2004 Structure

StructureD 2000 The catena-Arsenite Chain Anion, [AsO2 : (H3NCH2CH2NH3)0.5[AsO2] and

NaAsO2 (Revisited). — The title compound (H2en)0.5AsO2 crystallizes in the mono-clinic space group I2/a (Z = 8) and contains the catena-arsenite unit, in which the AsIII atom is pyramidally coordinated to one terminal and two-bridging O atoms, resulting in infinite chains. The ethylenediammonium cations interact with the chains via N—H···O hydrogen bonds. The structure of NaAsO2 (orthorhombic, space group Pbca, Z = 8) is redetermined to yield more reliable geometrical parameters. The As—O distances are normal and the Na+ cation is seven-coordinated (Na—O = 2.285—3.063 Å) in a distorted capped trigonal prismatic geometry. — (LEE, C.; HARRISON*, W. T. A.; Acta Crystallogr., Sect. C: Cryst. Struct. Commun. 60 (2004) 5, m215-m218; Dep. Chem., Univ. Aberdeen, Aberdeen AB24 3UE, UK; Eng.) — Schramke

33- 015]n-

n

[AsO]n-n