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Issue 41, 2011
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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

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Abstract

Anhydrous thallium hydrogen L-glutamate [Tl(L-GluH)] crystallizes from water (space groupP21) 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 Tl2O2 and TlCO2 quadrangles and is only 3 Å high. Only one hemisphere of the thallium ions participates in coordination, indicative of the presence of the 6s2 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)(H2O)2].

Graphical abstract: 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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Article information


Submitted
10 Jun 2011
Accepted
11 Aug 2011
First published
14 Sep 2011

Dalton Trans., 2011,40, 10885-10888
Article type
Paper

Anhydrous thallium hydrogen L-glutamate: polymer networks formed by sandwich layers of oxygen-coordinated thallium ions cores shielded by hydrogen L-glutamate counterions

T. Bodner, B. Wirnsberger, J. Albering and F. Wiesbrock, Dalton Trans., 2011, 40, 10885
DOI: 10.1039/C1DT11092F

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