title: Ab initio determination of geometries and vibrational characteristics of building blocks of organic superconductors: 4,5-Ethylenedithio-1,3-dithiole-2-thione, and 4,5-ethylenedithio-1,3-dithiole-2-one.
abstract: RHF and DFT calculations were carried out to study the optimized molecular geometries and vibrational characteristics of the 4,5-ethylenedithio-1,3-dithiole-2-thione (EDT-DTT) and 4,5-ethylenedithio-1,3-dithiole-2-one (EDT-DTO) molecules and their radical cations and anions. It is found that the anionic radical of the EDT-DTO molecule is unstable. Both the neutral molecules and their radical cations have non-planar structures with C(2) symmetry while the radical anion of the EDT-DTT molecule has non-planar structure with C(1) symmetry. It is found that the most of the vibrational characteristics of the radicals are similar to their corresponding neutral molecules, however, for some of the modes significant changes are noticed. As a result of anionic radicalization of EDT-DTT, the IR intensity and Raman activity increase and Raman band becomes polarized for both the CH(2) twisting modes. Drastic enhancements in the Raman activity and reduced IR intensity are noticed for the C=S/O stretching mode in going from neutral molecules to their radical ions consistent with charge separation along this bond. The C=S and C=C stretching wavenumber changes are consistent with corresponding bond length changes in going from neutral to their radical ions.
authors.affiliation: Department of Physics, Banaras Hindu University, Varanasi 221005, UP, India.
authors.forename: S
authors.initials: S
authors.lastname: Jaiswal
authors.forename: Deepshikha
authors.initials: D
authors.lastname: Singh
authors.forename: R L
authors.initials: RL
authors.lastname: Prasad
authors.forename: R A
authors.initials: RA
authors.lastname: Yadav
mesh_terms: D004553:Electric Conductivity; D008958:Models, Molecular; D015394:Molecular Structure; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman; D013871:Thiones / Q000737:chemistry*
chemical_list: D013871:Thiones