(Pentane-2,4-dionato-κ2O,O′)(pyridin-2-amine-κN1)copper(II) and (pentane-2,4-dionato-κ2O,O′)(pyrimidin-2-amine-κN1)copper(II)

Abstract

The title compounds, [Cu(C5H7O2)2(C5H6N2)], (I), and [Cu(C5H7O2)2(C4H5N3)], (II), were prepared by the reaction of bis(pentane-2,4-dionato-κ2O,O′)copper(II) with pyridin-2-amine and pyrimidin-2-amine, respectively. From a chemical point of view, it is interesting that no Schiff base formation was observed. The compounds are isostructural, with both having a square-pyramidal coordination of the CuIIatom and intramolecular N—H...O hydrogen bonding. The additional N atom of the pyrimidin-2-amine ligand is not involved in hydrogen bonding or in metal coordination. In the crystal structure, chelate rings are involved in π–π interactions and molecules of (I) are linked togetherviaN—H...O hydrogen bonds.