POLYNUCLEAR COMPLEXES OF NICKEL(II) WITH CYANIDE AS BRIDGING LIGAND

The complexes of the types [NiL2][Ni(CN)(4)] . xH(2)O (L = 1,2-diamino propane (1,2-pn), x = 1; L = 2,2'-bipyridine (bpy), x = 2; L = o-phena nthroline (phen), x = 2), [NiL][Ni(CN)(4)] . xH(2)O (L = triethylenete tramine (tta), x = 0; L = tris(2-aminoethyl)amine (taa), x = 2), and [ Ni(dien)(H2O)][Ni(CN)(4)] (dien = diethylenetriamine) have been prepar ed and studied by elemental analyses, thermal analyses, IR and electro nic spectroscopy, and magnetochemical measurements. Although some of t he complexes have been characterized by temperature-dependent magnetic susceptibilities in the range 94-296 K the exchange interaction was n ot found for [Ni(1,2-pn)(2)][Ni(CN)(4)] . H2O, [Ni(dien)(H2O)][Ni(CN)( 4)], and [Ni(bpy)(2)][Ni(CN)(4)] . 2H(2)O. The splitting of bands nu ( C=N) in infrared spectra indicates the existence of terminal and bridg ed cyanide groups. Polymeric structure with cyanide bridges between sq uare-planar Ni(II) (S = 0) and octahedral Ni(II) (S = 1) is proposed.