Switching the Proton Conduction in Nanoporous, Crystalline Materials by Light
Switching the Proton Conduction in Nanoporous, Crystalline Materials by Light
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DOI：
10.1002/adma.201706551
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发表时间：
2018-02-22
影响因子：
29.4
通讯作者：
Heinke, Lars
中科院分区：
文献类型：
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作者：
Mueller, Kai;Helfferich, Julian;Heinke, Lars
质子传导纳米多孔材料在燃料电池、超级电容器、化学传感器和受生物系统启发的信息处理设备中的应用引起了极大的关注。在这里，晶体，纳米多孔材料，提供动态远程控制的质子传导。这是通过使用具有偶氮苯侧基的表面安装的金属有机框架（SURMOFs）来实现的，所述偶氮苯侧基可以在稳定的反式和顺式状态之间进行光诱导的可逆异构化。反式-顺式光异构化导致MOF与客体分子1，4-丁二醇和1，2，3-三唑之间的相互作用的调制;使得能够在具有显著增加的（反式）和降低的（顺式）电导率的状态之间切换。量子化学计算表明，反式到顺式异构化导致客体分子与偶氮基团形成更强的氢桥，导致客体分子之间更强的键合，从而导致更小的质子电导率。可以预见的是，光可切换质子传导材料可以在先进的、远程可控的化学传感器以及基于质子或其他带电分子的导电性的各种设备中找到其应用，这些设备可以与生物系统接口。
Proton conducting nanoporous materials attract substantial attention with respect to applications in fuel cells, supercapacitors, chemical sensors, and information processing devices inspired by biological systems. Here, a crystalline, nanoporous material which offers dynamic remote-control over the proton conduction is presented. This is realized by using surface-mounted metal-organic frameworks (SURMOFs) with azobenzene side groups that can undergo light-induced reversible isomerization between the stable trans and cis states. The trans-cis photoisomerization results in the modulation of the interaction between MOF and guest molecules, 1,4-butanediol and 1,2,3-triazole; enabling the switching between the states with significantly increased (trans) and reduced (cis) conductivity. Quantum chemical calculations show that the trans-to-cis isomerization results in the formation of stronger hydrogen bridges of the guest molecules with the azo groups, causing stronger bonding of the guest molecules and, as a result, smaller proton conductivity. It is foreseen that photoswitchable proton-conducting materials may find its application in advanced, remote-controllable chemical sensors, and a variety of devices based on the conductivity of protons or other charged molecules, which can be interfaced with biological systems.