Abstract
The temperature dependence of the fluorescence steady-state spectra (intensity and bandshape) and nanosecond lifetimes (τf) obtained by light excitation of 2-aminophenyl phenylsulphone in methanol and n-butanol fluid solutions has been examined and compared with that of the Debye (τD) and longitudinal (τL) relaxation times of the solvents. The temperature range explored for each alcohol is from 300 K to the melting point. Hydrogen-bonding effects, connected to non-radiative paths for the deactivation of the emission from the probe, are reduced at low temperature. The temperature-dependent spectral shifts observed in methanol are ascribed to changes in static polarity of the solvent. The spectral shifts observed in n-butanol are consistent with solvent relaxational dynamics taking place on the τL timescale.
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