title: Symmetric hydrogen bonding in dimethylammonium hydrogen diphenyldiphosphonate.
abstract: In the title compound, C2H8N+.C12H11O5P2-, pairs of hydrogen diphenyldiphosphonate anions form dimers across a twofold axis, with two symmetric O...H...O hydrogen bonds [O...O = 2.406 (3) and 2.418 (3) A]. The 12-membered ring thus formed has crystallographic 2 and quasi-222 symmetry. Cations on either side of the ring form N-H...O hydrogen bonds to the four extraannular O atoms, with N...O distances of 2.765 (2) and 2.748 (3) A.
authors: Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803-1804, USA.
authors: Brandy H
authors: BH
authors: Courtney
authors: Booker W O
authors: BW
authors: Juma
authors: Steven F
authors: SF
authors: Watkins
authors: Frank R
authors: FR
authors: Fronczek
authors: George G
authors: GG
authors: Stanley