Two Types of Pyridine Ligands in Mononuclear and Dinuclear CopperII CarboxylatesReport as inadecuate

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Croatica Chemica Acta, Vol.77 No.4 November 2004. -

CopperII acetate CuOOCCH32L12 L1 = 2,6-diaminopyridine 1, CuOOCCH32L22 L2 = 2-amino-6-methylpyridine 2 and benzoate compounds Cu2OOCC6H54L12·2CH3CN 3, Cu2OOCC6H54L12 4, Cu2OOCC6H54L22 5, CuOOCC6H52L22 6, were synthesized and characterized. X-ray structure analysis revealed monomeric structure in 1 and 6. In 1, cis arrangement of the ligands was found, and trans in 6, in an elongated octahedral CuO4N2 chromophore. The basal plane in 1 and 6 is formed by one co-ordinated oxygen atom from both carboxylates Cu–O 1.956012–2.0073 Å and pyridine nitrogen atom from two pyridine ligands Cu–N 2.0133–2.28214 Å, forming a CuO2N2 plane, while the second carboxylate oxygen atoms are more distant Cu–O 2.4883–2.764816 Å. The dinuclear paddle- wheel central core was found in 5 Cu–O 1.9426–1.9926 Å, with pyridine nitrogen atoms in the axial positions Cu–N 2.2837, 2.2847 Å. All compounds were characterized by magnetic measurements, electronic and vibrational spectroscopy and tested for fungal growth retardation activity.

copper; π -stacking; structure; spectroscopy; carboxylates; pyridine ligands

Author: Bojan Kozlevčar - ; Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, P. O. Box 537, SI-1001



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