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

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.