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

57 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

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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