Abstract
The experimental electron-density distribution in a~toxalic acid dihydrate, a-C2H204.2H20, as measured by Dam, Harkema & Feil [Acta Cryst. (1983), B39, 760-768], is compared with results from a theoretical density-functional calculation, with a local approximation to exchange and correlation. The agreement between the multipole-refined experimental and the refined vibrationally averaged theoretical electrondensity distribution improves significantly when taking into account the effects of hydrogen bonding and crystal environment. A comparison of structure factors based on the experimental electron-density distribution with those based on the vibrationally averaged theoretical molecular-density distributions, yielded an R factor of 1.3%. Inclusion of the effects of hydrogen bonding in the theoretical model lowered the R factor to 1.1%. When the effects of the crystal environment were taken into account, a further lowering to 1.0% resulted.
| Original language | English |
|---|---|
| Pages (from-to) | 609-616 |
| Journal | Acta crystallographica. Section B: Structural science |
| Volume | 44 |
| DOIs | |
| Publication status | Published - 1988 |
Keywords
- IR-59221
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Krijn, P. C. M., Graafsma, H., & Feil, D. (1988). The influence of intermolecular interactions on the electron-density distribution. A comparison of experimental and theoretical results for a-oxalic acid dihydrate. Acta crystallographica. Section B: Structural science, 44, 609-616. https://doi.org/10.1107/S0108768188005907