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Titolo:
STRUCTURE AND MAGNETISM OF AN EXCHANGE-COUPLED SYSTEM - AN NMR APPROACH
Autore:
ASOKAN A; MANDAL PK; VARGHESE B; MANOHARAN PT;
Indirizzi:
INDIAN INST TECHNOL,DEPT CHEM MADRAS 600036 TAMIL NADU INDIA INDIAN INST TECHNOL,DEPT CHEM MADRAS 600036 TAMIL NADU INDIA
Titolo Testata:
Proceedings of the Indian Academy of Sciences. Chemical sciences
fascicolo: 4, volume: 107, anno: 1995,
pagine: 281 - 295
SICI:
0253-4134(1995)107:4<281:SAMOAE>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
DICOPPER(II) COMPLEXES; SPIN STATES; DIMERS; RESONANCE; LIGANDS;
Keywords:
ANTIFERROMAGNETIC; INTRA AND INTERDIMER INTERACTION; H-1-NMR; CHEMICAL SHIFT; EXCHANGE COUPLING; HYPERFINE COUPLING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
A. Asokan et al., "STRUCTURE AND MAGNETISM OF AN EXCHANGE-COUPLED SYSTEM - AN NMR APPROACH", Proceedings of the Indian Academy of Sciences. Chemical sciences, 107(4), 1995, pp. 281-295

Abstract

A binuclear copper(II) complex [Cu(2)L(OH)](ClO4)(2) . 2H(2)O has been synthesized and characterized by X-ray crystallography and H-1-NMR studies. The crystal structure shows that the bridging angles between Cu(1)-O(1)-Cu(2) and Cu(1)-O(2)-Cu(2) are 98.9(2)degrees and 102.2(2)degrees respectively. The Cu(1)-Cu(2) distance is 3.0097(12)Angstrom. This indicates that the interaction between the two copper atoms is antiferromagnetic in nature. The geometry around Cu(1) is distorted square-pyramid with one water molecule occupying the axial fifth position, whereas, the geometry around Cu(2) is distorted square-planar with weakinteractions of one of the perchlorate anion. There are eight molecules present in the unit cell. There is an interdimer interaction between the dimers. The temperature-dependent H-1-NMR chemical shift studieshave been performed on six different protons of this complex which reveals that the exchange coupling constant(-2J) is same for all protons(208 +/- 1 cm(-1)). However, the hyperfine coupling constant (A') wasfound to be different in magnitude as well as in sign. We also reportsolvent dependent NMR properties.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 14:52:03