Abstract
The reaction of (dimethylphosphoryl)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-molecule 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.
Highlights
Institut für Anorganische Chemie und Strukturchemie, Lehrstuhl II: Material- und Strukturforschung, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany
Its asymmetric unit consists of one dpmaH+ cation, one hydrogen oxalate anion and a halfmolecule 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
Summary
Institut für Anorganische Chemie und Strukturchemie, Lehrstuhl II: Material- und Strukturforschung, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany. Its asymmetric unit consists of one dpmaH+ cation, one hydrogen oxalate anion and a halfmolecule 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 ). The components are connected by strong O—H O and much weaker N—. The structure was refined from a racemically twinned crystal with twin components in an approximate 1:1 ratio. We acknowledge the support for the publication fee by the "Lehrförderfond" of the Heinrich-Heine-Universität Düsseldorf
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