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	Syntheses, spectroscopies and structures of zinc complexes with malate
	Zhang, Rong-Hua ; Hong, Qi-Ming ; Yang, Jin-Mei ; Zhang, Hua-Lin ; Blackburnb, G. Michael ; Zhou, Zhao-Hui ; Zhou CH(周朝晖)
	2008-12
关键词	Zinc Malate Synthesis X-ray crystal structures NMR
英文摘要	Reactions of zinc(II) ion with racemic malic acid (C4H6O5 = H(3)mal) result in the isolation of four new zinc( II) malato complexes: (NH4)[Zn(R-H(2)mal)(3)] center dot H2O (1), trans-[Zn(R-H2mal)(S-H(2)mal)(H2O)(2)] center dot 2H(2)O (2), (NH4)(2)[Zn(R-Hmal)(S-Hmal)] center dot 2H(2)O (3), and [Zn-2(R-Hmal)(S-Hmal)(H2O)(4)](n) center dot 2nH(2)O (4). Three R-malic acids in 1 act as bidentate ligands via their alcoholic and the central carboxy groups with Zn(II) ion, leaving the terminal carboxylic acid groups free. The R- and S-malates of 2 coordinate in a bidentate manner with zinc ion in trans-form. In 3, Zn(II) ion is coordinated by R-and S-malates in a tridentate fashion via their alcoholic and two carboxy groups. Complex 4 forms a two-dimensional layered structure through the links of a new dimeric unit [Zn-2(R-Hmal)(S-Hmal)(H2O) 4] with one of the oxygen atoms from the terminal carboxy group of malate ligand. The coordination of malates depends on pH variation, on Zn: malate ratio, and also on temperature. Tridentate chelation of malate in 3 is found between pH 4.5-9.0. The soluble monomeric species 1-3 have been investigated using C-13 NMR spectra by long-time acquisition. The solution NMR spectra indicate that zinc malate complexes dissociate in H2O (D2O). Obvious down. field shifts of the central carboxy carbon atoms in 1-3 are observed compared with those of free malate, which indicate that these zinc malate complexes dissociate in aqueous solution. (C) 2008 Elsevier B.V. All rights reserved.; National Science Foundation of China [20571061, 20423002]; Ministry of Science and Technology [2005CB221408]
语种	英语
出版者	ELSEVIER SCIENCE SA
内容类型	期刊论文
源URL	[http://dx.doi.org/doi:10.1016/j.ica.2008.12.001]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Zhang, Rong-Hua,Hong, Qi-Ming,Yang, Jin-Mei,et al. Syntheses, spectroscopies and structures of zinc complexes with malate[J],2008.
APA	Zhang, Rong-Hua.,Hong, Qi-Ming.,Yang, Jin-Mei.,Zhang, Hua-Lin.,Blackburnb, G. Michael.,...&周朝晖.(2008).Syntheses, spectroscopies and structures of zinc complexes with malate..
MLA	Zhang, Rong-Hua,et al."Syntheses, spectroscopies and structures of zinc complexes with malate".(2008).

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