Hydrogen bonding in 2,2′,2′′-(nitrilotrimethylene)tripyridinium hydrogenphosphate tetrakis(perchlorate) dihydrate and related compounds

Abstract

In the title salt, 2C18H21N43+·HPO42−.4 ClO4−·2H2O. the protons of each of the pyridyl N atoms are hydrogen bonded to one HPO42− ion. In one 2,2′,2′′-(nitrilo­trimethyl­ene)tri­pyridinium cation, all three pyridine N atoms are hydrogen bonded to the same oxygen and the ligand has approximate threefold symmetry; in the other, there are two hydrogen bonds to one O atom, and only one to the third O atom, resulting in an asymmetric ligand. The hydrogen-bonding modes observed in this and related compounds are discussed and their geometries compared.