Abstract
Abstract The nickel(II) complex with L1 (5,5,7-trimethylcyclam: 5,5,7-trimethyl-1,4,8,11-tetrazacyclotetradecane), trans-[NiL1(H2O)2]Cl2·H2O, was isolated. An X-ray structural analysis gave strong evidence for the presence of steric interaction between the axial methyl substituent at the 5-position and the water molecule coordinating to the nickel(II) ion. The bimacrocyclic cobalt(III) complex with L3 (6,6′-bi[5R(S),7S(R)-dimethyl-1,4,8,11-tetraazacyclotetradecane], trans-[Co2L3Cl4]Cl2, was synthesized and its structure was analyzed by X-ray crystallography, as well as the monomacrocyclic trans- and cis- dichlorocobalt(III) complexes with L2 (5R(S),7S(R)-dimethyl-1,4,8,11-tetraazacyclotetradecane). The structure of trans-[Co2L3Cl4]2+ was quite different from that of [Ni2L3]4+. In trans-[Co2L3Cl4]2+, the bridged six-membered chelate rings adopted an approximately twist-boat conformation. The steric interaction between the coordinated chloride anions on the cobalt(III) ion and the methyl substituents introduced at the 5- and 7-positions in the six-membered chelate ring was discussed.
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