A second polymorph of bis-(triphenyl-λ(5)-phosphanyl-idene)ammonium chloride-boric acid adduct

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