Organophosphoryl adducts of tris(pentafluorophenyl)borane; crystal and molecular structure of B(C6F5)3·Ph3PO

A series of 1 ∶ 1 adducts of B(C6F5)3 with the organophosphoryl ligands Et3PO, Ph3PO, Prn3PO, Octn3PO, (MeO)3PO, (EtO)3PO, (PhO)3PO, (EtO)2(H)PO, (BunO)2(H)PO, (PhO)2(H)PO, (MeO)2MePO, (EtO)2MePO, (EtO)2PhPO, and (EtO)Me2PO have been synthesized and characterised by elemental analysis, mp, and spectroscopic (1H, 13C, 11B, 19F, 31P NMR and IR) methods. B(C6F5)3·Ph3PO was further characterised in the solid state by a single-crystal X-ray diffraction study. 31P NMR chemical shifts and ν(PO) IR stretching frequencies are discussed in relation to substituent at phosphorus.