MURAOKA, T.; SHIMA, T.; KAJITANI, T.; HOSHINO, N.; MORVAN, E.; GRELARD, Axelle; DUFOURC, E. J.; FUKUSHIMA, T.; AKUTAGAWA, T.; NABEYA, K.; KINBARA, K.

doi:10.1002/asia.201801372

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Chemistry-an Asian Journal. 2019, vol. 14, n° 1, p. 141-148

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A polymesomorphic thermal phase-transition of a macrocyclic amphiphile consisting of aromatic groups and oligoethylene glycol (OEG) chains is reported. The macrocyclic amphiphile exists in a highly-ordered liquid crystal (LC) phase at room temperature. Upon heating, this macrocycle shows phase-transition from columnar-lamellar to nematic LC phases followed by crystallization before melting. Spectroscopic studies suggest that the thermally induced crystallization is triggered by a conformational change at the OEG chains. Interestingly, while the macrocycle returns to the columnar-lamellar phase after cooling from the isotropic liquid, it retains the crystallinity after cooling from the thermally-induced crystal. Thanks to this bistability, conductance switching was successfully demonstrated. A different macrocyclic amphiphile also shows an analogous phase-transition behavior, suggesting that this molecular design is universal for developing switchable and memorizable materials, by means of hysteretic phase-transition processes.< Leer menos

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amphiphiles

isomerization

liquid crystals

macrocycles

polymorphisms

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Heat-Triggered Crystallization of Liquid Crystalline Macrocycles Allowing for Conductance Switching through Hysteretic Thermal Phase Transitions

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