Enhancement of Photosensitization Behavior of 1-(4-fluorophenyl)-2-(naphthalen-1-yl)-4, 5-diphenyl-1H-imidazole by Nanocrystalline ZnO
1H NMR, 13C NMR, mass spectral and elemental analysis data are used to synthesize and characterize photosensitive imidazole derivative of 1-(4-Fluorophenyl)-2-(Naphthalen-1-yl)-4, 5-Diphenyl-1H-Imidazole [FNDI]. Nano crystalline ZnO synthesized by sol-gel method is characterized by absorption (UV), fluorescence (PL), Fourier-Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM) and Energy Dispersive X ray Spectroscopy (EDS). The nanocrystalline ZnO surface is bounded by the imidazole derivative. Fluorescence enhancement is explained based on Photo-induced Electron Transfer (PET) method, and calculation of apparent binding constant is done. Due to the ligand adsorption on the ZnO nanoparticle, the LUMO and HOMO energy levels of imidazole derivative are lowered, and strong adsorption occurs due to the chemical affinity between the N2 atom of the imidazole derivative and the Zn ion. Fluorescence enhancement occurs due to the electron injection from photo excited imidazole derivative to the ZnO conduction band.
Photosensitive imidazole derivative, ZnO, Sol-gel, Fluorescence, Photo-induced electron transfer.