Synthesis, characterization of triamine complexes of nickel(II)selenocyanate and their thermally induced dimerization: X-ray single crystal structures of [Ni(dpt)(SeCN)(2)(H2O)] and [Ni(aepn)(SeCN)(2)(H2O)] (dpt = bis (3-aminopropyl)amine and aepn = (2-aminoethyl)(3-aminopropyl)amine)

[NiL(SeCN)(2)(H2O)] [L = bis(3-aminopropyl)amine (dpt), (1), (2-aminoethyl) (3-aminopropyl)amine (aepn), (2) and bis(2 aminoethyl)methylamine) (medien) , (3)] have been synthesized and characterized in the solid state by X-ray single crystal analysis (1 and 2), IR, electronic spectra and magnetic meas urement. Structure analyses of (1) and (2) reveal that the nickel(II) cente r is coordinated in a distorted octahedral fashion and the two SeCN groups are attached in trans position. Upon heating they undergo deaquation follow ed by color change, yielding dinuclear species bridging through selenocyana te. The deaquated dinuclear complexes have been characterized by IR, electr onic spectra and magnetic susceptibility measurement. (C) 2000 Elsevier Sci ence Ltd. All rights reserved.