Abstract
The rate constants for electron-transfer (ET) reactions between the photoexcited acception 9-cyanoathracene and two series of vinylogous hydrocarbon donors are reported. the HOMOs of these donors alternatvie in symmetry which leads to the expectation of a ‘saw-tooth’ relationship for the ET quenching rate constants. This is indeed observed but the effect is quite small, the rate constants varying by a factor of < 10 between ‘allowed’ and ‘forbidden’ orbital symmetries.
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