Adducts of the diphosphine cis-Ph2P(CHdouble bond; length as m-dashCH)PPh2 (L) with AgX (X = NO3, BF4, ClO4 or CF3SO3) have been synthesized and characterized both in solution (1H, 31P NMR) and in the solid state (IR, single crystal X-ray structure analysis). The topologies of the structures in the solid state were found to depend on the nature of the counter-ion X. The adduct AgNO3:L (2:1)2 is tetranuclear, derivative of the chair form, the bidentate ligands bridging peripheral silver centers, the nitrates being coordinated through two oxygen atoms, the first O,O′-bridging the second bridging bidentate.
Pettinari, C., Marinelli, A., Pizzabiocca, A., Effendy, N. V., Skelton, B., & White, A. (2009). Silver(I) cis-diphenylphosphinoethylene complexes: Spectroscopic and structural characterization. Inorganic Chemistry Communications, 12(1), 55-57. https://doi.org/10.1016/j.inoche.2008.11.003