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Title: Synthesis and Photophysics of Phenylene Based Triplet Donor–Acceptor Dyads: ortho vs. para Positional Effect on Intramolecular Triplet Energy Transfer

Journal Article · · Journal of Photochemistry and Photobiology
ORCiD logo [1]; ORCiD logo [1];  [1];  [2];  [2];  [3];  [4];  [5];  [5]; ORCiD logo [6];  [2]; ORCiD logo [1]
  1. Chicago State Univ., IL (United States); Illinois Institute of Technology, Chicago, IL (United States)
  2. Illinois Institute of Technology, Chicago, IL (United States)
  3. Basque Research and Technology Alliance (BRTA) (Spain). Center for Cooperative Research in Biosciences (CIC bioGUNE)
  4. Stockton University, Galloway, NJ (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Basque Research and Technology Alliance (BRTA) (Spain). Center for Cooperative Research in Biosciences (CIC bioGUNE); Basque Foundation for Science, Bilbao (Spain). IKERBASQUE

Two phenylene based geometrical/isomeric triplet ortho- and para–dyads (o–3 and p–3, respectively) were synthesized and fully characterized using advanced photophysical tools and computations. In dyad o–3, the through-space donor-acceptor interactions led to simultaneous triplet energy transfer and charge transfer with identical kinetics. On the other hand, in the dyad p–3, it was found that the phenylene spacer favors a fast triplet energy delocalization over the charge transfer process. Furthermore, analysis of the results from the present investigation indicates that the deactivation of the photo-excited species (o–3)* occurs through both the intrinsic channel viz. S0←S1 and charge recombination. In the case of dyad p–3, the results indicate that the primary deactivation pathway is self-quenching or triplet-triplet annihilation involving the acceptor unit(s).

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Illinois Institute of Technology; Agencia Estatal de Investigacion (AEI); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1854360
Journal Information:
Journal of Photochemistry and Photobiology, Vol. 10; ISSN 2666-4690
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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