Bis(triphenyl-λ- 5-phosphanylidene)ammonium hydrogen dichloride

Abstract

In the title compound, [(Ph 3P) 2N] +· [Cl-H-Cl] - or C 36H 30NP 2+·Cl 2H -, the H atom of the [Cl-H-Cl] - anion and the N atom of the [(Ph 3P) 2N] + cation are located on a twofold axis, yielding overall symmetry 2 for both the cation and the anion. The central P-N-P angle [144.12 (13)°] of the cation is in the expected range and indicates only weak cation-anion interactions. The almost linear [Cl-H-Cl] - anion is a rare example of a symmetric hydrogen bridge in a hydrogen dichloride anion. The Cl⋯Cl distance and two equal Cl-H bonds are typical of such a symmetric hydrogen dichloride anion.