We have synthesized [63Cu(bbim)2](nBu4N) 2(1)by 2,2′-bibenzimidazolate ligands (bbim) with multi-proton donor property as a building block of models for quasi one-dimensional heterobimetallic polymeric complexes with dp-pp interaction. The study of the molecular and electronic structures of 1 and the non-deprotonated form of 1, in terms of crystal structure analysis and magnetic characterization by single-crystal ESR spectroscopy, has been carried out. The angular dependence of the Cu(II) hyperfine ESR spectra of 1 showed that the parallel orientation (B0 ∥ c axis) gave both the maximum copper hyperfine splitting (84 × 10-4cm-1) and the maximum anisotropic g value (g∥ =2.218). The findings show that the copper(II) ion is bound at the site of a tetragonally distorted tetrahedral field, being in accord with the molecular structure of the donor site with the distorted tetrahedral symmetry as obtained by the X-ray crystal analysis. Superhyperfine structures due to the nitrogen atoms of bbim2- dianion were detected in the g, region of the ESR spectrum of [63Cu(bbim)2)(nBu4N)2 in a frozen glass.
|Number of pages||8|
|Journal||Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals|
|Publication status||Published - 1 Jan 1997|