Nickel(Ⅱ) complexes of a tridentate ligand N, N′, N″-tri-(benzimidazolyl)-methane

摘要

The tripodal ligand N,N′,N″-tri(benzimidazolyl)-methane has been used to synthesize nickel(Ⅱ) complexes along with an exogeneous ligand, X(X = Cl~-, NO_3~-, ClO_4~-, HCOO~-, OAc~- and CNS~-). Electronic absorption spectra reveal that the present nickel(Ⅱ) complexes have six coordinate tetragonal geometries. The value of Racah parameter(B), crystal field splitting parameter (Dq) and term, β~o (which is a measure of covalency) have been calculated. ~1H NMR spectroscopy reveals a dominant σ-delocalization pattern in these complexes.