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Issue 24, 2007
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Ligand-controlled nuclearity in nickel bis(benzimidazolyl) complexes

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A series of nickel complexes supported with a tripodal ligand bis(1-methylbenzimidazolyl-2-methyl)amine (L) or bis(1-methylbenzimidazolyl-2-methyl)-10-camphorsulfonamide (L′) on a Ni(II) ion were synthesized and fully characterized. The complexes, [LNiCl(µ-Cl)]2·4CH3OH (1), [LNi(CH3CN)3](ClO4)2·2CH3CN (3), and [L2Ni2(µ-OAc)3]X (X = Cl (5) or ClO4 (7)), coordinated with the tridentate L ligand, all possess an octahedral structure at the nickel center; in contrast, the geometry of the complexes, L′NiCl2 (2), [L′Ni(CH3CN)3](ClO4)2·2CH3CN (4), and L′Ni(OAc)2·0.5Et2O (6), employing the L′ ligand are either tetrahedral or octahedral. Due to the weak coordinating ability of the sulfonamide group and the steric hindrance of the camphorsulfonyl group of L′, the tripodal L′ becomes a bidentate ligand in the presence of chloride or acetate groups, which have a stronger electron donating ability than acetonitrile, bound to the nickel center. It is noteworthy that the nuclearity of the nickel complexes can be controlled by the coordination ability of the central nitrogen of the supporting bis-methylbenzimidazolyl ligand.

Graphical abstract: Ligand-controlled nuclearity in nickel bis(benzimidazolyl) complexes

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The article was received on 29 Jan 2007, accepted on 02 Apr 2007 and first published on 17 Apr 2007

Article type: Paper
DOI: 10.1039/B701367A
Dalton Trans., 2007, 2563-2570

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    Ligand-controlled nuclearity in nickel bis(benzimidazolyl) complexes

    W. Lee, H. Tseng and T. Kuo, Dalton Trans., 2007, 2563
    DOI: 10.1039/B701367A

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