A NEW ONE-DIMENSIONAL SYSTEM STARTING FROM A TRINUCLEAR COPPER(II) COMPLEX AND SELENOCYANATE AS BRIDGING LIGAND - COMPARISON WITH THE THIOCYANATE ANALOG

A new copper(II) bridging-selenocyanate complex has been synthesized s tarting from the known trinuclear copper(II) complex, [{Cu(tmen)}(2){m u-Cu(pba)}][ClO4](2) [tmen = N,N,N',N'-tetramethylethane-1,2-diamine a nd H(4)pba = N,N'-propane-1,3-diylbis(oxamic acid)]. The reaction of a n aqueous solution of this complex with KSeCN gave good crystals of th e new one-dimensional compound in which two selenocyanate ligands are linked to each terminal copper(II) ion. Both these ligands are weakly Se-coupled to the central copper(II) atom of another trinuclear entity giving a pseudo one(two)-dimensional structure. The magnetic behaviou r was recorded between 300 and 4 K, showing strong intramolecular anti ferromagnetic coupling (J = -356 cm(-1), g(C) = 2.20 and g(T) = 2.21; C = central, T = terminal Cu atom) and very weak intermolecular ferrom agnetic coupling.