Anharmonic Molecular Motion Drives Resonance Energy Transfer in peri-Arylene Dyads.

ABSTRACT: Spectral and dynamical properties of molecular donor-acceptor systems strongly depend on the steric arrangement of the constituents with exciton coupling J as a key control parameter. In the present work we study two peri-arylene based dyads with orthogonal and parallel transition dipoles for donor and acceptor moieties, respectively. We show that the anharmonic multi-well character of the orthogonal dyad's intramolecular potential explains findings from both stationary and time-resolved absorption experiments. While for a parallel dyad, standard quantum chemical estimates of J at 0 K are in good agreement with experimental observations, J becomes vanishingly small for the orthogonal dyad, in contrast to its ultrafast experimental transfer times. This discrepanc

SUBMITTER: Slama V 

PROVIDER: S-EPMC7732524 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature