Symmetrical and unsymmetrical bridging carbonyl groups in binuclear molybdenum carbonyl complexes of alkylaminobis(difluorophosphines); X-ray crystal structures of two of the complexes

Abstract

Thermal reactions of the olefin-molybdenum carbonyls C₇H₈Mo(CO)_n(n= 4, C₇H₈= norbornadiene; n= 3, C₇H₈= cycloheptatriene) with RN (PF₂)₂ ligands (R = Me and Ph) in hydrocarbon solvents at 100–120 °C lead ultimately to binuclear complexes of the type [RN(PF₂)₂]_nMo₂(CO)_{11 – 2n}(n= 3, 4, and 5); structure determinations by X-ray diffraction on [PhN(PF₂)₂]₃Mo₂(CO)₅ and [MeN(PF₂)₂]₄Mo₂(CO)₃ indicate the presence of symmetrical and unsymmetrical bridging carbonyl groups, respectively.