Smart Stimuli-Responsive Spherical Nanostructures Constructed from Supramolecular Metallodendrimers via Hierarchical Self-Assembly
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- 作者：Li-Jun Chen ; Guang-Zhen Zhao ; Bo Jiang ; Bin Sun ; Ming Wang ; Lin Xu ; Jiuming He ; Zeper Abliz ; Hongwei Tan ; Xiaopeng Li ; Hai-Bo Yang
- 刊名：Journal of the American Chemical Society
- 出版年：2014
- 出版时间：April 23, 2014
- 年：2014
- 卷：136
- 期：16
- 页码：5993-6001
- 全文大小：479K
- 年卷期：v.136,no.16(April 23, 2014)
- ISSN：1520-5126
文摘
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鈥搇igand 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鈥搈icelles transition. These findings not only enrich the library of supramolecular metallodenrimers but also provide a new avenue to the construction of novel 鈥渟mart鈥?nanomaterials, which have potential application in functional molecules delivery and release.