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Journal of Coordination Chemistry
Year: 2009  |  Volume: 62  |  Issue: 20  |  Page No.: 3250 - 3258

5,5-Diethylbarbiturato complexes of copper(II) with (2-aminoethyl)piperidine, -pyrrolidine, and -morpholine: syntheses, crystal structures, spectroscopic, and thermal properties

M. Suat Aksoy, Veysel T. Yilmaz and Orhan Buyukgungor    

Abstract: Three new complexes, [Cu(barb)2(aepip)] · 0.5H2O (1), [Cu(barb)2(aepyrd)] (2), and [Cu(barb)2(aemrph)] (3), have been synthesized by reaction of 5,5-diethlybarbiturate anion (barb) with copper(II) in the presence of (2-aminoethyl)piperidine (aepip), -pyrrolidine (aepyrd), and -morpholine (aemrph). All complexes were characterized by elemental analysis, spectroscopic (IR and UV/Vis), thermal (DTA-TGA), and magnetic susceptibility measurements. X-ray single crystal diffraction shows that 1 and 2 are discrete mononuclear species, in which copper(II) is coordinated by two bidentate barb ligands and a chelating aepip or aepyrd, forming a square-pyramidal coordination geometry. Complexes 1 and 2 show unequal coordination of barb, one N-coordinate, and one bidentate. Complex 3 is also mononuclear, but copper(II) is square-planar with two N-coordinated barb and one bidentate aemorph. Molecules of 1-3 are bridged by strong hydrogen bonds to generate 1-D or 2-D supramolecular networks. Spectral and thermal data for 1-3 are in agreement with crystal structures.

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