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K 3 HAs 2 O 5 -6H 2 O 1 has been crystallised from aqueous solution and its crystal structure established by X-ray analysis. 1 contains isolated hydrogendiarsenite anions HAs 2 O 5  3- , composed of two corner-sharing ψ -AsO 3 -tetrahedra. The anion displays the semi-eclipsed conformation in which the lone-pairs on the As atoms take up a syn-position with respect to an As-O bond on the opposite As atom. As a result the pyramidal coordination geometry of the As atoms is considerably distorted. The HAs 2 O 5  3-  anions in the crystal lattice are linked via O - H ··· O hydrogen bonds into infinite chains parallel to the b-axis, which are surrounded by water molecules of crystallisation

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Das Hydrogendiarsenit-Anion HAs 2 O 5  3-  Darstellung und Struktur von K 3 HAs 2 O 5  • 6 H 2 O / The Hydrogendiarsenite Anion HAs 2 O 5 3- Preparation and Structure of K 3 HAs 2 O 5 -6 H 2 O