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Sulfonated phosphanes are very important ligands in homogeneous catalytic hydrogenation or hydroformylation reactions performed in environmentally acceptable aqueous medium. We managed to determine the structure of several such compounds by forming their guanidinium salt[1]. However, their intensive hydrogen bond forming ability turned to be very interesting from supramolecular point of view, too. Sulfonated analogs of triphenylphosphane and their derivatives offer excellent possibility to compare and fine-tune H-bond, van der Waals and other secondary interactions depending on substituents and degree of sulfonation especially when their guanidinium salts are studied[2]. However, one of the most interesting compound[3] turned to be (tris(2,4-dimethyl-5sulfonatophenyl)phosphane. This sterically very crowded phosphane crystallizes in trigonal space group and shows the internal C3 molecular symmetry in the crystal structure, too.

Hydrogen-bond pattern in guanidinium salts of sulfonated phosphanes