6533b861fe1ef96bd12c576f
RESEARCH PRODUCT
Origin of the temperature dependence of the rate of singlet energy transfer in a three-component truxene-bridged dyads
Jean-michel BarbeBertrand BrizetBertrand BrizetFranck DenatAdam LangloisClaude P. GrosHai-jun XuPierre D. Harveysubject
chemistry.chemical_compoundFluid solutionFörster resonance energy transferchemistryChemical physicsExcited stateFree baseSingle bondGeneral ChemistrySinglet statePhotochemistryPorphyrinFluorescencedescription
We report a truxene-based dyad built upon one donor (tri-meso-phenylzinc(II)porphyrin) and two acceptors (octa-β-alkylporphyrin free base) in which the donor exhibits free rotation around a Ctruxene-Cmeso single bond at 298 K in fluid solution but not at 77 K in a glass matrix, whereas the acceptors have very limited motion as they are blocked by β-methyl groups. This case is interesting because all the structural and spectroscopic parameters affecting the rate for singlet energy transfer according to a Förster Resonance Energy Transfer are only weakly temperature dependent, leaving only the Dexter mechanism explaining the larger variation in rate of energy transfers with the temperature hence providing a circumstantial evidence for a dual mechanism (Föster and Dexter) in truxene-based dyads (or polyads) in the S1 excited states.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-01-01 | Journal of Porphyrins and Phthalocyanines |