A comprehensive study of exchange coupling in a macrocyclic binuclear copper(II) complex in the solid and solution states

Abstract

The exchange-coupled magnetic behavior of a macrocyclic copper(II) aza-amido complex has been studied by a variety of methods both in the solid and solution states. Differences in magnetic interactions in these states have been observed. The solution state studies have been performed using temperature-dependent ¹H NMR chemical shifts caused by the antiferromagnetic nature of the complex. The resulting exchange coupling constants have been compared with the theoretically calculated results. Temperature dependent spin-lattice relaxation time (T₁) measured by the inversion recovery method indicates that the relaxation rate is found to be dominated by electron nuclear dipolar coupling modulated by exchange.