Crystal structure and exchange pathways of the complex L-(trypthophyl-glycinato)copper(II)

被引:27
作者
Nascimento, OR [1 ]
Costa, AJ [1 ]
De Morais, DI [1 ]
Ellena, J [1 ]
Delboni, LF [1 ]
机构
[1] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
crystal structures; exchange; cation-pi interactions; model system;
D O I
10.1016/S0020-1693(00)00356-X
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The crystal structure and the EPR characterization of the compound Cu [C13H13N3O3] is reported. It crystallizes in the P2(1)2(1)2(1) space group, with a = 8.2829(5), b = 9.347(2), c = 16.499(2) Angstrom and Z=4. The copper ion is in a distorted square planar coordination, bonded to two nitrogen and one oxygen atoms from one dipeptide and to an oxygen atom from a symmetry-related molecule. Thus, neighbor copper atoms at 5.14 Angstrom are connected by equatorial syn-anti carboxylate bridges giving rise to a chain structure along the b-axis. The chains are connected via hydrogen bonds and cation-pi interactions, the latter being provided by the 'sandwich' structure involving each copper atom and two tryptophan residues from neighbor molecules. The EPR spectra of polycrystalline sample imply an essentially d(x2-y2) ground state orbital for the Cu(II) ions. The g-values reflect a slightly distorted axial symmetry around the Cu(II) ions as expected from the structural results. No hyperfine interaction is observed, which is indicative of the presence of exchange interactions between the copper atoms as suggested by the X-ray results as well. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:133 / 138
页数:6
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