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The isotypic hydrogen phosphate and arsenate dihydrates M2HXO4·2H2O (M = Rb, Cs; X = P, As).

Authors
Type
Published Article
Journal
Acta crystallographica. Section C, Structural chemistry
Publication Date
Volume
70
Issue
Pt 1
Pages
7–11
Identifiers
DOI: 10.1107/S205322961303338X
PMID: 24399216
Source
Medline
Keywords
  • Arsenate
  • Crystal Structure
  • Hydrogen Bonding
  • Isotypism
  • Phosphate
  • Pseudosymmetry

Abstract

The four isotypic alkaline metal monohydrogen arsenate(V) and phosphate(V) dihydrates M2HXO4·2H2O (M = Rb, Cs; X = P, As) [namely dicaesium monohydrogen arsenate(V) dihydrate, Cs2HAsO4·2H2O, dicaesium monohydrogen phosphate(V) dihydrate, Cs2HPO4·2H2O, dirubidium monohydrogen arsenate(V) dihydrate, Rb2HAsO4·2H2O, and dirubidium monohydrogen phosphate(V) dihydrate, Rb2HPO4·2H2O] were synthesized by reaction of an aqueous H3XO4 solution with one equivalent of aqueous M2CO3. Their crystal structures are made up of undulating chains extending along [001] of tetrahedral [XO3(OH)](-) anions connected via strong O-H...O hydrogen bonds. These chains are in turn connected into a three-dimensional network via medium-strength hydrogen bonding involving the water molecules. Two crystallographically different M(+) cations are located in channels running along [001] or in the free space of the [XO3(OH)](-) chains, respectively. They are coordinated by eight and twelve O atoms forming irregular polyhedra. The structures possess pseudosymmetry. Due to the ordering of the protons in the [XO3(OH)](-) chains in the actual structures, the symmetry is reduced from C2/c to P21/c. Nevertheless, the deviation from C2/c symmetry is minute.

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