The Polynuclear Complexes of Iron(II,III) and Copper(II) with Cyanide as Bridging Ligand

Abstract
Five novel complexes of the type [CuL2][Fe(CN)5NO]. xH2O (L = ethylenediamine (en), x = 0; L = o-phenanthroline (phen) or 2,2′-bipyridine (bpy), x = 2), [CuL2]3[Fe(CN)6]2. xH2O (L = bpy, x = 6; L = phen, x = 9) have been prepared and studied by elemental analyses, thermal analyses, IR and UV-vis. spectra and magnetic measurements. The structures are proposed with cyanide bridges between Fe(II) and Cu(II) (nitroprusside complexes) or between Fe(III) and Cu(II) (hexacyanoferrate(III) complexes). The temperature dependence of the magnetic susceptibility of the complex [Cu(bpy)2]3[Fe(CN)6]2. 6H2O was measured in the range 94.4–293.5 K but no exchange interaction was found. The product of the thermal decomposition of the complex [Cu(bpy)2]3[Fe(CN)6]2. 6H2O is a mixture of CuO and CuFe2O4, as determined by X-ray powder diffraction.

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