Synthesis, crystal structure and magnetic behaviour of (mu(3)-CO3)[Ni-3(Medpt)(3)(NCSe)(4)], a new example of trinuclear nickel(II) complex with pentadentate carbonate bridge and strong antiferromagnetic coupling

摘要

The trinuclear complex (mu(3)-CO3)[Ni-3(Medpt)(3)(NCSe)(4)] was obtained by reaction of basic solutions of nickel(II), Medpt (bis(3aminopropyl)methylamine) and potassium selenocyanate with carbonate anion. The crystal structure of (mu(3)-CO3) [Ni-3(Medpt)(3)(NCSe)(4)] has been solved. The three nickel atoms are asymmetrically bridged by one pentadentate carbonate ligand, which shows the second example of a novel co-ordination mode of the carbonate ligand. The (mu(3)-CO3)[Ni-3(Medpt)(3)(NCSe)(4)] compound shows a very strong antiferromagnetic coupling. Fit as irregular triangular arrangement gave the coupling parameters J(1) = -82.1, J(2) = -67.4 and J(3) = -4.3 cm(-1). (C) 1998 Elsevier Science Ltd. All rights reserved. [References: 19]