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1 2009

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Synthesis and Properties of New Bimetallic Complexes of General Formula: [Cu(diamine)2][Cr(NCS)4(NH3)2]2

Wrzeszcz G., Grzebielucha T.

Polish Journal of Chemistry

2009

Vol. 83, nr 9

1575-1582

Four new thiocyanato bridged heteronuclear com plexes of general formula [Cu(diamine)2][Cr(NCS)4(NH3)2]2, where diamine = ethylenediamine (en) (1), 1,2-di -amino propane (pn) (2), 1,3-diaminopropane (tn) (3) and N-methylethylenediamine (men) (4) have been prepared in solid state by treatment of [Cr(NCS)4(NH3)2]– with corresponding cationic [Cu(diamine)2]2+ complex in anaqueous solutions. They have been characterized by elemental and thermal analysis, spectroscopic methods (IR, UV-Vis, EPR), and variable-temperature magnetic susceptibility measurements. The formation of end-to-end thiocyanato bridges between tetragonal (elongated octahedral) Cu(II) and octahedral Cr(III) is evident from IR and electronic spectra. The EPR spectra measured at room temperature on solid samples (1 and 3) show very broad and symmetric signal at g = 2.02 and 2.07, respectively. Magnetic data reveal the absence of significant exchange inter actions between the Cr(III) and Cu(II) ions in all studied complexes (1–4). Thermal decomposition after ammonia release is multistage and yields CuO, and Cr2O3 as final products.