structure without any dissociation.
语种	英语
出版者	CHINESE JOURNAL STRUCTURAL CHEMISTRY
内容类型	期刊论文
源URL	[http://dx.doi.org/doi:CNKI:SUN:JGHX.0.2008-08-007]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Zhang, Rong-Hua,Zhang RH,Zhou, Zhao-Hui,et al. Solid and solution structural studies of dimeric and tetrameric molybdenum(VI) malate complexes[J],2008.
APA	Zhang, Rong-Hua,张荣华,Zhou, Zhao-Hui,周朝晖,Wan, Hui-Lin,&万惠霖.(2008).Solid and solution structural studies of dimeric and tetrameric molybdenum(VI) malate complexes..
MLA	Zhang, Rong-Hua,et al."Solid and solution structural studies of dimeric and tetrameric molybdenum(VI) malate complexes".(2008).

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