Cyano-bridged bimetallic complexes of copper(II) with tetracyanonickelate(II). Crystal structure of [Cu(dpt)Ni(CN)4]
摘要:
Five new complexes of composition [Cu(dpt)Ni(CN)(4)] (1) (dpt = dipropylenetriamine), [Cu(dien)Ni(CN)(4)].2H(2)O (2) (dien = diethylenetriamine), [Cu(N,N'-dimeen)Ni(CN)(4)].H2O (3) (N,N'-dimeen = N,N'-dimethylethylenediamine), [Cu(N,N-dimeen)Ni(CN)(4)].H2O (4) (N,N-dimeen N,N-dimethylethylenediamine) and [Cu(trimeen)Ni(CN)(4)] (5) (trimeen=N,N,N'-trimethylethylenediamine) have been obtained by the reactions of the mixture of Cu(ClO4)(2).6H(2)O, appropriate amine and K-2[Ni(CN)(4)] in water and have been characterized by IR and UV-Vis spectroscopies and magnetic measurements. The crystal structure of [Cu(dpt)Ni(CN)(4)] (1) has been determined by single-crystal X-ray analysis. The structure of 1 consists of a one-dimensional polymeric chain -Cu(dpt)-NC-Ni(CN)(2)-CN-Cu(dpt)- in which the Cu(II) and Ni(11) atoms are linked by CN groups. The nickel atom is four coordinate with four cyanide-carbon atoms (two cyano groups are terminal and two cyano groups (in cis fashion) are bridged) in a square-planar arrangement and the copper atom is five coordinate with two cyanide-nitrogen and three dpt-nitrogen atoms, in a distorted square-pyramidal arrangement. The temperature dependence of magnetic susceptibility (2-300 K) was measured for compound 1. The magnetic investigation showed the presence of a very weak anti ferromagnetic interaction (J = - 0.16 cm(-1)) between the copper atoms within each chain through the diamagnetic Ni(CN)(4)(2-) ions. (C) 2001 Elsevier Science Ltd. All rights reserved.