Redox-Responsive Viologen-Mediated Self-Assembly of CB[7]-Modified Patchy Particles

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

Research output: Contribution to journalArticlepeer-review


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 (DPV2+), a rigid bridging ligand. The addition of DPV2+ 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 DPV2+ and surface-adsorbed CB[7]. DPV2+ guides the self-assembly of the CPs by forming a ternary DPV2+(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 DPV2+ 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.

Original languageEnglish (US)
Pages (from-to)7144-7150
Number of pages7
Issue number28
StatePublished - Jul 19 2016

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry


Dive into the research topics of 'Redox-Responsive Viologen-Mediated Self-Assembly of CB[7]-Modified Patchy Particles'. Together they form a unique fingerprint.

Cite this