Transfer of Chiral Information from Silica Hosts to Achiral Luminescent Guests: a Simple Approach to Accessing Circularly Polarized Luminescent Systems.,ChemPlusChem

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Transfer of Chiral Information from Silica Hosts to Achiral Luminescent Guests: a Simple Approach to Accessing Circularly Polarized Luminescent Systems.
ChemPlusChem ( IF 3.0 ) Pub Date : 2019-12-13 , DOI: 10.1002/cplu.201900615
Seiji Tsunega ₁ , Ren-Hua Jin ₁ , Takuya Nakashima ₂ , Tsuyoshi Kawai ₂

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Systems that show circularly polarized luminescence (CPL) are usually constructed in one of two possible ways: either covalently binding the chiral moieties (usually organic compounds) to luminophores (inorganic or organic compounds) or associating the luminophores as guests with chiral hosts (usually organic compounds). Herein, we propose inorganic‐based CPL‐active systems constructed by the “chiral host‐luminescent guest” strategy, in which silica acts as a chiral host to endow various luminescent guests with CPL. The chiral silica was modified by silane coupling with amino or phenyl groups to allow interaction with luminescent guests, and then used in combination with acidic achiral dyes, lead‐halide type perovskites, and aggregation‐induced emission luminogens (AIEgens). Interestingly, when these achiral guests were noncovalently confined in surface‐modified chiral silica, the guests showed chiroptical behavior in the circular dichroism (CD) spectra, and thus became CPL active, even though they are not inherently chiral. The surface functional groups on the silica play very important roles in transferring the chiral information from the silica to the guests. This work provides a new concept for constructing CPL‐active systems using inorganic materials as a chiral source.

中文翻译：

从二氧化硅基质向非手性发光客体传递手性信息：一种访问圆偏振发光系统的简单方法。

显示圆偏振发光（CPL）的系统通常以以下两种可能的方式之一构建：将手性部分（通常为有机化合物）与发光体（无机或有机化合物）共价结合，或将作为客体的发光体与手性主体（通常为有机体）缔合化合物）。本文中，我们提出了通过“手性主体-发光客体”策略构建的基于无机的CPL活性系统，其中二氧化硅充当手性主体，为各种发光客体提供CPL。通过硅烷偶联氨基或苯基使手性二氧化硅改性，以使其与发光客体相互作用，然后与酸性非手性染料，卤化铅型钙钛矿和聚集诱导的发光致发光剂（AIEgens）结合使用。有趣的是，当这些非手性客人非共价地限制在表面改性的手性二氧化硅中时，这些客人在圆二色性（CD）光谱中表现出手性行为，因此变为CPL活性，即使它们本身不是手性的。二氧化硅上的表面官能团在将手性信息从二氧化硅传递给客人方面起着非常重要的作用。这项工作为使用无机材料作为手性来源构建CPL活性系统提供了一个新概念。

更新日期：2019-12-13

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