Synthesis and Crystal Structure of a New Hydrated Phosphinate Salt, [(C6H5CH2)2NH2][(C6H5)2P(O)(O)].H2O

Abstract

The asymmetric unit of the title hydrated salt contains one [(C6H5CH2)2NH2]+ cation, one [(C6H5)2P(O)(O)]– anion and one solvent water molecule. In the anion, the P atom is in a distorted tetrahedral [C]2P[O][O] environment with the highest angle of 116.38(9)˚ for the O–P–O angle and the lowest angle of 102.74(10)˚ for the C–P–C angle. The most characteristic feature of the cation is the open C–N–C angle (of 113.50(17)˚). In the crystal structure, the cations, anions and water molecules are hydrogen-bonded to each other, through O–H...O (O...O = 2.904(3)Å and 2.921(2)Å) and N–H...O (N...O = 2.731(2)Å and 2.766(3)Å) hydrogen bonds, building a linear arrangement along the b axis. In this hydrogen bond pattern, the PO groups act as a double hydrogen-bond acceptor.