Vibrational studies (FTIR and Raman), conformational analysis, NBO, HOMO-LUMO and reactivity descriptors of S - methyl thiobutanoate, CH3CH2CH2C(O)SCH3

DIEGO M. GIL; M. E. TUTTOLOMONDO; A. BEN ALTABEF

SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY.

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2015 vol. 149 p. 408 - 418

1386-1425

In the present article, the molecular structure of S-methyl thiobutanoate, CH3CH2CH2C(O)SCH3 was determined by ab initio (MP2) and DFT calculations using different basis sets. The infrared and Raman spectra for the liquid phase were also recorded and the bands observed were assigned to the vibrational normal modes. The experimental and calculations confirm the presence of two most stable conformers, one with syn- pseudo anti conformation and another with syn-gauche conformation. The study was completed using natural bond orbital (NBO) and AIM analysis.The molecular properties like dipole moment, molecular electrostatic potential surface (MEP) and HOMO-LUMO molecular orbitals were calculated to get a better insight of the properties of the title molecule. Global and local reactivity descriptors were computed in order to predict reactivity and reactive sites on the molecule for nucleophilic, electrophilic and radical attacks.