Summary
CuII and NiII coordination compounds with N,N,N′,N′-tetrakis[(2-benzimidazolyl)methyl]-1,2-cyclohexanediamine (CDTB) have been prepared and characterized. The crystal structure of [Cu(CDTB)](ClO4)2 has been determined. The geometry around the Cu atom is highly irregular and can best be described as a cis-distorted octahedron, with four short Cu―N bond distances of 1.988(3) Å and 2.028(3) Å, and two very long Cu―N bond lengths of 2.543(4) A. The cis N―Cu―N chelate angles in the complex range from 68.8(2)∘ for N(1)―Cu―N(1)′ to 141.03° for N(4)―Cu―N(1). The cyclic voltammogram of the complex shows a fully reversible one-electron redox wave at E 1/2 = 0.162V versus standard calomel electrode, corresponding to the CuI/II redox couple. The structure of [Ni(CDTB)](NO3)2 ·EtOH has also been determined. The geometry around the Ni atom in this compound can be described as distorted octahedral, with N(4), N(4)′, N(1), N(1)′ as the ligating atoms in the basal plane, with cis chelate angles ranging from 79.37(10) to 120.9(2)° with the trans N(2)―Ni―N(2)′ angle at 175.1(2)°. The structural differences in these two compounds are undoubtedly electronic rather than steric.
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Oki, A.R., Sanchez, J., Morgan, R.J. et al. Monomeric copper(II) and nickel(II) complexes of N,N,N′,N′-tetrakis [(2-benzimidazolyl)methyl]-1,2-cyclohexanediamine], a chelating ligand containing imidazole groups. Transition Met Chem 21, 43–48 (1996). https://doi.org/10.1007/BF00166011
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DOI: https://doi.org/10.1007/BF00166011