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维生素C的配位化学。第二部分。L-抗坏血酸与锌（II）、镉（II）、汞（II）和锰（II）离子在固态和水溶液中的相互作用。

Coordination chemistry of vitamin C. Part II. Interaction of L-ascorbic acid with Zn(II), Cd(II), Hg(II), and Mn(II) ions in the solid state and in aqueous solution.

作者信息

Tajmir-Riahi H A

机构信息

Photobiophysics Research Center, University of Quebec, Trois-Rivieres, Canada.

出版信息

J Inorg Biochem. 1991 Apr;42(1):47-55. doi: 10.1016/0162-0134(91)80031-c.

DOI:10.1016/0162-0134(91)80031-c
PMID:2066739
Abstract

The reaction of L-ascorbic acid with the zinc group and manganese ions has been investigated in aqueous solution at pH 6-7. The solid salts of the type M (L-ascorbate)2.2H2O, where M = Zn(II), Cd(II) and Mn(II) were isolated and characterized by 13C NMR and Fourier Transform infrared (FT-IR) spectroscopy. Spectroscopic evidence showed that in aqueous solution, the bindings of the Zn(II) and Mn(II) ions are through the ascorbate anion O-3 and O(2)-H groups (chelation), while the Cd(II) ion binding is via the O-3 atom only. In the solid state, the binding of these metal ions would be through two acid anions via O-3, O-2 of the first and O-1, O-3 of the second anion as well as to two H2O molecules, resulting in a six-coordinated metal ion. The Hg(II) ion interaction leads to the oxidation of the ascorbic acid in aqueous solution.

摘要

已在pH 6 - 7的水溶液中研究了L - 抗坏血酸与锌族和锰离子的反应。分离出了M (L - 抗坏血酸盐)2·2H2O类型的固体盐，其中M = Zn(II)、Cd(II)和Mn(II)，并通过13C核磁共振和傅里叶变换红外(FT - IR)光谱对其进行了表征。光谱证据表明，在水溶液中，Zn(II)和Mn(II)离子通过抗坏血酸根阴离子的O - 3和O(2)-H基团结合（螯合），而Cd(II)离子仅通过O - 3原子结合。在固态中，这些金属离子将通过两个酸根阴离子，经由第一个阴离子的O - 3、O - 2以及第二个阴离子的O - 1、O - 3，以及与两个水分子结合，形成六配位金属离子。Hg(II)离子的相互作用导致水溶液中的抗坏血酸氧化。

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