Redox-Responsive Viologen-Mediated Self-Assembly of CB[7]-Modified Patchy Particles
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- 作者：Farah Benyettou ; Xiaolong Zheng ; Elizabeth Elacqua ; Yu Wang ; Parastoo Dalvand ; Zouhair Asfari ; John-Carl Olsen ; Dong Suk Han ; Na’il Saleh ; Mourad Elhabiri ; Marcus Weck ; Ali Trabolsi
- 刊名：Langmuir
- 出版年：2016
- 出版时间：July 19, 2016
- 年：2016
- 卷：32
- 期：28
- 页码：7144-7150
- 全文大小：420K
- 年卷期：0
- ISSN：1520-5827
文摘
Sulfonated surface patches of poly(styrene)-based colloidal particles (CPs) were functionalized with cucurbit[7]uril (CB[7]). The macrocycles served as recognition units for diphenyl viologen (DPVp>2+ p>), a rigid bridging ligand. The addition of DPVp>2+ p> to aqueous suspensions of the particles triggered the self-assembly of short linear and branched chainlike structures. The self-assembly mechanism is based on hydrophobic/ion-charge interactions that are established between DPVp>2+ p> and surface-adsorbed CB[7]. DPVp>2+ p> guides the self-assembly of the CPs by forming a ternary DPVp>2+ p>⊂(CB[7])2 complex in which the two CB[7] macrocycles are attached to two different particles. Viologen-driven particle assembly was found to be both directional and reversible. Whereas sodium chloride triggers irreversible particle disassembly, the one-electron reduction of DPVp>2+ p> with sodium dithionite causes disassembly that can be reversed via air oxidation. Thus, this bottom-up synthetic supramolecular approach allowed for the reversible formation and directional alignment of a 2D colloidal material.