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Photoinduced twisted intramolecular charge transfer (TICT) of meso-(4-dimethylamino)phenylamino subporphyrin and meso-(4-nitro)phenylamino subporphyrin has been revealed by steady-state and time-resolved absorption/fluorescence experiments and quantum calculations. Subporphyrins and undergo molecular twisting at the Cmeso-N bond and the N-Cipso bond, respectively, to trigger intramolecular charge separation, which is restricted at low temperature or in viscous paraffin oil with concurrent fluorescence recovery of local excited states.
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Cha et al. (2014) studied this question.
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