Enantiopure distorted ribbon-shaped nanographene combining two-photon absorption-based upconversion and circularly polarized luminescence

Herein we describe a distorted ribbon-shaped nanographene exhibiting unprecedented combination of optical properties in graphene-related materials, namely upconversion based on two-photon absorption (TPA-UC) together with circularly polarized luminescence (CPL). The compound is a graphene molecule o...

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Veröffentlicht in:Chemical science (Cambridge) 2018, Vol.9 (16), p.3917-3924
Hauptverfasser: Cruz, Carlos M, Márquez, Irene R, Mariz, Inês F. A, Blanco, Victor, Sánchez-Sánchez, Carlos, Sobrado, Jesús M, Martín-Gago, José A, Cuerva, Juan M, Maçôas, Ermelinda, Campaña, Araceli G
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Sprache:eng
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Zusammenfassung:Herein we describe a distorted ribbon-shaped nanographene exhibiting unprecedented combination of optical properties in graphene-related materials, namely upconversion based on two-photon absorption (TPA-UC) together with circularly polarized luminescence (CPL). The compound is a graphene molecule of ca. 2 nm length and 1 nm width with edge defects that promote the distortion of the otherwise planar lattice. The edge defects are an aromatic saddle-shaped ketone unit and a [5]carbohelicene moiety. This system is shown to combine two-photon absorption and circularly polarized luminescence and a remarkably long emission lifetime of 21.5 ns. The [5]helicene is responsible for the chiroptical activity while the push-pull geometry and the extended network of sp 2 carbons are factors favoring the nonlinear absorption. Electronic structure theoretical calculations support the interpretation of the results. Including defects in a ribbon-shaped nanographene leads to a new combination of optical properties: TPA-based upconversion and CPL.
ISSN:2041-6520
2041-6539
DOI:10.1039/c8sc00427g