Abstract
We show that the rate of through-bond-mediated intramolecular singlet-singlet electronic energy transfer (EET) in the rigid novel 10-bond DMN-bridge-dione 2(10) is five orders of magnitude faster than that predicted for 1(10) DMN monoketone and observed in the steroid systems exhibiting comparable interchromophore separations of 12.5A˚. The efficiency of energy transfer (99.5% calculated based on the measured rate) is also much larger than that observed in flexibly linked systems containing the same donor-acceptor chromophores, for which through space EET via exchange interaction is dominant, thus indicating the possibility of controlling EET by judicious molecular engineering.
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