“…4.1.1 Non-cyclic polynuclear complexes of flexible polyfunctional ligands. The 2 : 1 complexes of bis(diorganophosphino)methanes (13a), 16,31 -cyclopropanes (13b), 32 -ethylenes-(1,1) (13c), 33 phosphonium-methylides (13d), 34 -methylides (13e), 35 carbonyl-bis(phosphoniummethylides) 36 or amines and amides (13f,g) 37,38 are protypes of this family of compounds (10b). Most of the examples have halide anions (X = Cl, Br, I) attached to the gold centres, but phenyl derivatives such as (dppm)(AuPh) 2 show the same phenomena.…”