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

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Enantiopure distorted ribbon-shaped nanographene combining two-photon absorption-based upconversion and circularly polarized luminescence†
Chemical Science ( IF 7.6 ) Pub Date : 2018-03-14 00:00:00 , DOI: 10.1039/c8sc00427g
Carlos M Cruz ₁ , Irene R Márquez ₁ , Inês F A Mariz ₂ , Victor Blanco ₁ , Carlos Sánchez-Sánchez ₃ , Jesús M Sobrado ₄ , José A Martín-Gago _{3,

4} , Juan M Cuerva ₁ , Ermelinda Maçôas ₂ , Araceli G Campaña ₁

Affiliation

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 sp² carbons are factors favoring the nonlinear absorption. Electronic structure theoretical calculations support the interpretation of the results.

中文翻译：

对映纯扭曲带状纳米石墨烯结合了基于双光子吸收的上转换和圆偏振发光†

在这里，我们描述了一种扭曲的带状纳米石墨烯，它在石墨烯相关材料中表现出前所未有的光学特性组合，即基于双光子吸收（TPA-UC）和圆偏振发光（CPL）的上转换。该化合物是约的石墨烯分子。2 nm 长和 1 nm 宽，边缘缺陷会促进平面晶格的扭曲。边缘缺陷是芳香鞍形酮单元和[5]碳螺旋烯部分。该系统结合了双光子吸收和圆偏振发光以及 21.5 ns 的超长发射寿命。[5]螺旋烯负责手性光学活性，而推拉几何结构和sp ²碳的扩展网络是有利于非线性吸收的因素。电子结构理论计算支持对结果的解释。

更新日期：2018-03-14

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