Abstract
Abstract The formation of two aromatic hydrocarbon ions on the surface of Al2O3–MoO3 has already been postulated. The concentrations of these paramagnetic species were measured for various solvents by using DPPH single crystals as the reference standard. The formation of two different aromatic ions on the surface of Al2O3–MoO3 could also be confirmed by the solvent dependence. The intensity of microwave magnetic field H1 and the modulation width were considered in this measurement. Without solvent molecules such as benzene on the oxide surface, an ESR signal without cation hyperfine structure was almost exclusively observed. The intensities and intensity ratio between the two components of the ESR absorption at g=2.00, with and without hyperfine structure, change with solvent. The results indicated that solvent molecules, when adsorbed on the oxide surface, form a surface structure or a surface system which makes the charge transfer from the oxide surface to the solute hydrocarbon easier.
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