Research Article: (Diethyl­enetriamine)bis­(theophyllinato)zinc(II) dihydrate

Date Published: May 01, 2009

Publisher: International Union of Crystallography

Author(s): Béla Mihály, Edit Forizs, Attila-Zsolt Kun, Ioan Silaghi-Dumitrescu.


In the title compound, [Zn(C7H7N4O2)2(C4H13N3)]·2H2O, the ZnII ion is penta­coordinated by three N atoms of the diethyl­enetriamine ligand and one N atom of each of the two theophyllinate anions in a distorted trigonal-bipyramidal geometry. The Zn—N distances range from 2.076 (3) to 2.221 (3) Å. The crystal packing is stabilized by O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds involving the theophylline and diethyl­enetriamine ligands and uncoordinated water mol­ecules.

Partial Text

For the isostructural copper(II) compound, see Sorrell et al. (1976 ▶). For the theophylline mol­ecule acting as a monodentate anionic ligand, see: Begum & Manohar (1994 ▶); Birdsall & Zitzman (1979 ▶); Bombicz et al. (1997 ▶).




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