Synthesis, crystal structure and magnetic properties of a new dinuclear copper(II) amino acid complex [Cu2(l-arg)2(μ-HPO4-O)(μ-HPO4-O,O′)(μ-OH)]−·(H3O)+·(H2O)6
| Autor: | Ivo Vencato, Jesiel F. Carvalho, Ricardo Costa de Santana, R. E. Rapp, Mario Cesar Guillermo Passeggi, Hamilton B. Napolitano, G.E. Barberis, Adailton J. Bortoluzzi, Rafael Calvo |
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| Rok vydání: | 2007 |
| Předmět: |
Denticity
Chemistry Ciencias Físicas chemistry.chemical_element Crystal structure Magnetic susceptibility Copper Square pyramidal molecular geometry Ion Inorganic Chemistry Crystallography Materials Chemistry Antiferromagnetism Molecule Physical and Theoretical Chemistry CIENCIAS NATURALES Y EXACTAS Física de los Materiales Condensados |
| Zdroj: | Polyhedron. 26:5001-5008 |
| ISSN: | 0277-5387 |
| Popis: | 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)]-.(H3O)+.6H2O (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/kB = -3.7(1) K and using a molecular field approximation we estimated a weaker ferromagnetic, interaction J´/kB ~ 0.3 K between neighbour dinuclear units. Fil: Santana, R. C.. Universidade Federal de Goiás; Brasil Fil: Carvalho, J. F.. Universidade Federal de Goiás; Brasil Fil: Vencato, I.. Universidade Federal de Goiás; Brasil Fil: Napolitano, H. B.. Universidade Estadual de Goiás; Brasil Fil: Bortoluzzi, A. J.. Universidade Federal de Santa Catarina; Brasil Fil: Barberis, G. E.. Universidade Estadual de Campinas; Brasil Fil: Rapp, R. E.. Universidade Federal do Rio de Janeiro; Brasil Fil: Passeggi, Mario Cesar Genaro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina Fil: Calvo, Rafael. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina |
| Databáze: | OpenAIRE |
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