Abstract
Results of the X-ray diffraction studies of 1-imino-1H-isoindol-3-amine and its derivatives reveal unusual distribution of bond lengths within the NH2–C=N amidine fragment in the considered crystals. In the crystal phase, single C–N bond is shorter or at most has the same length as double C=N bond, while in isolated molecules both these bonds have expected lengths, according to the calculations by MP2/6-311G(d,p) and MP2/cc-pvtz methods. It is demonstrated that so unusually strong polarization of the amidine fragment is induced by polar environment in solid state. This effect stabilizes the amino-imino tautomer of 1-imino-1H-isoindol-3-amine, which becomes more stable than the diimino tautomer possessing the lowest energy in the gas phase.
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Shishkin, O.V., Konovalova, I.S., Zubatyuk, R.I. et al. Remarkably strong polarization of amidine fragment in the crystals of 1-imino-1H-isoindol-3-amine. Struct Chem 24, 1089–1097 (2013). https://doi.org/10.1007/s11224-012-0131-y
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DOI: https://doi.org/10.1007/s11224-012-0131-y