Abstract
Structure of iodobicycloheptanyl-N′-(trifluoromethanesulfonyl) acetimidamide epimers and its self-associates in crystal, solution and gas phase was studied by X-ray diffraction, IR spectroscopy and quantum chemistry methods. In an isolated molecule, the 2S,7R-enantiomer is energetically preferred, the structure of which is also realized in the crystal. According to X-ray diffraction analysis, in the crystal, (2S,7R)-N-(7-iodobicyclo[2.2.1]heptan-2-yl)-N′-(trifluoromethanesulfonyl) acetimidamide molecules are linked by intermolecular hydrogen bonds R–NH···O=S. However, according to the quantum-chemical calculations data, the Tf-NH···O=S type H-bonds turn out to be stronger by 3 kcal/mol when dimers are formed. The relative energy of formation of (2S,7S)-N-7-iodobicyclo[2.2.1]heptan-2-yl)-N′-(trifluoromethanesulfonyl) acetimidamide self-associates is ~10 kcal/mol.
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ACKNOWLEDGMENTS
The studies were carried out using the equipment of the material and technical base of the Baikal Analytical Center for Collective Use of the Siberian Branch of the Russian Academy of Sciences.
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Translated from Zhurnal Obshchei Khimii, 2021, Vol. 91, No. 5, pp. 720–727 https://doi.org/10.31857/S0044460X21050085.
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Sterkhova, I.V., Fedorova, T.E. & Moskalik, M.Y. Conformational Analysis and Study of Hydrogen Bonding of Iodobicycloheptanyl-N′-(trifluoromethanesulfonyl) Acetimidamides. Russ J Gen Chem 91, 807–813 (2021). https://doi.org/10.1134/S107036322105008X
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DOI: https://doi.org/10.1134/S107036322105008X