Abstract
The fluorescence and ultraviolet (UV)/visible absorption spectra of apigenin (API) were measured and examined in bulk solutions and aerosol‐OT (AOT) reverse micelles. The Stokes’ shift in micelles is very small due to the small dipole moment change upon excitation. Since the intermolecular interaction between API and H2O in micelles is weak, the fluorescence parameters are relatively insensitive to the change in water concentration compared with those in bulk solutions. Since the B ring can rotate freely, the dihedral angle between the A, C, and B rings can be changed easily by the influence of the solvent. The potential energy curves of the electronic states show a very shallow or no minimum. Although the change in electronic energy by intermolecular interaction will be very small, the point where emission occurs on the energy curve can be altered very sensitively. Due to these reasons, the fluorescence properties of API are very sensitive to changes in excitation wavelength and solvent.
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