The nickel(II) complex of a new multidentate ligand containing both imidazole and pyrazole moieties

The synthesis and characterization of the novel ligand 1,5-bis(3,5-dimethyl pyrazol-1-yl)-3-[bis(imidazol-2-yl)methyl]-3-azapentane tome (bdpbiap) is d escribed, together with a representative NI(II) complex. The single crystal X-ray structure of [Ni(bdp-biap)NO3](NO3). 3H(2)O reveals the nickel ion t o be in a distorted octahedral N4O2 geometry imposed by both the ligand and the coordinating didentate nitrate. One of the ligand imidazole groups is not coordinated to the metal ion. The solid-state ligand field electronic s pectra confirm a distorted octahedral nickel(II) environment. The cyclic vo ltammogram shows unusually high reduction potentials for this nickel compou nd. (C) 1999 Elsevier Science S.A. All rights reserved.