Shaanxi Key Laboratory of Natural Products &Chemical Biology, College of Chemistry &Pharmacy, Northwest A&F University, Yangling, Shaanxi, 712100, P. R. China.
Sci Rep. 2017 Feb 27;7:43491. doi: 10.1038/srep43491.
Optical activity of hierarchical supramolecular assemblies based on organic dyes would create multiple functional architectures. In this work, three kinds of silica nanoparticles with or without functional groups were synthesized. For the first time, silica nanoparticles can induce positively charged squaraine (SQ) to aggregate to form supramolecular assemblies. Adenosine-5'-triphosphate (ATP) as building blocks was absorbed on the surface of silica nanoparticles through metal-anion coordination and electrostatic interactions, in which the aggregates of SQ was transferred to monomer. The thickness being composed of ATP and SQ on the outside of nanoparticles is about 5 nm. These supramolecular assemblies showed selective turn-on fluorescence response to ATP in near infrared (NIR) region over other ions through metal-anion coordination and electrostatic interactions. These functional silica nanoparticles possessing many advantages provide proof-of-principle "seed crystals" for construction of supramolecular assemblies and platforms for sensing with facile performance.
基于有机染料的分级超分子组装的旋光性将创造出多种功能结构。在这项工作中，合成了三种具有或不具有官能团的硅纳米粒子。首次发现硅纳米粒子可以诱导带正电荷的方酸（SQ）聚集形成超分子组装体。三磷酸腺苷（ATP）作为构建模块通过金属-阴离子配位和静电相互作用吸附在硅纳米粒子表面，其中 SQ 的聚集物被转化为单体。纳米粒子外表面由 ATP 和 SQ 组成的厚度约为 5nm。这些超分子组装体通过金属-阴离子配位和静电相互作用，在近红外（NIR）区域对 ATP 表现出选择性的开启荧光响应，而对其他离子则没有响应。这些具有多种优点的功能性硅纳米粒子为超分子组装体的构建和具有简便性能的传感平台提供了原理性“晶种”。
