title: Hydrogen-bonded network in biphenyl-4,4'-diphosphonic acid.
abstract: The crystal structure of the title compound, C(12)H(12)O(6)P(2), displays two different regions alternating along the a axis: a hydrogen-bonded region encompassing the end-positioned phosphonic acid groups and a hydrophobic region formed by the aromatic spacers. The asymmetric unit contains only half of the biphenyl-4,4'-diphosphonic acid (4,4'-bpdp) molecule, which is symmetric with an inversion centre imposed at the mid-point between the two aromatic rings. The periodic organization of the molecules is controlled by two strong O-H...O interactions between the phosphonic acid sites. Weak C-H...pi interactions are established in the aromatic regions.
authors.affiliation: Department of Chemistry, Wrocław University of Technology, 27 Wybrzeze Wyspiańskiego Street, 50-370 Wrocław, Poland.
authors.forename: G
authors.initials: G
authors.lastname: Próchniak
authors.forename: J
authors.initials: J
authors.lastname: Zoń
authors.forename: M
authors.initials: M
authors.lastname: Daszkiewicz
authors.forename: A
authors.initials: A
authors.lastname: Pietraszko
authors.forename: V
authors.initials: V
authors.lastname: Videnova-Adrabińska