The catena-arsenite chain anion, [AsO2](n-)(n): (H3NCH2CH2NH3)(0.5)[AsO2] and NaAsO2 (revisited)

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Abstract

The title compounds contain the catena-arsenite [AsO2](n)(n-) unit, in which the As-III atom is pyramidally coordinated to one terminal and two bridging O atoms, resulting in an infinite anionic chain. Ethylenediammonium catena-arsenite, (C2H10N2) (0.5)[AsO2], is the first example of this anion in the company of an organic cation. The ethylenediammonium species interact with the [AsO2](-) chains by way of N - H...O hydrogen bonds. The structure of sodium catena-arsenite, Na[AsO2] [Menary (1958). Acta Cryst. 11, 742 - 743], has been redetermined to yield more reliable geometrical parameters. The As - O distances are normal and the Na+ cation is seven-coordinate [Na - O = 2.285 (4) - 3.063 (4) Angstrom] in a distorted capped trigonal prismatic geometry.

Original languageEnglish
Number of pages4
JournalActa Crystallographica Section C, Crystal Structure Communications
Volume60
DOIs
Publication statusPublished - 2004

Keywords

  • CRYSTAL-STRUCTURE
  • STRUCTURAL CHEMISTRY
  • MINERALS

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