We reported a supramolecular system consisted of β-cyclodextrin, N,N-dimethylformamide and LiCl, which could exhibit different behaviors toward various alcohols. When some liquid monohydric alcohols were injected into the system at room temperature, a semitransparent organogel (the ambient temperature organogel) was formed. Compared with liquid monohydric alcohols, the addition of solid alcohols could induce the formation of a heat-set organogel, a solution, and an ice-like crystal at different temperatures. The xerogels and dried ice-like crystal were characterized by scanning electron microscope, Fourier transform infrared spectroscopy, X-ray powder diffraction, thermogravimetry and derivative thermogravimetry. The systems were also studied by 1H nuclear magnetic resonance and 2D rotating frame overhauser effect spectroscopy. The alcohol-responsive properties of this system could be further designed as molecule switches based on molecular recognition.
The mechanism of the three-dimensional network formation by self-assembly in the systems: a, LiCl and heat (or liquid monohydric alcohol); b, LiCl, solid alcohol and heat (or cool). We found a novel supramolecular system containing β-cyclodextrin. It was a clear solution at room temperature and could form a heat-set organogel by heating. It could exhibit different behaviors toward various alcohols: ambient temperature organogel, ice-like crystal, heat-set organogel or solution.
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The work was supported by the National Natural Science Foundation of China (NSFC) (Grant No. 20625307), National Basic Research Program of China (973 Program, 2009CB930103) and Shandong Province Natural Science Foundation (No. ZR2009CL022).
Yuehui Hou and Shangyang Li have contributed equally to this work.
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Hou, Y., Li, S., Sun, T. et al. Organogels based on β-cyclodextrin system with molecular recognition property. J Incl Phenom Macrocycl Chem 80, 217–224 (2014). https://doi.org/10.1007/s10847-013-0379-x
- Molecular recognition
- Supramolecular chemistry