Chen Yinjie, Li Luhai, Yang Yonggang, Bisoyi Hari Krishna, Jia Yunling, Ju Jing, Huang Shuai, Yu Haifeng, Yang Huai, Li Quan
Beijing Engineering Research Center of Printed Electronics, Beijing Institute of Graphic Communication Beijing 102600 China.
Advanced Materials and Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University Kent OH 44242 USA
RSC Adv. 2020 Sep 30;10(59):35873-35877. doi: 10.1039/d0ra06838a. eCollection 2020 Sep 28.
In this study, organic-inorganic hybrid mesogens of silver nanoparticles (Ag NPs) and azopyridines (AzoPys) enabled by halogen bonding were prepared. Triple functions of the degree of orientation change, metal-enhanced fluorescence, and surface-enhanced Raman scattering were observed in Ag⋯Br-Br⋯AzoPy nanoparticles (12Br-Ag), which were induced by the synthesis of Ag NPs in AzoPy. The bromine molecules were then linked by halogen bonding and electrostatic interaction resulting in the smectic A phase of 12Br-Ag. To demonstrate the potential of Br-Br⋯AzoPy (12Br) as a practical sensor, we used the 12Br compound to detect silver in an aqueous condition, and significant signals of the halogen-bonded complex-silver system were observed in the X-ray diffraction pattern and Raman spectra. Herein, we provide a novel perspective and design principle for the practical applications of organic-inorganic hybrid liquid crystals in environmental monitoring.
在本研究中，制备了通过卤素键合实现的银纳米颗粒（Ag NPs）和偶氮吡啶（AzoPys）的有机-无机杂化液晶基元。在Ag⋯Br-Br⋯AzoPy纳米颗粒（12Br-Ag）中观察到取向变化程度、金属增强荧光和表面增强拉曼散射的三重功能，这是由在AzoPy中合成Ag NPs所诱导的。溴分子随后通过卤素键合和静电相互作用连接，导致12Br-Ag呈现近晶A相。为了证明Br-Br⋯AzoPy（12Br）作为实用传感器的潜力，我们使用12Br化合物在水性条件下检测银，并且在X射线衍射图谱和拉曼光谱中观察到了卤素键合复合物-银体系的显著信号。在此，我们为有机-无机杂化液晶在环境监测中的实际应用提供了一种新的视角和设计原则。
