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Type: Artigo de periódico
Title: Synthesis, crystal structure and magnetic properties of a new dinuclear copper(II) amino acid complex [Cu-2(L-arg)(2)(mu-HPO4-O)(mu-HPO4-O,O ')(mu-OH)](-)center dot(H3O)(+)center dot(H2O)(6)
Author: Santana, RC
Carvalho, JF
Vencato, I
Napolitano, HB
Bortoluzzi, AJ
Barberis, GE
Rapp, RE
Passeggi, MCG
Calvo, R
Abstract: A novel dinuclear copper(II) complex with the amino acid L-arginine (L-arg), with mono and bidentate HPO42- oxoanions and an OH- anion. [CU2(L-arg)(2)(mu-HPO4-O)(mu-HPO4-O,O')(mu-OH)](-) center dot (H3O)(+) center dot 6H(2)O (1) was prepared and its structure was determined by X-ray diffraction methods. The two independent copper ions are in a distorted square pyramidal coordination, each bonded to one L-arginine molecule. These two CU(L-arg) units are bridged by two monoatomic equatorial-apical oxygen ligands belonging to a monodentate hydrogenphosphate group, and to the hydroxyl group. The copper ions in the dinuclear unit at d = 3.1948(8) angstrom are also connected by two equatorial oxygen belonging to a bidentate hydrogenphosphate. This dinuclear character and bridging scheme, not common for metal-amino acid compounds, is a consequence of the properties of the phosphate anions. The magnetic susceptibility at temperatures between 2 and 300 K and the isothermal magnetization curves at T = 2.29(1) K with applied fields up to 9 T were measured. The magnetic data indicate an antiferromagnetic intradinuclear exchange coupling J/k(B) = -3.7(1) K and using a molecular field approximation we estimated a weaker ferromagnetic, interaction J'/k(B) similar to 0.3 K between neighbour dinuclear units. (C) 2007 Elsevier Ltd. All rights reserved.
Subject: copper
binuclear compound
crystal structure
magnetic properties
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Citation: Polyhedron. Pergamon-elsevier Science Ltd, v. 26, n. 17, n. 5001, n. 5008, 2007.
Rights: fechado
Identifier DOI: 10.1016/j.poly.2007.07.005
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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