Abstract
The present investigation was carried out to reveal the nature of photoinduced bimolecular quenching reactions, e.g. electron transfer (ET) and energy transfer processes within the donor DMA and acceptor 2-nitrofluorene (2NF) molecules in polar acetonitrile (ACN) fluid solution at the ambient temperature. From the observed large negative values of ΔG (the energy gap between the locally excited, LE and radical ion pair or RIP states) when one of the chromorphores was excited along with large R 0 ( ∼27 A ̊ ), Förster critical transfer distance between the donor and acceptor measured from the considerable overlapping region of donor DMA emission with acceptor absorption and nearly 100% theoretical transfer efficiency ( T) value of the Förster type energy transfer the concurrent occurrences of the two processes, photoinduced ET and excitational energy transfer, were inferred. Moreover it was suggested that ET reaction within the present donor and acceptor systems is of outersphere type as evidenced from the large negative value of ΔG (∼ −2.3 eV).
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