Crystal structure of di-benzyl-ammonium hydrogen (4-amino-phen-yl)arsonate monohydrate.

The title salt, C 14 H 16 N + ·C 6 H 7 AsNO 3 - ·H 2 O or [(C 6 H 5 CH 2 ) 2 NH 2 ][H 2 NC 6 H 4 As(OH)O 2 ]·H 2 O, ( I ), was synthesized by mixing an aqueous solution of (4-amino-phenyl)-arsonic acid with an ethano-lic solution of di-benzyl-amine at room temperature. Compound I crystallizes in the monoclinic P 2 1 /c space group. The three components forming I are linked via N-H⋯O and O-H⋯O inter-molecular hydrogen bonds, resulting in the propagation of an infinite zigzag chain. Additional weak inter-actions between neighbouring chains, such as π-π and N-H⋯O contacts, involving phenyl rings, -NH 2 and -As(OH)O 3 functions, and H 2 O, respectively, lead to a three-dimensional network.