1.Computational Chemistry Group, Department of Chemistry, Faculty of Science,University of Mauritius,Réduit,Mauritius;2.Department of Pharmaceutical Chemistry, College of Pharmacy,King Saud University,Riyadh,Saudi Arabia;3.Department of Applied Chemistry,University of Johannesburg,Johannesburg,South Africa;4.Department of Chemistry,University of Johannesburg,Johannesburg,South Africa
Abstract:
The characterization of the seleno-sulfide-bromo systems and the isomerization process on the H, S, Se, Br] potential energy surface were investigated using state-of-the-art theoretical methods. The CCSD(T) and the MP2 levels of theory were employed along with the series of correlation consistent basis sets extrapolated to the complete basis set (CBS) limit in the optimization of the geometrical parameters and computation of electronic energies. The relative stability, in kcal mol?1, at the CCSD(T)/CBS follows the trend: HSSeBr (0) > HSeSBr (9.51) > SSeHBr (24.02) > SeSHBr (25.42). This order was observed in the previous study of the H, S, Se, Cl] species. The structural parameters and vibrational frequencies of the H, S, Se, Br] species are reported. This research work should be helpful to experimentalists in order to gain insights into these novel heteroatom molecules.
Graphical abstract Relative energy profile (in kcal mol?1) using the CCSD(T)/CBS and MP2/CBS (in parentheses) method of the stationary states on the H, S, Se, Br] PES.
