Redox-Responsive Viologen-Mediated Self-Assembly of CB[7]-Modified Patchy Particles.
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 (DPV(2+)), a rigid bridging ligand. The addition of DPV(2+) 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 DPV(2+) and surface-adsorbed CB[7]. DPV(2+) guides the self-assembly of the CPs by forming a ternary DPV(2+)⊂(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 DPV(2+) 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.
New York University Abu Dhabi , Abu Dhabi, United Arab Emirates.
Farah
F
Benyettou
Molecular Design Institute and Department of Chemistry, New York University , New York, New York 10003, United States.
Xiaolong
X
Zheng
Molecular Design Institute and Department of Chemistry, New York University , New York, New York 10003, United States.
Elizabeth
E
Elacqua
Molecular Design Institute and Department of Chemistry, New York University , New York, New York 10003, United States.
Yu
Y
Wang
Laboratoire de Chimie Bioorganique et Médicinale, UMR 7509 CNRS, Université de Strasbourg, ECPM , Strasbourg, France.
Parastoo
P
Dalvand
Laboratoire d'Ingénierie Moléculaire Appliquée à l'Analyse, IPHC, UMR 7178 CNRS, Université de Strasbourg, ECPM , 25 rue Becquerel, 67200 Strasbourg, France.
Zouhair
Z
Asfari
School of Sciences, Indiana University Kokomo , Kokomo, Indiana 46904, United States.
John-Carl
JC
Olsen
Chemical Engineering Program, Texas A&M University at Qatar, Education City , Doha, Qatar.
Dong Suk
DS
Han
College of Science, Department of Chemistry, United Arab Emirates University , Al-Ain, United Arab Emirates.
Na'il
N
Saleh
Laboratoire de Chimie Bioorganique et Médicinale, UMR 7509 CNRS, Université de Strasbourg, ECPM , Strasbourg, France.
Mourad
M
Elhabiri
Molecular Design Institute and Department of Chemistry, New York University , New York, New York 10003, United States.
Marcus
M
Weck
New York University Abu Dhabi , Abu Dhabi, United Arab Emirates.
Ali
A
Trabolsi