- 作者: Renata Karpicz, Vidmantas Gulbinas and Algimantas Undzenas
- 中文摘要: Spectroscopic properties of a fluorenone-based bisazo compound in different organic solvents have been investigated by means of the steady-state absorption and fluorescence spectroscopy and picosecond time-resolved absorption pump-probe spectroscopy. The spectra of the molecules have been shown to be mainly determined by the excitations localized on individual chromophores - azo fragments. Spectra of the azo-enol and hydrazone-quinone tautomeric forms were distinguished. Excited states of the two forms were found to relax in different ways. The hydrazone-quinone form relaxes predominantly nonradiatively with the 400 ps time constant in a-chloronaphthalene, resulting in the fluorescence quantum yield of the order of 10-2. The azo-enol form relaxes via two competing ways, directly to the ground state with the time constant of the order of tens of picoseconds, or via the long-lived intermediate state.
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