Isomerization and dealkylation reactions of nickel(II) complexes of macrocyclic tertiary amine ligands: X-ray crystal structures of {Ni[1,4,8,11-tetra(2-cyanoethyl)-1,4,8,11-tetra-azacyclotetradecane](NCMe)2}(ClO4)2·H2O and {Ni[1,8-di (2-carbamoylethyl)-4-(2-cyanoethyl)-1,4,8,11-tetra-azacyclotetradecane]}(ClO4)2

Abstract

Nitrogen inversion reactions have been observed in nickel(II) complexes of macrocyclic tertiary tetra-amine ligands in which the nitrogen substituents are either 2-cyanoethyl or 2-carbamoylethyl; under certain conditions dealkylative loss of the cyanoethyl substituent occurs but loss of a carbamoyl substituent has not been observed for nickel(II) although it has for copper(II).