Synthesis, structural characterization and conformational aspects of thenoylthiocarbamic-O-alkylesters

A set of four N-thenoylthiocarbamic-O-n-alkylesters, where alkylester = propylester, butylester, pentylester and hexylester were structurally characterized in solid state by single crystal X-ray diffractometry. The supramolecular structure for each compound is stabilised by N-H···O hydrogen bonds. For each compound gaseous phase ab initio geometry optimizations for several conformations were performed at the B3LYP/6-311++G(d,p) level of theory in order to evaluate and compare the calculated geometry with the experimental molecular crystal geometry as well as to evaluate the energetic difference between several alkyl conformations. The compounds were further analysed by FTIR spectroscopy and the experimental FTIR spectra were compared with the calculated ones at B3LYP/6-311++G(d,p) level of theory. The structural results for the set were further used in the interpretation of the odd and even effect found previously in their thermophysical properties.