(IUCr) Crystallography Journals Online

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Acta Cryst. (2002). E58, m55-m57 [ doi:10.1107/S1600536802000673 ]

Redetermination of bis(2-aminopyrimidine)bis(nitrato)copper(II)

G. A. Albada, I. Mutikainen, U. Turpeinen and J. Reedijk

Abstract: The crystal structure of the title compound, [Cu(NO₃)₂(C₄H₅N₃)], at room temperature was reported earlier, but full results were not published. According to the present study at 193 K, the Cu^II atom occupies a special position at an inversion centre and has a distorted octahedral geometry. The basal plane is formed by two N atoms of two 2-aminopyrimidine molecules and two O atoms of two trans-oriented nitrate anions. The apical positions are occupied by the remaining O atoms of the chelating nitrate groups. The hydrogen bond, formed by an amino group and the uncoordinated pyrimidine N atom of a 2-aminopyrimidine ligand of the neighbouring molecule of the complex, gives rise to Watson-Crick-type pairwise aggregation of aminopyrimidine ligands, thus creating infinite chains of molecules of the complex stretching along the [10 $\overline 1$ ] direction in the crystal. The chains are further interconnected into layers parallel to the x0z plane, due to additional hydrogen bonds involving the second H atom of the amino group of the 2-aminopyrimidine ligand and the O atom of the nitrate anion of the neighbouring molecule.

Online 25 January 2002