AI Article Synopsis
- The study investigates how vibrational-electronic resonances affect energy transfer rates in a series of bacteriochlorin dyads that utilize a consistent phenylethyne linker.
- By adjusting the excited-state energy gap between the donor and acceptor using chemical modifications, the rates of energy transfer are found to be rapid, ranging from 0.3 to 1.7 picoseconds, aligning closely with predictions made by Förster theory.
- Despite the potential presence of vibrational-electronic resonances, their effect on energy transfer rates appears minimal, as indicated by the consistent trend and minor deviations from expected values based on the energy gap density.
Article Abstract
The impact of vibrational-electronic resonances on the rate of excited-state energy transfer is examined in a set of bacteriochlorin dyads that employ the same phenylethyne linker. The donor/acceptor excited-state energy gap is tuned from ∼200 to ∼1100 cm using peripheral substituents on the donor and acceptor bacteriochlorin macrocycles. Ultrafast energy transfer is observed with rate constants of (0.3 ps) to (1.7 ps), which agree with those predicted by Förster theory to within a factor of 2. Furthermore, the measured rates follow a trend-line with only small deviations that do not correlate with the density of vibrations at the donor/acceptor excited-state energy gap. Thus, if vibrational-electronic resonances occur in any of these dyads, which seems likely, the impact on the rate of energy transfer is small.
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| http://dx.doi.org/10.1021/acs.jpclett.2c02154 | DOI Listing |
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