Interplay between singlet and triplet excited states in a conformationally locked donor–acceptor dyad

Abstract
The synthesis and photophysical characterization of a palladium(II) porphyrin – anthracene dyad bridged via short and conformationally rigid bicyclo[2.2.2]octadiene spacer were achieved. A spectroscopic investigation of the prepared molecule in solution has been undertaken to study electronic energy transfer in excited singlet and triplet states between the anthracene and porphyrin units. By using steady-state and time-resolved photoluminescence spectroscopy it was shown that excitation of the singlet excited state of the anthracene leads to energy transfer to the lower-lying singlet state of porphyrin. Alternatively, excitation of the porphyrin followed by intersystem crossing to the triplet state leads to very fast energy transfer to the triplet state of anthracene. The rate of this energy transfer has been determined by transient absorption spectroscopy. Comparative studies of the dynamics of triplet excited states of the dyad and reference palladium octaethylporphyrin (PdOEP) have been performed.

Citation
Interplay between singlet and triplet excited states in a conformationally locked donor–acceptor dyad 2015, 44 (44):19207 Dalton Trans.

Publisher
Royal Society of Chemistry (RSC)

Journal
Dalton Transactions

DOI
10.1039/C5DT03784K

Additional Links
http://xlink.rsc.org/?DOI=C5DT03784K

Permanent link to this record