Guanidinium phenyl-arsonate-guanidine-water (1/1/2)

In the structure of the title compound, CH(6)N(3) (+)·C(6)H(6)AsO(3) (-)·CH(5)N(3)·2H(2)O, the phenyl-arsonate anion participates in two R(2) (2)(8) cyclic hydrogen-bonding inter-actions, one with a guanidinium cation, the other with a guanidine mol-ecule. The anions are also bridged by the water mol-ecules, one of which completes a cyclic R(5) (3)(9) hydrogen-bonding association with the guanidinum cation, conjoint with one of the three R(2) (2)(8) associations about that ion, as well as forming an R(2) (1)(6) cyclic association with the guanidine mol-ecule. The result is a three-dimensional framework structure.