Series of Photoswitchable Azobenzene-Containing Metal–Organic Frameworks with Variable Adsorption Switching Effect,The Journal of Physical Chemistry C

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Series of Photoswitchable Azobenzene-Containing Metal–Organic Frameworks with Variable Adsorption Switching Effect
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2018-08-13 , DOI: 10.1021/acs.jpcc.8b05843
Zhengbang Wang ₁ , Kai Müller , Michal Valášek , Sylvain Grosjean ₂ , Stefan Bräse ₂ , Christof Wöll , Marcel Mayor ₃ , Lars Heinke

Affiliation

Nanoporous metal–organic frameworks (MOFs) equipped with light-responsive azobenzene pendant groups present a novel family of smart materials, enabling advanced applications like switchable guest adsorption, membranes with tunable molecular separation factors, and photoswitchable proton conduction. Although it is obvious that for small pore sizes, steric constraints may prohibit azobenzene switching, guidelines for optimizing the MOF architecture to achieve large switching effects have not yet been established. Here, a series of five different photoswitchable azobenzene-containing pillared-layer MOF structures is presented. The switching effect is quantified by the light-induced increase of the uptake amount of butanol as the probe molecule. For fast and reproducible measurements, thin well-defined MOF films, referred to as surface-mounted MOFs (SURMOFs), were used in combination with a quartz crystal microbalance. Although the series comprises similar MOF structures, the magnitude of the switching effect considerably differs, here by a factor of 5. The uptake data show that, rather than the pore size or the number of azobenzene molecules per pore, the density of azobenzene per pore volume is crucial. The finding that a large switching effect is reached for a high density of azobenzene moieties per MOF unit cell provides the basis for further applications of photoswitchable MOFs and SURMOFs.

中文翻译：

具有可变吸附转换效应的光开关含偶氮苯的金属有机骨架系列

配备有光响应性偶氮苯侧基的纳米孔金属有机骨架（MOF）展示了一种新型的智能材料，可实现先进的应用，例如可转换的客体吸附，具有可调分子分离因子的膜以及可光转换的质子传导。尽管很明显，对于小孔径，空间限制可能会阻止偶氮苯转换，但尚未建立用于优化MOF结构以实现较大转换效果的指南。在这里，提出了五个不同的一系列光可开关的含偶氮苯的柱状MOF结构。通过光诱导丁醇作为探针分子的摄取量的增加来量化转换效果。为了进行快速且可重复的测量，请使用清晰的MOF薄膜，称为表面安装MOF（SURMOF）的设备与石英晶体微量天平结合使用。尽管该系列包含相似的MOF结构，但转换效果的大小却相差很大，此处相差5倍。吸收数据表明，每个孔中偶氮苯的密度而不是孔径或每个孔中偶氮苯分子的数量音量至关重要。每个MOF晶胞中的高密度偶氮苯部分均达到了大的开关效果，这一发现为光开关MOF和SURMOF的进一步应用奠定了基础。而不是孔径或每个孔中偶氮苯分子的数量，每个孔体积中偶氮苯的密度至关重要。每个MOF晶胞中的高密度偶氮苯部分均达到了大的开关效果，这一发现为光开关MOF和SURMOF的进一步应用奠定了基础。而不是孔径或每个孔中偶氮苯分子的数量，每个孔体积中偶氮苯的密度至关重要。每个MOF晶胞中的高密度偶氮苯部分均达到了大的开关效果，这一发现为光开关MOF和SURMOF的进一步应用奠定了基础。

更新日期：2018-08-14

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