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The monoclinic polymorph of dimethyl-arsinic acid.

ABSTRACT: The title compound, C(2)H(7)AsO(2) or [As(CH(3))(2)O(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 P[Formula: see text], Z = 2), the current study revealed monoclinic symmetry (space group C2/c, Z = 8) for the second polymorph. The configuration of the tetra-hedral mol-ecule shows approximate C(s) symmetry. Strong O-H?O hydrogen bonds connect the mol-ecules to infinite zigzag chains along [010], which are further connected by weak inter-molecular C-H?O contacts into a three-dimensional network.

SUBMITTER: Betz R 

PROVIDER: S-EPMC3212109 | biostudies-other | 2011 Aug

REPOSITORIES: biostudies-other

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The monoclinic polymorph of dimethyl-arsinic acid.

Betz Richard R   McCleland Cedric C   Marchand Harold H  

Acta crystallographica. Section E, Structure reports online 20110702 Pt 8

The title compound, C(2)H(7)AsO(2) or [As(CH(3))(2)O(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 P[Formula: see text], Z = 2), the current study revealed monoclinic symmetry (space group C2/c, Z = 8) for the second polymorph. The configuration of the tetra-hedral mol-ecule shows approximate C(s) symmetry. Strong O-H⋯O hydrogen bonds connect the mol-ecules to infinite zigzag chains  ...[more]