Structure and intramolecular stabilization of geometric isomers of Bi- and trithiazolidine-4-ones and their methyl derivatives: A DFT and QTAIM study

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Abstract
At the DFT level with the B3LYP hybride functional the structure and relative stability of geometric isomers of bi- and trithiazolidine-4-ones are calculated. Based on Bader’s analysis of the electron density distribution the presence of intramolecular hydrogen bonds and van der Waals interactions is found in the studied isomers. Energies of these interactions are calculated. It is shown that the presence of a substituent in the thiazolidine ring affects the stabiliyty of the studied geometric isomers.

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