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Titolo:
BONDING PROPERTIES OF COPPER(II)-IMIDAZOLE CHROMOPHORES - STRUCTURES AND ELECTRONIC-PROPERTIES OF TETRAKIS IMIDAZOLE COPPER(II) COMPLEXES -MOLECULAR-STRUCTURES OF CU(N-METHYLIMIDAZOLE)(4)(CLO4)(2) AND [CU(N-METHYLIMIDAZOLE)(4)(H2O)(2)]CL-2(H2O)
Autore:
SU CC; HWANG KY; CHEN JH; WANG SL; LIAO FL; HORNG JC;
Indirizzi:
NATL TAIWAN NORMAL UNIV,DEPT CHEM TAIPEI TAIWAN NATL TSING HUA UNIV,DEPT CHEM HSINCHU TAIWAN
Titolo Testata:
Polyhedron
fascicolo: 20-21, volume: 14, anno: 1995,
pagine: 3011 - 3021
SICI:
0277-5387(1995)14:20-21<3011:BPOCC->2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPECTRA; CU(II)-IMIDAZOLE; SERIES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
C.C. Su et al., "BONDING PROPERTIES OF COPPER(II)-IMIDAZOLE CHROMOPHORES - STRUCTURES AND ELECTRONIC-PROPERTIES OF TETRAKIS IMIDAZOLE COPPER(II) COMPLEXES -MOLECULAR-STRUCTURES OF CU(N-METHYLIMIDAZOLE)(4)(CLO4)(2) AND [CU(N-METHYLIMIDAZOLE)(4)(H2O)(2)]CL-2(H2O)", Polyhedron, 14(20-21), 1995, pp. 3011-3021

Abstract

The crystal and molecular structures of [Cu(NMIm)(4)(ClO4)(2)] (1) and [Cu(NMIm)(4)(H2O)(2)]Cl-2 .(H2O) (2) (NMIm = N-methylimidazole) havebeen determined from three-dimensional X-ray diffraction data. The structure of 1 consists of discrete centrosymmetric [Cu(NMIm)(4)(ClO4)(2)] units having a CuN4 plane with a set of two trans N-methylimidazoleligands nearly perpendicular to the CuN4 plane (dihedral angle 87.8 degrees) and another set approximately parallel (dihedral angle 4.4 degrees), and two perchlorates on the long z-axis with Cu-O length of 2.718(13) Angstrom. The structure of 2 comprises two discrete structurally similar centrosymmetric [Cu(NMIm)(4)(H2O)(2)] cations interconnectedwith Cl- ions and hydrate molecules by hydrogen bonds. The dihedral angles between the imidazole and the CuN4 planes are 98.8 degrees and 57.6 degrees for one unit and 97.0 degrees and 50.6 degrees for another. Electronic and EPR spectra are reported for 1 and 2 and also for tetrakis complexes of imidazole, 4-methylimidazole, 4-phenylimidazole andbenzimidazole. Analysis of the electronic spectra of 1 and 2 reveals that the former has D-2h symmetry with non-degenerate d(xz) and d(yz) orbitals, and the latter has D-4h symmetry with degenerate d(xz) and d(yz). This is ascribed to the difference in donor abilities of the axial ClO4- and H2O ligands. In solution, all tetrakis species exhibit different structures depending on the donor abilities of the solvent molecules.

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Documento generato il 11/07/20 alle ore 19:43:25