Tribenzylphosphane and its hydrochloride salt, tribenzylphosphonium hydrogen dichloride–tribenzylphosphane (1/1)
Tribenzylphosphane, PBz3 (C21H21P), crystallizes in a notably different unit cell to its Group 15 analogues NBz3 and SbBz3. The packing is dominated by face–edge π‐interactions which result in infinite columns of molecules parallel to the b axis; these columns are linked by further face–edge π‐interactions into sheets of columns parallel to the  direction. Its hydrochloride salt, tribenzylphosphonium hydrogen dichloride–tribenzylphosphane (1/1), lies on a threefold axis within a trigonal crystal system. It exists in the solid state as a hydrogen‐bridged dimer with the composition [H(PBz3)2]+[HCl2]− (C42H43P2 +·HCl2 −). The cation is the first structurally authenticated example of a phosphane acting as a hydrogen‐bond acceptor to a phosphonium group and the cations are linked into a three‐dimensional network through intermolecular face–edge π‐interactions.
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Document Type: Research Article
Affiliations: Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, England
Publication date: May 15, 2013