BISWAS, Chaitali; DREW, Michael G. B.; ASTHANA, Saket; DESPLANCHES, Cédric; GHOSH, Ashutosh

doi:10.1016/j.molstruc.2009.11.035

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BISWAS, Chaitali
Department of Chemistry
Sarojini Naidu College for Women

DREW, Michael G. B.
School of Chemistry

ASTHANA, Saket
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Molecular Structure. 2010, vol. 965, n° 1-3, p. 39-44

Elsevier

Résumé en anglais

Two new mono-aqua-bridged dinuclear Cu(II) complexes of tridentate NNO Schiff bases, [Cu2(μ-H2O)L12(H2O)2](BF4)2·2H2O (1) and [Cu2(μ-H2O)L22(H2O)2](BF4)2·2H2O (2) where HL1 = 2-[1-(2-dimethylamino-ethylimino)-ethyl]-phenol and HL2 = 2-[(2-dimethylamino-ethylimino)-methyl]-phenol were synthesized. Both the complexes were characterized by single-crystal X-ray diffraction analyses and variable-temperature magnetic measurements. For both the complexes each Cu(II) ion is in a square-pyramidal environment being bonded to three atoms from the tridentate NNO Schiff base and a terminal H2O molecule in the equatorial plane; a second H2O ligand acts as a bridge between the two Cu(II) centres through the axial positions. Hydrogen bonds between the terminal H2O ligand and the Schiff base of the adjacent centre complete the intra-dimer linkages. Variable-temperature (4–300 K) magnetic susceptibility measurement shows the presence of significant antiferromagnetic coupling for both the complexes (J = −12.2 and −12.5 cm−1, respectively, for 1 and 2), mediated mainly through the intra-dimer H-bonds.< Réduire

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Copper(II)

Mono-aqua-bridge

Schiff base

Dinuclear

Crystal structure

Magnetic study

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Mono-aqua-bridged dinuclear complexes of Cu(II) containing NNO donor Schiff base ligand: Hydrogen-bond-mediated exchange couplin

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