Abstract
Abstract Reactions between CuII and NiII salts and the ligand 1,9-bis-(2-pyridyl)-2,5,8-triazanonane at different stoichiometric relations produced two different complexes in the case of CuII and only one with NiII. The spectral properties of these complexes are discussed and the X-ray crystal structure of one of the CuII products is described. The compound consists of a CuII pentacoordinated complex cation (all the donor atoms in L are coordinated) and a tetrahedral [CuCl4]2− group. The coordination geometry of the cation can be described as a distorted square-based pyramid.
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