Two-electron transfer stabilized by excited-state aromatization.

Abstract:

: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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Kim J,Oh J,Park S,Zafra JL,DeFrancisco JR,Casanova D,Lim M,Tovar JD,Casado J,Kim D

doi

10.1038/s41467-019-12986-w

subject

Has Abstract

pub_date

2019-11-01 00:00:00

pages

4983

issue

1

issn

2041-1723

pii

10.1038/s41467-019-12986-w

journal_volume

10

pub_type

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