期刊
INORGANICA CHIMICA ACTA
卷 339, 期 -, 页码 193-201出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/S0020-1693(02)01047-2
关键词
glycylglutamic acid; cations; spectroscopy; equilibrium; structures
Glycylglutamic acid (GEH(2)) is a peptide usually present in calcium binding sites. The interaction between the peptide and the cations Ca2+ Pb2+, Cd2+, and Zn in aqueous solution and in the solid state is described. Six compounds were isolated with different protonation states of the ligand. Potentiometric equilibrium studies, C-13 and Cd-111 solid state CP MAS NMR and IR spectroscopy were performed. Two crystal structures are reported: [Pb(GEH)(H2O)](1/2)]ClO4 and [Cd(GEH)(2)].3H(2)O. Both constitute 3D polymers, where only carboxylate groups are coordinated to the cations. The crystalline lead compound shows a hemidirected coordination sphere due to its stereochemically active lone pair. In deprotonated derivatives, it is possible to assign a metal-amino interaction to a far IR signal (340-370 cm(-1)). (C) 2002 Elsevier Science B.V. All rights reserved.
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