Chlorido-bridged polymeric and dinuclear copper(II) complexes with tridentate Schiff base: Synthesis, crystal structure and magnetic properties

Two copper(II) complexes, [Cu(qsal)Cl](DMF) (1) and [Cu-2(qsalBr)(2)Cl-2](DMF) (2), with tridentate Schiff base ligands, 8-(salicylideneamino) quinoline (Hqsal) and 8-(5-bromo-salicylideneamino) quinoline (HqsalBr), respectively, were synthesised and structurally characterized. Each copper(II) ion in the two complexes is in a distorted square pyramidal N2OCl2 environment. Complex 1 exists as a polymeric species via equatorial-apical chloride bridges, whereas 2 is a di-chlorido-bridged dinuclear complex, where each bridging chloride simultaneously occupies an in-plane coordination site on one copper( II) ion and an apical site on the other copper(II) ion. Variable-temperature magnetical susceptibility measurements on the two complexes in the temperature range 2-300 K indicate the occurrence of intrachain ferromagnetic (J = +6.58 cm (1)) and intramolecular antiferromagnetical (J = -6.91 cm (1)) interactions. (C) 2009 Elsevier B. V. All rights reserved.