The monoclinic polymorph of dimethylarsinic acid
Richard Betz, Cedric McCleland, Harold Marchand
Acta Crystallographica Section E · 2011
doi:10.1107/s1600536811025505 (opens in a new tab)
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Abstract
The title compound, C2H7AsO2 or [As(CH3)2O(OH)], is an organic derivative of arsinic acid, and is also known by its trivial name cacodylic acid. In contrast to the first polymorph (triclinic, space group Poverline{1}, Z = 2), the current study revealed monoclinic symmetry (space group C2/c, Z = 8) for the second polymorph. The configuration of the tetrahedral molecule shows approximate Cs symmetry. Strong O—H...O hydrogen bonds connect the molecules to infinite zigzag chains along [010], which are further connected by weak intermolecular C—H...O contacts into a three-dimensional network.
Abstract licence: CC BY
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