Abstract
The dynamics of photoinduced electron injection and energy transfer from benzimidazole to CuO, Fe2O3, WO3 and Al2O3 nanoparticles has been studied by FT-IR, absorption and fluorescence spectroscopic methods. The association between nanoparticles and the benzimidazole derivative was explained from both absorption and fluorescence quenching data [Kapp=2.11×106M−1 (CuO); 4.11×106M−1 (Fe2O3); 2.91×106M−1 (WO3) and 3.85×106M−1 (Al2O3)]. There is good agreement between these values of Kapp obtained from the data of fluorescence quenching with those determined from the absorption spectral changes which highlighted the validity of the association between benzimidazole and nanoparticles. The distance between the benzimidazole derivative and nanoparticles (r0~3.12nm) as well as the critical energy transfer distance (R0~1.70nm) has been calculated. By applying the Rehm–Weller equation, the free energy change (ΔGet) for electron injection has also been calculated.
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