| Autor: |
Kim, Jinseok, Oh, Juwon, Park, Seongchul, Zafra, Jose L., DeFrancisco, Justin R., Casanova, David, Lim, Manho, Tovar, John D., Casado, Juan, Kim, Dongho |
| Předmět: |
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| Zdroj: |
Nature Communications; 11/1/2019, Vol. 10 Issue 1, p1-8, 8p |
| Abstrakt: |
The scientific significance of excited-state aromaticity concerns with the elucidation of processes and properties in the excited states. Here, we focus on TMTQ, an oligomer composed of a central 1,6-methano[10]annulene and 5-dicyanomethyl-thiophene peripheries (acceptor-donor-acceptor system), and investigate a two-electron transfer process dominantly stabilized by an aromatization in the low-energy lying excited state. Our spectroscopic measurements quantitatively observe the shift of two π-electrons between donor and acceptors. It is revealed that this two-electron transfer process accompanies the excited-state aromatization, producing a Baird aromatic 8π core annulene in TMTQ. Biradical character on each terminal dicyanomethylene group of TMTQ allows a pseudo triplet-like configuration on the 8π core annulene with multiexcitonic nature, which stabilizes the energetically unfavorable two-charge separated state by the formation of Baird aromatic core annulene. This finding provides a comprehensive understanding of the role of excited-state aromaticity and insight to designing functional photoactive materials. Excited state aromaticity gives rise to unique photophysical properties which may aid the design of functional photoactive materials. Here, the authors spectroscopically characterize an acceptor-donor-acceptor system featuring a two-electron transfer process stabilized by aromatization in the lower energy excited state. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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