Several new P or As compounds containing the 2,4,6-(CF3)3C6H2 (Ar), 2,6-(CF3)2C6H3 (Ar′) and/or 2,4-(CF3)2C6H3 (Ar″) ligands have been synthesised, and characterised by multinuclear NMR spectroscopy and (for all isolated compounds) elemental analysis. The crystal and molecular structures of ArPBr2 1, Ar2PCl 2, Ar″2PCl 3, Ar″2PBr 4, Ar′ Ar″ AsCl 5, Ar′ Ar″ AsBr 6 and Ar′ Ar″ AsH 7 have been determined by single-crystal X-ray diffraction. A particularly interesting feature of these structures is close contacts between ortho-fluorines and the P or As atoms, as observed previously in Ar′ Ar″PCl and Ar2AsCl.
