Sm(III) complexation with small peptides.: Crystal structure of [SM2(Gly-Val)4(H2O)8](ClO4)6•2H2O

被引：8

作者：

Torres, J

Kremer, C ^{[1
]}

Kremer, E

Pardo, H

Russi, S

Mombrú, A

Domínguez, S

Mederos, A

机构：

[1] Catedra Quim Inorgan, Fac Quim, Montevideo CC1157, Uruguay

[2] Lab Cristallog, Fac Quim, Montevideo CC1157, Uruguay

[3] Univ La Laguna, Dept Quim Inorgan, Tenerife, Canary Isl, Spain

来源：

INORGANICA CHIMICA ACTA | 2003年 / 355卷

关键词：

samarium; peptides; glycylvaline; potentiometry; crystal structures;

D O I：

10.1016/S0020-1693(03)00373-6

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

in this work, samarium(III) complexes with small peptides have been studied by potentiometric measurements. Experiments were performed in aqueous solution at 37.0degreesC and 0.15 M NaClO4, resembling physiological medium. Low stability Sm(III)-peptide complexes were detected. Complexes with 1:1 ligand to metal molar ratio are predominant in the studied conditions. For Gly-Gly, the smallest dipeptide, [Sm(HL)(2)](3+) was also detected. For pH values greater than 6, hydrolysis to [Sm(OH)](2+) and Sm(OH)(3) becomes the main process. One of these complexes was isolated and characterized in the solid state. X-ray structure of [Sm-2(GlyVal)(4)(H2O)(8)](ClO4)(6)(.)2H(2)O is here reported. In this dimeric complex, two samarium. atoms, with coordination number nine, are connected via four bridging carboxylate groups. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：442 / 448

页数：7

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