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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Anhydrous thallium hydrogen l-glutamate: Polymer networks formed by sandwich layers of oxygen-coordinated thallium ions cores shielded by hydrogen l-glutamate counterions
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Anhydrous thallium hydrogen l-glutamate: Polymer networks formed by sandwich layers of oxygen-coordinated thallium ions cores shielded by hydrogen l-glutamate counterions

机译：无水th l-谷氨酸氢盐：由被l-谷氨酸氢盐抗衡离子屏蔽的氧配位th离子核的夹心层形成的聚合物网络

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摘要

Anhydrous thallium hydrogen l-glutamate [Tl(l-GluH)] crystallizes from water (space group P2_1) with a layer structure in which the thallium ions are penta- and hexacoordinated exclusively by the oxygen atoms of the γ-carboxylate group of the hydrogen l-glutamate anions to form a two-dimensional coordination polymer. The thallium-oxygen layer is composed of Tl_2O_2 and TlCO_2 quadrangles and is only 3 ? high. Only one hemisphere of the thallium ions participates in coordination, indicative of the presence of the 6s~2 lone pair of electrons. The thallium-oxygen assemblies are shielded by the hydrogen l-glutamate anions. Only the carbon atom of the α-carboxylate group deviates from the plane spanned by the thallium ions, the γ-carboxylate groups and the proton bearing carbon atoms, which are in trans conformation. Given the abundance of l-glutamic and l-aspartic acid in biological systems on the one hand and the high toxicity of thallium on the other hand, it is worth mentioning that the dominant structural motifs in the crystal structure of [Tl(l-GluH)] strongly resemble their corresponding analogues in the crystalline phase of [K(l-AspH)(H_2O)_2].
机译：无水th谷氨酸氢盐[Tl（1-GluH）]从水（空间群P2_1）中结晶，并形成层结构，其中离子仅与氢的γ-羧酸根基团的氧原子五和六配位l-谷氨酸阴离子形成二维配位聚合物。 al-氧层由Tl_2O_2和TlCO_2四边形组成，只有3？高。离子只有一个半球参与配位，表明存在6s〜2个孤对电子。 l-氧组件被1-谷氨酸氢阴离子屏蔽。仅α-羧酸根基团的碳原子偏离由反式构象的th离子，γ-羧酸根基团和带有质子的碳原子所跨越的平面。一方面考虑到生物系统中丰富的l-谷氨酸和l-天冬氨酸，另一方面考虑到the的高毒性，值得一提的是[Tl（l-GluH）晶体结构中的主要结构基序）]在[K（1-AspH）（H_2O）_2]的结晶相中非常类似于其相应的类似物。

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