Interaction between Glyglu and Ca2+, Pb2+, Cd2+ and Zn2+ in solid state and aqueous solution. Crystal structures of poly[aqua-1,2-kappa-O-di[lead(glygluH)]bis(perchlorate)] and poly[bisglycylglutamic-cadmium(II) tetrahydrate]
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. Potent...
| Autores: | ; ; ; ; |
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| Tipo de documento: | Artigo |
| Estado: | Published version |
| Data de publicação: | 2002 |
| País: | México |
| Recursos: | UNAM |
| Repositório: | Sistema de Información de la Facultad de Ciencias, UNAM |
| OAI Identifier: | oai:repositorio.fciencias.unam.mx:11154/2502 |
| Acesso em linha: | http://hdl.handle.net/11154/2502 |
| Nível de acesso: | Acesso aberto |
| Palavra-chave: | Chemistry, Inorganic & Nuclear glycylglutamic acid cations spectroscopy equilibrium structures |
| Resumo: | 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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