The mechanisms of photoinduced electron transfer in 1-aminopyrene (AP, D-H)-pyridine (Pyr, A) and -methylpyridine (MePyr, A) hydrogen-bonded complexes in nonpolar hexane solutions have been investigated by means of femtosecond-picosecond laser photolysis methods. Rapid electron transfer from the St state of AP to the hydrogen-bonded Pyr or MePyr converging to the equilibrium state, (D*-H-A) «=* (D+-H-A-), has been directly observed by time-resolved transient absorption spectral measurements. The mechanism of the photoinduced electron transfer in nonpolar solvents greatly assisted energetically by specific hydrogen-bonding interactions and also dynamically by a little movement of the proton of D-H toward A in the hydrogen bond has been concluded. The charge recombination deactivation rate from the (D+-H-A-) state to the ground state has been examined for AP-Pyr and various -MePyr systems by time-resolved measurements, and it has been demonstrated that the rate constant decreases exponentially with increase of the energy gap.
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