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(Di-methyl-phosphor-yl)methanaminium hydrogen oxalate-oxalic acid (2/1).

ABSTRACT: The reaction of (di-methyl-phosphor-yl)methanamine (dpma) with oxalic acid in ethanol yielded the title solvated salt, C3H11NOP(+)·C2HO4 (-)·0.5C2H2O4. Its asymmetric unit consists of one dpmaH(+) cation, one hydrogen oxalate anion and a half-mol-ecule of oxalic acid located around a twofold rotation axis. The H atom of the hydrogen oxalate anion is statistically disordered over two positions that are trans to each other. The hydrogen oxalate monoanion is not planar (bend angle ?16°) whereas the oxalic acid molecule shows a significantly smaller bend angle (?7°). In the crystal, the components are connected by strong O-H?O and much weaker N-H?O hydrogen bonds, leading to the formation of layers extending parallel to (001). The structure was refined from a racemically twinned crystal with twin components in an approximate 1:1 ratio.

SUBMITTER: Bialek S

PROVIDER: S-EPMC3998424 | biostudies-other | 2014 Mar

REPOSITORIES: biostudies-other

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(Di-methyl-phosphor-yl)methanaminium hydrogen oxalate-oxalic acid (2/1).

Bialek Sebastian S Clemens Rebecca R Reiss Guido J GJ

Acta crystallographica. Section E, Structure reports online 20140215 Pt 3

The reaction of (di-methyl-phosphor-yl)methanamine (dpma) with oxalic acid in ethanol yielded the title solvated salt, C3H11NOP(+)·C2HO4 (-)·0.5C2H2O4. Its asymmetric unit consists of one dpmaH(+) cation, one hydrogen oxalate anion and a half-mol-ecule of oxalic acid located around a twofold rotation axis. The H atom of the hydrogen oxalate anion is statistically disordered over two positions that are trans to each other. The hydrogen oxalate monoanion is not planar (bend angle ∼16°) whereas the ...[more]

PMID: 24765013

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