Single photon triggered dianion formation in TCNQ and F(4)TCNQ crystals

Excited state dynamics in two strong organic electron acceptor systems, TCNQ and F(4)TCNQ single crystals, was studied. After absorption of a single photon, dianions are formed in both crystals on ultrashort timescale: TCNQ τ < 50 fs, F(4)TCNQ τ = 4 ps. By use of transient absorption spectroscopy...

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Detalles Bibliográficos
Autores principales: Ma, Lin, Hu, Peng, Jiang, Hui, Kloc, Christian, Sun, Handong, Soci, Cesare, Voityuk, Alexander A., Michel-Beyerle, Maria E., Gurzadyan, Gagik G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4921923/
https://www.ncbi.nlm.nih.gov/pubmed/27346797
http://dx.doi.org/10.1038/srep28510
Descripción
Sumario:Excited state dynamics in two strong organic electron acceptor systems, TCNQ and F(4)TCNQ single crystals, was studied. After absorption of a single photon, dianions are formed in both crystals on ultrashort timescale: TCNQ τ < 50 fs, F(4)TCNQ τ = 4 ps. By use of transient absorption spectroscopy, we demonstrate that the dianion formation in F(4)TCNQ is mediated by the radical anion precursor which is described by a two-step model. Our measurements show the phenomenon that in this quinoid acceptor crystals in the absence of additional donor molecule, it is possible to resolve the two step formation of a doubly charged anion upon absorption of a single low energy photon (2.6 eV).

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