A series of 9H-fluorenols and 9H, 9’H-bifluorenyls were irradiated in less polar solvents giving photoproducts derived from their corresponding 9H-fluorenyl radicals. These transient species were directly observed by laser flash photolysis and their UV/visible spectra compared to those of their corresponding cations. Theoretical calculations (DFT) of these intermediates indicate their destabilizing nature in similar fashion to the antiaromatic character of the corresponding cations.
- The concept of Photochemistry and equipment used,
- The nature of reactive intermediates and how they are useful in understanding mechanisms
- Substituent effects in predicting stabilities of intermediates.