Abstract
Abstract Crystalline tetrasodium imidodiphosphate decahydrate, Na4P2O6NH·10H2O, was directly converted to diphosphate by heating above 200°C in air according to the equation: Na_2O_3PNHPO_3Na_2+H_2O→Na_2O_3POPO_3Na_2+H_3 Amorphous tetrasodium imidodiphosphate was prepared by stirring the crystalline imidodiphosphate in excess ethanol. The substitution of an imino group of the amorphous imidodiphosphate for bridging oxygen took place much faster than that of the crystalline one. Imidodiphosphate was hydrolyzed to phosphoramidate and orthophosphate in an aqueous solution: Na_2O_3PNHPO_3Na_2+H_2O→Na_2PO_3NH_2+Na_2HPO_4
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