Özet:

The theoretical conformational structure analyses were performed using density functional theory for thiol and thione tautomeric forms of thioacetic acid (TAA). At the B3LYP/6-311++G(d,p) level, thiol [CH3(C=O)SH] and thione [CH3(C=S)OH] were found more stable than anti forms and the energy differences between these two forms were computed to be ca. 6.7 kJ mol−1 and ca. 27 kJ mol−1, respectively. Barrier energies for thiol and thione forms of thioacetic acid were calculated by using the density functional theory [DFT(B3LYP)/6-311++G(d,p)] method contributing to more than 90% of the population in gas phase at room temperature and also reported a theoretical study on vibrational spectra of thiol and thione tautomeric forms of thioacetic acid obtained by the density functional theory.                       Key Words: thioacetic acid, DFT calculations,                   tautomerisation, PES, IR spectroscopy.

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