Acta Cryst. (2007). E63, m2573  [ doi:10.1107/S1600536807044728 ]

cyclo-Tetra--oxido-tetrakis[3-nitro-4-hydroxyphenylarsenic(III)]

N. C. Lloyd and B. K. Nicholson

Abstract: The title compound, [As₄O₄(C₆H₄NO₃)₄], has an eight-membered As₄O₄ ring with a slightly twisted boat-chair conformation. The aryl groups complete the threefold coordination for each As atom. Each OH group forms a strong intramolecular O-HO hydrogen bond to the adjacent NO₂ group, with only weak C-HO, OAs [3.036 (6)-3.184 (6) Å] and OO [2.921 (10)-2.930 (10) Å] interactions between tetramers.

Online 21 September 2007

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