title: Structure-activity relations of 2-(methylthio)benzimidazole by FTIR, FT-Raman, NMR, DFT and conceptual DFT methods.
abstract: The vibrational fundamental modes of 2-(methylthio)benzimidazole (2MTBI) have been analysed by combining FTIR, FT-Raman and quantum chemical calculations. The structural parameters of the compound are determined from the optimised geometry by B3LYP with 6-31G(∗∗), 6-311++G(∗∗) and cc-pVTZ basis sets and giving energies, harmonic vibrational frequencies, depolarisation ratios, IR intensities and Raman activities. (1)H and (13)C NMR spectra have been analysed and (1)H and (13)C nuclear magnetic resonance chemical shifts are calculated using the gauge independent atomic orbital (GIAO) method. The structure-activity relationship of the compound is also investigated by conceptual DFT methods. The chemical reactivity and site selectivity of the molecule has been determined with the help of global and local reactivity descriptors.
authors.affiliation: Department of Chemistry, Kanchi Mamunivar Centre for Post-Graduate Studies, Puducherry 605 008, India. Electronic address: varjunftir@yahoo.com.
authors.forename: V
authors.initials: V
authors.lastname: Arjunan
authors.forename: Arushma
authors.initials: A
authors.lastname: Raj
authors.forename: P
authors.initials: P
authors.lastname: Ravindran
authors.forename: S
authors.initials: S
authors.lastname: Mohan
mesh_terms: D001562:Benzimidazoles / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D011789:Quantum Theory; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D013438:Sulfhydryl Compounds / Q000737:chemistry*
chemical_list: D001562:Benzimidazoles; D013438:Sulfhydryl Compounds; C031000:benzimidazole
keywords: 2-(Methylthio)benzimidazole; DFT; FT-Raman; FTIR; NMR; Reactivity descriptors