Structures of glycinium phosphite and glycylglycinium phosphite

The structure of glycinium phosphite consists of a layer arrangement of planes containing infinite [H(HPO 3 )] n n- chains alternating with planes built by the organic anions, both layers developing parallel to the bc plane. Strong hydrogen bonds corresponding to O-O distances of 2.482 and 2.518 A are responsible for the cohesion between the HPO 3 tetrahedra along this «macroanion». The same type of infinite [H(HPO 3 )] n n- chain is observed in the glycylglycinium derivative which differs 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