title: Fluorescence spectral studies of some imidazole derivatives.
abstract: The photophysical properties of imidazole derivatives namely 2-(2,4-difluorophenyl)-4,5-dimethyl-1-p-tolyl-1H-imidazole and N,N-dimethyl-4-(4,5-dimethyl-2-phenyl-1H-imidazol-1-yl)benzenamine, synthesized from an unusual four components assembling, were studied in several solvents. Polarization also plays major role in the increase of excited-state dipole moment (μ(e)). From the spectral results, it was found that there is equilibrium between neutral species and monocationic (MC) species in polar aprotic and polar protic solvents. The basicity of the solvent, C(β) or C(SB) has a negative value, suggesting that the absorption and fluorescence bands shift to lower energies with increasing electron-donating ability of the solvent. Therefore, resonance structures 1b and 2b has the positive charge located at the nitrogen atom stabilized in basic solvents.
authors.affiliation: Department of Chemistry, Annamalai University, Annamalainagar, Tamilnadu 608002, India. jtchalam2005@yahoo.co.in
authors.forename: Jayaraman
authors.initials: J
authors.lastname: Jayabharathi
authors.forename: Venugopal
authors.initials: V
authors.lastname: Thanikachalam
authors.forename: Natesan
authors.initials: N
authors.lastname: Srinivasan
authors.forename: Marimuthu Venkatesh
authors.initials: MV
authors.lastname: Perumal
mesh_terms: D000042:Absorption; D000814:Aniline Compounds / Q000737:chemistry*; D005453:Fluorescence; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles / Q000737:chemistry*; D015394:Molecular Structure; D012997:Solvents / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: C572878:2-(2,4-difluorophenyl)-4,5-dimethyl-1-p-tolyl-1H-imidazole; D000814:Aniline Compounds; D007093:Imidazoles; C572880:N,N-dimethyl-4-(4,5-dimethyl-2-phenyl-1H-imidazol-1-yl)benzenamine; D012997:Solvents