Bis(Acesulfamato-κ2N3,O4)bis­(2-Amino­pyrimidine-κN1)copper(II)

Abstract

In the crystal structure of the title compound, bis(2-amino-pyrimidine- κN1)bis[6-methyl-1,2,3-oxathiazin-4(3H)-one 2,2-dioxide(1-)-κ2N3,O4]copper(II), [Cu(C<inf>4</inf>H<inf>4</inf>NO<inf>4</inf>S)<inf>2</inf>(C<inf>4</inf>H <inf>5</inf>N<inf>3</inf>)<inf>2</inf>], the first mixed-ligand complex of acesulfame, the CuII centre resides on a centre of symmetry and has an octahedral geometry that is distorted both by the presence of four-membered chelate rings and by the Jahn-Teller effect. The equatorial plane is formed by the N atoms of two amino-pyrimidine (ampym) ligands and by the weakly basic carbonyl O atoms of the acesulfamate ligands, while the more basic deprotonated N atoms of these ligands are in the elongated axial positions with a strong misdirected valence. The crystal is stabilized by pyrimidine ring stacking and by intermolecular hydrogen bonding involving the NH<inf>2</inf> moiety of the ampym ligand and the carbonyl O atom of the acesulfamate moiety. © 2005 International Union of Crystallography.