In:
Angewandte Chemie, Wiley, Vol. 129, No. 32 ( 2017-08), p. 9528-9532
Abstract:
Singlet fission (SF), in which one singlet exciton (S 1 ) splits into two triplets (T 1 ) on adjacent molecules through a correlated triplet‐pair 1 (TT) state, requires precise but difficult tuning of exciton energetics and intermolecular electronic couplings in the solid state. Antiaromatic 4nπ dibenzopentalenes (DPs) are demonstrated as a new class of single‐chromophore‐based intramolecular SF materials that exhibit an optically allowed S 2 state with E(S 2 ) 〉 2×E(T 1 ) and an optically forbidden S 1 state. Ultrafast population transfer from a high‐lying S 2 state to a 1 (TT) state was observed in monomeric solution of styryl‐substituted DP (SDP) on a sub‐picosecond timescale. There is evidence of exciton diffusion (ED) of the 1 (TT) state to yield two individual long‐lived triplets in SDP thin film. The overall triplet yield via intramolecular SF and subsequent triplet‐pair diffusion can be as high as 142±10 % in thin film.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v129.32
DOI:
10.1002/ange.201704668
Language:
English
Publisher:
Wiley
Publication Date:
2017
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