Solid-state tautomerism in 2-carboxyindan-1,3-dione.

  title={Solid-state tautomerism in 2-carboxyindan-1,3-dione.},
  author={Venelin Enchev and Silvia E Angelova and Marin I. Rogojerov and Valentin Monev and Iwona Wawer and Michał Tkaczyk and Kalina Kostova},
  journal={The journal of physical chemistry. A},
  volume={115 10},
The structure of 2-carboxyindan-1,3-dione was investigated using a combination of quantum-chemical calculations and solid-state NMR and IR spectroscopy. Due to poor solubility of the compound in different solvents, no single crystals could be obtained. Two dimeric structures formed from the tautomers of 2-carboxyindan-1,3-dione are likely to coexist in the solid state. The dimers interconvert via intramolecular proton transfer in one of the tautomeric forms constituting the dimers. The energy… 
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2-Methylthio-imidazolins: a rare case of different tautomeric forms in solid state and in solution

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