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Copper(II) and nickel(II) complexes with 1,5,8,12-tetraazacycloheptadecane and 1,5,8,12-tetraazacyclo-octadecane have been synthesised. These complexes contain 8- and 9-membered chelate rings. The visible spectra of the copper(II) complexes show that the 5,6,5 chelate ring sequence is the most favourable geometry for coordination. The nickel(II) complex of 1,5,8,12-tetraazacycloheptadecane is square planar, but can be converted into corresponding octahedral complexes. The geometrical features of this macrocyclic ligand show that the 4-coordinate nickel(II) species is favoured over the 6-coordinate one.
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Bembi et al. (1985) studied this question.
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