A new bidimensional compound containing (μ-thiocyanate) (bpy) copper(II) molecules:: synthesis, crystal structure and magnetic properties of [Cu(bpy)(NCS)2]n (bpy = 2,2′-bipyridyl)

The crystal structure of the first bidimensional copper(II) compound containing only thiocyanate as bridging ligands [Cu(bpy)(NCS)(2)](n), where bpy = 2,2'-bipyridyl, has been determined by X-ray diffraction on single-crystals. Two different environments for both types of copper(II) ions in the unit cell are apparent: a distorted octahedron and a square pyramid. A bidimensional structure with a deformed honeycomb-layer motif is formed, the bipyridyl ligands filling the interlayer space. The magnetic susceptibility data of the compound have been investigated between 280 and 1.8 K. The compound presents a very weak antiferromagnetic interaction that has been fitted by using the Bleaney-Bowers expression for a dimeric unit, whereby a J value of - 1.01(1) cm(-1) ((H) over cap = - J (S) over cap(1) . (S) over cap(2)) and a g value of 2.08(1) have been obtained. (C) 1999 Elsevier Science S.A. All rights reserved.