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. 2023 Feb 24;145(9):5431–5438. doi: 10.1021/jacs.2c13743

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Spin resonance of DNA-assembled TIPS-pentacene trimer. (a) Cartoon representation of possible spin species: the exchange-coupled quintet bi-exciton with spin S = 2 (top) and uncoupled triplets each with spin S = 1 (bottom). (b) Map of normalized trESR intensity as a function of static magnetic field and time after a 532 nm laser flash. T = 50 K. Peaks associated with the quintet (S = 2) are highlighted in pink, while peaks associated with the uncoupled triplets (S = 1) are marked in black. (c,d) Time-slice integrated from 200–300 ns in (c) and from 3.5–5 μs in (d) each with corresponding fits to quintet and triplet spectra, respectively (see Supporting Information, Section K). (e,f) Pictorial representation and plot of kinetics observed in time-resolved spin polarization of the absorptive triplet peak highlighted in (c) and the quintet peak highlighted in (d).