Synthesis and structural characterisation of a novel polynuclear copper ribbon-like network. A study of its magnetic properties between 4 and 300 K

A new route to {Cu-2(kappa(1)-pyNH(2))(2)(mu-OMe)(2)Cl-2}(n) (pyNH(2) = 2-aminopyridine) (3) is reported. Structural characterisation reveals the presence of methoxide and chloride bridging units within the complex which support close copper-copper bonding interactions resulting in interesting magnetic properties. The variable-temperature (4-300 K) magnetic susceptibility data of the complex were interpreted with the dimer law using the molecular field approximation. The results obtained indicate a weak antiferromagnetic (zJ' = -15 cm (1)) inter-chain interaction through the chloro-bridge. A relatively strong antiferromagnetic interaction, transmitted through the oxygen-bridge, with an exchange coupling of 2J = -305 cm (1), which dominates the magnetic properties of the title complex. (C) 2009 Elsevier B.V. All rights reserved.