Fluorenes photochemical properties

Photochemical Properties of Fluorenes Under One-photon Excitation. .. 127... 

The photochemical stabihty of the molecules is characterized by the quantum yield of photodecomposition, (P = N/Q [69], where N and Q are the numbers of decomposed molecifles and absorbed photons, respectively. The photochemical properties of the fluorene derivatives were investigated in different organic solvents (hexane, CH2CI2, ACN, and polyTHF) at room temperature by the absorption and fluorescence methods and comprehensively described [70-72]. These methods are based on measurements of the temporal changes in the steady-state absorption and fluorescence spectra during irradiation. For the absorption method, the quantum yield of the photodecomposition under one-photon excitation, c >ipa, can be obtained by the equation [73] ... 

Ahmed, S.A., Photochromism of dihydroindoHzines. II. Synthesis and photophysical properties of new photochromic IR-sensitive photoswitchable substituted fluorene-9 -styrylquinoline- dihy-droindoKzines, ibid., 15, 392, 2002 Ahmed, S.A., Abdel-Wahab, A.A., and DUrr, H., Steric substituent effects of new photochromic tetrahydromdoHzines leading to tunable photophysical behavior of the colored betaines, /. Photochem. PhotobioL, A Chem., 154, 131, 2003. 

---