A second polymorph of bis( triphenyl-λ5 phosphanylidene) ammonium chlorideboric acid adduct

The title crystal structure is a new triclinic polymorph of [(Ph3P)(2)N]Cl center dot(B(OH)(3)) or C36H30NP2+ center dot Cl-center dot BH3O3. The crystal structure of the orthorhombic polymorph was reported by [ Andrews et al. (1983). Acta Cryst. C39, 880-882]. In the crystal, the [(Ph3P)(2)N](+) cations have no significant contacts to the chloride ions nor to the boric acid molecules. This is indicated by the P-N-P angle of 137.28 (8)degrees, which is in the expected range for a free [(Ph3P)(2)N](+) cation. The boric acid molecules form inversion dimers via pairs of O-H center dot center dot center dot O hydrogen bonds, and each boric acid molecule forms two additional O-H center dot center dot center dot Cl hydrogen bonds to one chloride anion. These entities fill channels, created by the [(Ph3P)(2)N]+ cations, along the c-axis direction.