Some novel imidazole derivatives were developed as highly sensitive chemisensors for transition metal ions. A prominent fluorescence enhancement was found in the presence of transition metal ions such as Hg2+, Pb2+,Cu2+, Zn2+, Co2+ and Fe2+ and this was suggested to result from the suppression of radiationless transitions from the n-pi* state in the chemisensors. By OFT calculation HOMO LUMO energies were calculated, the electric dipole moment (mu) and the hyperpolarizability (beta) of the investigated molecules have been studied experimentally and also theoretically. These synthesized molecules were found to have microscopic non-linear optical (NLO) behaviour with non-zero tensor components. (C) 2011 Elsevier B.V. All rights reserved.
Luminescent study on the binding interaction of bioactive imidazole with bovine serum albumin—A static quenching mechanism
Novel bioactive imidazole derivatives were synthesized and characterized by NMR spectra, mass and CHN analysis. The interaction between the imidazole derivative and bovine serum albumin (BSA) was investigated by fluorescence and UV-vis absorption spectroscopy. The fluorescence quenching of BSA by the imidazole derivatives may be due to the formation of imidazole-BSA complex. The fluorescence quenching mechanism of BSA by irnidazole was analyzed and the binding constant has been calculated. The binding distance between imidazole and BSA was obtained based on Forester's non-radiation energy transfer (FRET). The effect of some common ions on the binding constant between imidazole and BSA was also examined. (C) 2011 Elsevier B.V. All rights reserved.
Fluorescence spectral studies of some imidazole derivatives
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