Spectroscopic and potentiometric study of copper(II) complexes with L-histidyl-glycyl-L-histidyl-glycine in aqueous solution

被引:30
作者
Casolaro, M
Chelli, M
Ginanneschi, M
Laschi, F
Muniz-Miranda, M
Papini, AM
Sbrana, G
机构
[1] Ctr CNR Studio Chim & Struttura Composti Eterocic, Dipartimento Chim Organ Ugo Schiff, I-50121 Florence, Italy
[2] Univ Florence, Dipartimento Chim, I-50121 Florence, Italy
[3] Univ Siena, Dipartimento Chim, I-53100 Siena, Italy
[4] Univ Siena, Dipartimento Sci & Tecnol Chim & Biosistemi, I-53100 Siena, Italy
关键词
copper complexes; His containing peptides; tetrapeptides; NMR; EPR; IR; Raman; UV and CD spectra;
D O I
10.1016/S1386-1425(98)00328-X
中图分类号
O433 [光谱学];
学科分类号
0703 ; 070302 ;
摘要
The complex formation between copper(II) and the tetrapeptide L-histidyl-glycyl-L-histidyl-glycine (HL) has been studied in aqueous solution in the pH range 2-10.5, by potentiometric and spectroscopic methods (visible, CD, EPR, H-1 NMR and Raman scattering). Between pH 3 and 6 the species [CuHL](2+) and [CuH-1L] have been detected. The former complex co-ordinates through two nitrogen and two oxygen atoms in the equatorial plane while, for the latter, the spectroscopic data (particularly Raman spectra) suggests an unusual structure with the two imidazole rings and two peptide NH in the plane. The species at pH 7, [CuH-2L](-), is involved in the co-ordination by the amino group, the His(1) imidazole and two peptide nitrogens, while, for the complex [CuH-3L](2-), which seems to be predominant in alkaline medium, a third deprotonated backbone NH, replaces the imidazole nucleus. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:1675 / 1689
页数:15
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