Intrinsic Rate of Electron Transfer in the Diffusional Quenching of trans-Stilbene S1 by Fumaronitrile

Article abstract of DOI:10.1021/j100339a041

The quenching of the first excited singlet state of trans-stilbene (S₁) by fumaronitrile in acetonitrile has been examined by picosecond laser spectroscopy.From the time dependence of the rate constant for the quenching of S₁, the intrinsic rate of the electron transfer can be separated from the diffusional contribution.The rate of electron transfer is k_et = 1.9E12 M^-1 s^-1.From the time dependence of the formation of the resulting ion pair, it is concluded that the electron transfer occurs when the molecules are in contact.