title: Polymeric methylenebis(diphenylphosphine oxide) hydrogen triiodide.
abstract: The conformation of the cationic part of the title compound, [[(C(6)H(5))(2)POH(0.5)](2)CH(2)]I(3) or dppmO(2)H(+) x I(3)(-) (dppm is diphenylphosphinomethane), is determined by hydrogen bonds between cations of monoprotonated [(C(6)H(5))(2)P([double bond]O)](2)CH(2) (dppmO(2)). Symmetric P[double bond]O...H...O[bond]P bridging, with H atoms lying on centres of inversion, leads to chain-like polymeric cations, (dppmO(2)H(+))(x), made up of H...OP(C(6)H(5))(2)[bond]CH(2)[bond](C(6)H(5))(2)PO... moieties. These are, in turn, cross-connected by non-classical C[bond]H...I contacts between the (dppmO(2)H(+))(x) methylene-group H atoms and the terminal I atoms of the triiodide anions, which display crystallographic inversion symmetry.
authors.affiliation: Chemistry Department, Faculty of Science, Minia University, 61519 El-Minia, Egypt.
authors.forename: Ahmed A
authors.initials: AA
authors.lastname: Boraei
authors.forename: Wolf W
authors.initials: WW
authors.lastname: du Mont
authors.forename: Frank
authors.initials: F
authors.lastname: Ruthe
authors.forename: Peter G
authors.initials: PG
authors.lastname: Jones