Self-assembled hydrogen-bonded bilayers in 1,4-diazabicyclo[2.2.2]octane–N-(phosphonomethyl)iminodiacetic acid–water (1/1/1.5)

Abstract

The title compound is a hydrated salt, 1,4-diazoniabicyclo[2.2.2]octane-N-[(hydroxyphosphinato)methyl]iminiodiacetate-water (1/1/1.5), C(6)H(14)N(2)(2+).C(5)H(8)NO(7)P(2-).1.5H(2)O, in which one of the water molecules lies across a twofold rotation axis in space group P2/n. The ionic components are linked into sheets by a combination of a three-centre N-H...(O)(2) hydrogen bond and two-centre O-H...O and N-H...O hydrogen bonds, and these sheets are pairwise linked by the water molecules into bilayers, by means of further O-H...O hydrogen bonds.