STRUCTURES OF GLYCINIUM PHOSPHITE AND GLYCYLGLYCINIUM PHOSPHITE

The structure of glycinium phosphite consists of a layer arrangement o f planes containing infinite [H(HPO3)]nn- chains alternating with plan es built by the organic anions, both layers developing parallel to the bc plane. Strong hydrogen bonds corresponding to O-O distances of 2.4 82 and 2.518 angstrom are responsible for the cohesion between the HPO 3 tetrahedra along this 'macroanion'. The same type of infinite [H(HPO 3)]nn- chain is observed in the glycylglycinium derivative which diffe rs from the first compound in that the organic entities are connected by hydrogen bonds. A comparison between these two atomic arrangements and the corresponding monophosphates is given.