SARKAR, Mrinal; CLÉRAC, Rodolphe; MATHONIÈRE, Corine; G. R. HEARNS, Nigel; BERTOLASI, Valerio; RAY, Debashis

doi:10.1002/ejic.200900577

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SARKAR, Mrinal
Department of Chemistry, Indian Institute of Technology

CLÉRAC, Rodolphe
Centre de recherches Paul Pascal [CRPP]

MATHONIÈRE, Corine
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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European Journal of Inorganic Chemistry. 2009 n° 31, p. 4675-4685

Wiley-VCH Verlag

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A new family of distorted pentacoordinate [Co2] complexes was prepared and structurally characterized. In [CoIIA- (bip)]2·S (1–3) [A = NCS–, N3 –, NCO–; S = dmf, MeOH, dcm; Hbip = 2,6-bis(phenylmethyliminomethyl)-4-methylphenol], the nonbonded Co···Co separations are in the 3.243 to 3.254 Å range, and the pseudohalide-coordinated CoII ions are asymmetrically doubly bridged by the phenolate oxygen atoms of the ligand. The complementary basal–apical (b–a) and apical–basal (a–b) coordination modes of the phenolate bridges of bip– offer one O and two N donors for metal-ion coordination. In the three dinuclear complexes, the h.s. CoII ions are coupled antiferromagnetically to yield a singlet ground state. The solid-state variable-temperature magnetic susceptibility measurement data on the complexes were fitted to an isotropic Heisenberg dimer model that allowed estimation of the antiferromagnetic interactions for 1–3.< Réduire

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O ligands

Bridging ligands

Cobalt

Structure elucidation

Magnetic properties

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Azido, Cyanato, and Thiocyanato Coordination Induced Distortions in Pentacoordinated [CoIIA(bip)]2 (A = NCS–, N3–, or NCO–) Complexes

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