Acta Cryst. (2005). E61, m1123-m1125  [ doi:10.1107/S1600536805014649 ]

[2,6-Bis(2-pyridylamino)pyridine]dinitratocadmium monohydrate

X.-N. Fang, X.-F. Li and X.-R. Zeng

Abstract: The Cd atom in the title complex, [Cd(NO₃)₂(C₁₅H₁₃N₅)]·H₂O or [Cd(NO₃)₂(tpdaH₂)]·H₂O (tpdaH₂ is tripyridyldiamine), has a pentagonal-bipyramidal coordination formed by the tridentate tpdaH₂ ligand and two chelate nitrate groups. The tpdaH₂ ligand is mer-coordinated, with the N atom of the central pyridine ring in the equatorial position [Cd-N = 2.3148 (17) Å] and the N atoms of the peripheral pyridine rings in the axial positions [Cd-N = 2.2345 (19) and 2.2351 (19) Å, and N-Cd-N = 169.39 (6)°]. The remaining four equatorial positions are occupied by the four O atoms of two nitrate groups, one of which has almost equal Cd-O bond lengths [2.431 (2) and 2.4644 (19) Å], whereas the other shows a significant difference between the Cd-O bond lengths [2.441 (2) and 2.603 (2) Å]. The H atoms of both NH groups of the tpdaH₂ ligand are involved in hydrogen bonds with water O atoms as acceptors, whereas both water H atoms form hydrogen bonds with the O atoms of one of the nitrate groups. The hydrogen bonds link the molecules of the title complex and solvent molecules into an infinite three-dimensional network.

Online 14 May 2005

Copyright © International Union of Crystallography
IUCr Webmaster