title: Smart stimuli-responsive spherical nanostructures constructed from supramolecular metallodendrimers via hierarchical self-assembly.
abstract: 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.
authors.affiliation: Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University , Shanghai 200062, P. R. China.
authors.forename: Li-Jun
authors.initials: LJ
authors.lastname: Chen
authors.forename: Guang-Zhen
authors.initials: GZ
authors.lastname: Zhao
authors.forename: Bo
authors.initials: B
authors.lastname: Jiang
authors.forename: Bin
authors.initials: B
authors.lastname: Sun
authors.forename: Ming
authors.initials: M
authors.lastname: Wang
authors.forename: Lin
authors.initials: L
authors.lastname: Xu
authors.forename: Jiuming
authors.initials: J
authors.lastname: He
authors.forename: Zeper
authors.initials: Z
authors.lastname: Abliz
authors.forename: Hongwei
authors.initials: H
authors.lastname: Tan
authors.forename: Xiaopeng
authors.initials: X
authors.lastname: Li
authors.forename: Hai-Bo
authors.initials: HB
authors.lastname: Yang
mesh_terms: D003692:Delayed-Action Preparations; D050091:Dendrimers / Q000737:chemistry*; D015195:Drug Design; D006860:Hydrogen Bonding; D008958:Models, Molecular; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D010795:Phthalic Acids / Q000737:chemistry
chemical_list: D003692:Delayed-Action Preparations; D050091:Dendrimers; D009942:Organometallic Compounds; D010795:Phthalic Acids; C032279:phthalic acid