Smart stimuli-responsive spherical nanostructures constructed from supramolecular metallodendrimers via hierarchical self-assembly

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作者：
20141917689905
机构：
[1] Chen, Li-Jun
[2] Zhao, Guang-Zhen
[3] Jiang, Bo
[4] Sun, Bin
[5] Wang, Ming
[6] Xu, Lin
[7] He, Jiuming
[8] Abliz, Zeper
[9] Tan, Hongwei
[10] Li, Xiaopeng
[11] Yang, Hai-Bo
来源：
Yang, H.-B. (hbyang@chem.ecnu.edu.cn) | 1600年 / American Chemical Society卷 / 136期
关键词：
In this article; we present the design and construction of a series of supramolecular poly(benzyl ether) metallodendrimers featuring a well-defined hexagonal metallacycle at their cores via coordination-driven self-assembly. It was found that the second generation metallodendrimer 3c was able to hierarchically self-assemble into the regular vesicle-like structures. These nanoscale vesicles were monodisperse in shape and relatively monodisperse in size as detected in SEM; TEM; AFM; and DLS experiments. Notably; this kind of hierarchically formed vesicle-like nanostructure adopted a discrete metallacycle as the main skeleton; which is obviously different from many previous reports of nanoscale spherical architectures. Moreover; such supramolecular vesicle-like structures could encapsulate some fluorescent molecules; like BODIPY and SRB; etc. By taking advantage of the dynamic nature of metal-ligand bonds; the disassembly and reassembly of the hexagonal cavity core could be reversibly controlled by the addition and removal of bromide ions; resulting in the transition from the vesicles to micelles. Thus; the controlled release of fluorescence dye was successfully realized by the halide-induced vesicles-micelles transition. These findings not only enrich the library of supramolecular metallodenrimers but also provide a new avenue to the construction of novel smart nanomaterials; which have potential application in functional molecules delivery and release. © 2014 American Chemical Society;
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