Structures of [M(cbim)4(NO3)2] [M = Cd(II), Co(II) and Ni(II); cbim = 4′-Cyanobenzyl-1-imidazole] in the Solid State and in Solution

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Abstract
Mononuclear complexes, [M(cbim)4(NO3)2] [M = Cd(II) (1), Co(II) (2) and Ni(II) (3); cbim = 4′–cyanobenzyl–1–imidazole], were synthesized and their structures were determined by X-ray crystallography. Each metal atom is coordinated by four N atoms of imidazole from four cbim ligands and two O atoms of two nitrate anions with distorted octahedral coordination geometry. All three complexes crystallize in triclinic with space group P1. There are C-H···O, C-H···N hydrogen bonds and π-π interactions in the crystal packing of complexes 1, 2, and 3. The compounds were also characterized by 1H and 113Cd NMR spectroscopy. Highly isotropic shifted signals were observed in the 1H NMR spectra of complexes 2 and 3 due to the paramagnetic property of the high-spin Co(II) and Ni(II) cores.

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