Photoliquefiable ionic crystals: A phase crossover approach for photon energy storage materials with functional multiplicity

Keita Ishiba, Masa-Aki Morikawa, Chie Chikara, Teppei Yamada, Katsunori Iwase, Mika Kawakita, Nobuo Kimizuka

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1532-1536
Number of pages5
JournalAngewandte Chemie - International Edition
Volume54
Issue number5
DOIs
Publication statusPublished - Jan 26 2015

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Energy storage
Photons
Azobenzene
Crystals
Ionic Liquids
Ionic liquids
Ionic conductivity
Chromophores
Crystallization
Self assembly
Lighting
Phase transitions
Irradiation
Derivatives
azobenzene
Temperature

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Cite this

Photoliquefiable ionic crystals : A phase crossover approach for photon energy storage materials with functional multiplicity. / Ishiba, Keita; Morikawa, Masa-Aki; Chikara, Chie; Yamada, Teppei; Iwase, Katsunori; Kawakita, Mika; Kimizuka, Nobuo.

In: Angewandte Chemie - International Edition, Vol. 54, No. 5, 26.01.2015, p. 1532-1536.

Research output: Contribution to journalArticle

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