N1,N1-Dimethylpropane-1,2-diaminium bis-(6-carboxypyridine-2-carboxyl-ate) monohydrate

Abstract

The asymmetric unit of the title proton-transfer compound, C 5H16N2 2+·2C 7H4NO4-·H2O, consists of two mono-deproton-ated pyridine-2,6-dicarboxylic acid molecules as anions, viz. (py-2,6-dcH)-, one diprotonated N 1,N 1-diMethylpropane-1,2-diamine molecule as a cation, viz. (dmpdaH 2)2+, and one water molecule. The crystal packing shows extensive O - H⋯O, N - H⋯O, N - H⋯N and O - H⋯N and weak intermolecular C - H⋯O hydrogen bonds. These inter-actions link the (dmpdaH2)2+ cation, the (py-2,6-dcH)- anions and water molecule and play an important role in the stabilization of crystal packing.