TY - JOUR
T1 - Photoliquefiable ionic crystals
T2 - A phase crossover approach for photon energy storage materials with functional multiplicity
AU - Ishiba, Keita
AU - Morikawa, Masa Aki
AU - Chikara, Chie
AU - Yamada, Teppei
AU - Iwase, Katsunori
AU - Kawakita, Mika
AU - Kimizuka, Nobuo
N1 - Publisher Copyright:
© 2015 Wiley-VCH Verlag GmbH & Co. KGaA.
PY - 2015/1/26
Y1 - 2015/1/26
N2 - Ionic crystals (ICs) of the azobenzene derivatives show photoinduced IC-ionic liquid (IL) phase transition (photoliquefaction) upon UV-irradiation, and the resulting cis-azobenzene ILs are reversibly photocrystallized by illumination with visible light. The photoliquefaction of ICs is accompanied by a significant increase in ionic conductivity at ambient temperature. The photoliquefaction also brings the azobenzene ICs further significance as photon energy storage materials. The cis-IL shows thermally induced crystallization to the trans-IC phase. This transition is accompanied by exothermic peaks with a total ΔH of 97.1 kJmol-1, which is almost double the conformational energy stored in cisazobenzene chromophores. Thus, the integration of photoresponsive ILs and self-assembly pushes the limit of solar thermal batteries.
AB - Ionic crystals (ICs) of the azobenzene derivatives show photoinduced IC-ionic liquid (IL) phase transition (photoliquefaction) upon UV-irradiation, and the resulting cis-azobenzene ILs are reversibly photocrystallized by illumination with visible light. The photoliquefaction of ICs is accompanied by a significant increase in ionic conductivity at ambient temperature. The photoliquefaction also brings the azobenzene ICs further significance as photon energy storage materials. The cis-IL shows thermally induced crystallization to the trans-IC phase. This transition is accompanied by exothermic peaks with a total ΔH of 97.1 kJmol-1, which is almost double the conformational energy stored in cisazobenzene chromophores. Thus, the integration of photoresponsive ILs and self-assembly pushes the limit of solar thermal batteries.
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U2 - 10.1002/anie.201410184
DO - 10.1002/anie.201410184
M3 - Article
AN - SCOPUS:84921666460
SN - 1433-7851
VL - 54
SP - 1532
EP - 1536
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 5
ER -