The crystal structure of bis(triphenylphosphine)iminium cyclopentadienyltri
carbonylmolybdate, [PPN][Mo(CO)(3)(eta (5)-C5H5)] (PPN+ = [(PPh3)(2)N]+, C3
6H30NP2), is reported. The anion is configured in the 'piano-stool' arrange
ment while the cation adopts a bent configuration about the P-N-P bond. An
'expanded-phenyl-embrace' supramolecular motif is noted in the packing of t
he PPN+ cation.