Magnetic properties of intramolecularly hydrogen-bonded carboxylate copper(II) dimer complexes

Abstract

Novel copper(II) dimer complexes, [Cu2{OCOC6H3Me-2-(NHCOBut)-6}4(MeOH)(H2O)] and [Cu2{OCOC6H3(NHCOBut)2-2,6}4(MeCN2)], containing bulky, intramolecularly NH⋯O hydrogen-bonded carboxylate ligands, are synthesized; the former shows a distorted Cu–O–C–O–Cu structure with a magnetic exchange (–2J= 302 cm–1) between the two CuII ions while the latter has a twisted Cu–O–C–O–Cu structure with a relatively large exchange (–2J= 460 cm–1) through the NH⋯O hydrogen bonds.