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

Original scientific paper

Two Types of Pyridine Ligands in Mononuclear and Dinuclear Copper(II) Carboxylates

Bojan Kozlevčar ; Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, P. O. Box 537, SI-1001 Ljubljana, Slovenia
Anica Murn ; Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, P. O. Box 537, SI-1001 Ljubljana, Slovenia
Katja Podlipnik ; Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, P. O. Box 537, SI-1001 Ljubljana, Slovenia
Nina Lah ; Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, P. O. Box 537, SI-1001 Ljubljana, Slovenia
Ivan Leban ; Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, P. O. Box 537, SI-1001 Ljubljana, Slovenia
Primož Šegedin ; Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, P. O. Box 537, SI-1001 Ljubljana, Slovenia

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Abstract

Copper(II) acetate [Cu(OOCCH3)2(L1)2] (L1 = 2,6-diaminopyridine) (1), [Cu(OOCCH3)2(L2)2] (L2 = 2-amino-6-methylpyridine) (2) and benzoate compounds [Cu2(OOCC6H5)4(L1)2]·2CH3CN (3), [Cu2(OOCC6H5)4(L1)2] (4), [Cu2(OOCC6H5)4(L2)2] (5), [Cu(OOCC6H5)2(L2)2] (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 1.9560(12)–2.007(3) Å) and pyridine nitrogen atom from two pyridine ligands (Cu–N 2.013(3)–2.282(14) Å), forming a CuO2N2 plane, while the second carboxylate oxygen atoms are more distant (Cu–O 2.488(3)–2.7648(16) Å). The dinuclear paddle- wheel central core was found in 5 (Cu–O 1.942(6)–1.992(6) Å), with pyridine nitrogen atoms in the axial positions (Cu–N 2.283(7), 2.284(7) Å). All compounds were characterized by magnetic measurements, electronic and vibrational spectroscopy and tested for fungal growth retardation activity.

Keywords

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

Hrčak ID:

102989

URI

https://hrcak.srce.hr/102989

Publication date:

30.11.2004.

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