title: Tetraethylammonium dihydrogenarsenate bis(arsenic acid) and 1,4-diazoniabicyclo[2.2.2]octane bis(dihydrogenarsenate) arsenic acid: hydrogen-bonded networks containing dihydrogenarsenate anions and neutral arsenic acid molecules.
abstract: The title compounds, (C(8)H(20)N)[H(2)AsO(4)][H(3)AsO(4)](2), (I), and (C(6)H(14)N(2))[H(2)AsO(4)](2)[H(3)AsO(4)], (II), are unusual salts containing organic cations, dihydrogenarsenate anions and neutral arsenic acid molecules. In (I), the dihydrogenarsenate anion lies across a twofold rotation axis in the space group C2/c, while the cation is disordered across a centre of inversion. The [H(2)AsO(4)](-) and H(3)AsO(4) species interact by way of O-H...O hydrogen bonds, leading to sheets and a three-dimensional network for (I) and (II), respectively.
authors.affiliation: Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB24 3UE, Scotland.
authors.forename: Clare
authors.initials: C
authors.lastname: Lee
authors.forename: William T A
authors.initials: WT
authors.lastname: Harrison
mesh_terms: D001149:Arsenates / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D008958:Models, Molecular; D015394:Molecular Structure; D009795:Octanes / Q000737:chemistry; D010879:Piperazines / Q000737:chemistry*; D019789:Tetraethylammonium / Q000737:chemistry*
chemical_list: D001149:Arsenates; D009795:Octanes; D010879:Piperazines; D019789:Tetraethylammonium; C026728:octane; C007306:triethylenediamine