Chirality Induction at the Helically Twisted Surface of Nanoparticles Generating Circularly Polarized Luminescence
Chirality Induction at the Helically Twisted Surface of Nanoparticles Generating Circularly Polarized Luminescence
复制标题
DOI：
10.1021/acs.chemmater.2c01994
复制
发表时间：
2022-10
影响因子：
8.6
通讯作者：
Jumpei Kuno;Nicolas Ledos;Pierre‐Antoine Bouit;Tsuyoshi Kawai;M. Hissler;T. Nakashima
中科院分区：
文献类型：
--
作者：
Jumpei Kuno;Nicolas Ledos;Pierre‐Antoine Bouit;Tsuyoshi Kawai;M. Hissler;T. Nakashima
圆偏振发光（CPL）可以由具有手性结构的荧光染料产生，也可以由手性环境中的非手性发光体（例如手性主体或手性自组装体）产生。在此，我们演示了 CPL 对接枝在具有手性形状的无机纳米颗粒 (NP) 上的非手性荧光团的诱导。研究了由具有手性晶体结构的硫化汞（HgS）朱砂相组成的纳米颗粒作为非手性分子自组装成手性排列的平台。 HgS NP 的晶体学和形态手性都被独立考虑用于诱导非手性染料的手性排列。具有椭圆体形状（纳米椭球体）的 HgS 纳米颗粒用非手性荧光染料进行修饰，不会产生 CPL 发射。具有手性扭曲结构（纳米扭曲）的较大 HgS 纳米粒子被发现会产生 CPL。 CPL信号的符号可以通过改变HgS NPs的扭曲方向来调节。手性被认为是在纳米粒子手性扭曲表面上非手性荧光分子的排列或组装中诱导的。
Circularly polarized luminescence (CPL) can be generated either from fluorescent dyes with chiral structures or from achiral luminophores in chiral environments such as chiral hosts or chiral self-assemblies. Herein, we demonstrate the CPL induction to an achiral fluorophore grafted on an inorganic nanoparticle (NP) with a chiral shape. NPs composed of a mercury sulfide (HgS) cinnabar phase with a chiral crystal structure are investigated as a platform on which the achiral molecules self-assemble into a chiral arrangement. Both the crystallographic and morphological chiralities of HgS NPs are independently considered for the induction of a chiral arrangement of achiral dyes. The HgS NPs with an ellipsoidal shape (nanoellipsoids) are modified with the achiral fluorescent dye, resulting in no CPL emission. The larger HgS NPs with a chiral twisted structure (nanotwists) are found to give rise to CPL. The sign of CPL signals could be regulated through the modification of the twist direction of the HgS NPs. Chirality is considered to be induced in the arrangement or assembly of achiral fluorescent molecules on the chirally twisted surface of NPs.