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Cucurbituril-modulated supramolecular assemblies: from cyclic oligomers to linear polymers
Hai Qian1, Dong-Sheng Guo, Yu Liu
1Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, PR China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|March 13, 2012
Summary
Cucurbit[n]urils (CB[n]) enable topological conversion of supramolecular assemblies from cyclic oligomers to linear polymers using bis(p-sulfonatocalix[4]arenes) and N
Area of Science:
- Supramolecular Chemistry
- Materials Science
- Polymer Chemistry
Background:
- Supramolecular assemblies offer tunable properties based on non-covalent interactions.
- Controlling assembly topology (cyclic vs. linear) is crucial for material function.
- Host-guest chemistry using cucurbiturils provides a platform for molecular recognition and assembly.
Purpose of the Study:
- To investigate the role of cucurbit[n]urils (CB[n]) in modulating supramolecular assembly topology.
- To achieve topological conversion from cyclic oligomers to linear polymers using specific building blocks.
- To explore the redox-responsive behavior of these supramolecular systems.
Main Methods:
- Synthesis and characterization of binary and ternary supramolecular assemblies.
- Utilized techniques including NMR spectroscopy, AFM, TEM, DLS, ITC, GPC, TGA, UV/Vis, and elemental analysis.
- Investigated host-guest interactions between bis(p-sulfonatocalix[4]arenes) (bisSC4A), N',N''hexamethylenebis(1-methyl-4,4'-bipyridinium) (HBV(4+)), and cucurbit[n]urils (CB[n]).
Main Results:
- Binary assemblies of HBV(4+) and bisSC4A formed oligomeric structures.
- Ternary assemblies with CB[8] yielded linear polymers by rigidifying HBV(4+) and reinforcing host-guest interactions.
- CB[8]-based assemblies exhibited redox-responsive disassembly upon reduction of HBV(4+) to HBV(2+), unlike CB[7]-based assemblies.
Conclusions:
- Cucurbit[n]urils, particularly CB[8], effectively control the topological transformation of supramolecular assemblies.
- CB[8] enhances the formation of linear polymers and imparts desirable redox-responsive properties.
- This work demonstrates a strategy for designing stimuli-responsive polymeric materials through host-guest chemistry.
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