Photoliquefiable Ionic Crystals: A Phase Crossover Approach for Photon Energy Storage Materials with Functional Multiplicity
Photoliquefiable Ionic Crystals: A Phase Crossover Approach for Photon Energy Storage Materials with Functional Multiplicity
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DOI：
10.1002/anie.201410184
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发表时间：
2015-01-26
影响因子：
16.6
通讯作者：
Kimizuka, Nobuo
中科院分区：
文献类型：
--
作者：
Ishiba, Keita;Morikawa, Masa-aki;Kimizuka, Nobuo
偶氮苯衍生物的离子晶体（IC）在紫外光照射下表现出光致IC-离子液体（IL）相变（光致液化），并且所得到的顺式偶氮苯IL在可见光照射下可逆地光致结晶。IC的光液化伴随着在环境温度下离子电导率的显著增加。光致液化也使偶氮苯IC作为光子能量存储材料具有进一步的意义。顺式IL显示热诱导结晶为反式IC相。这种转变伴随着放热峰，总Δ H为97.1 kJmol（-1），这几乎是顺式偶氮苯发色团中储存的构象能的两倍。因此，光响应IL和自组装的集成推动了太阳能热电池的极限。
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 Delta H of 97.1 kJmol(-1), which is almost double the conformational energy stored in cis-azobenzene chromophores. Thus, the integration of photoresponsive ILs and self-assembly pushes the limit of solar thermal batteries.