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Mechanochromic MOF nanoplates: spatial molecular isolation of light-emitting guests in a sodalite framework structure†
Nanoscale ( IF 6.7 ) Pub Date : 2018-01-24 00:00:00 , DOI: 10.1039/c7nr09730a
Abhijeet K. Chaudhari 1, 2, 3, 4, 5 , Jin-Chong Tan 1, 2, 3, 4, 5
Affiliation  

Mechanochromic materials have a wide range of promising technological applications, such as photonics-based sensors and smart optoelectronics. The examples of mechanochromic metal–organic framework (MOF) materials, however, are still relatively uncommon in the literature. Herein, we present a previously undescribed Guest@MOF system, comprising “Perylene@ZIF-8” nanoplates, which will undergo a reversible 442 nm ⇌ 502 nm photoemission switching when subjected to a moderate level of mechanically-induced pressure at several tens of MPa. The nanoplates were constructed via high-concentration reaction (HCR) strategy at ambient conditions to yield a crystalline ZIF-8 framework hosting the luminous Perylene guests. The latter confined within the porous sodalite cages of ZIF-8. Remarkably, we show that in a solid-state condition, it is the spatial isolation and nano-partitioning of the luminescent guests that bestow the unique solution-like optical properties measured in the host–guest assembly. As such, we demonstrate that switchable red- or blue-shifts of the visible emission can be accomplished by mechanically modifying the nanoscale packing of the nanoplates (e.g. monoliths, pellets). Theoretical calculations suggest that the elasticity of the host's sodalite cage coupled with the intermolecular weak interactions of the confined guest are responsible for the unique mechanochromic luminescence behavior observed.

中文翻译:

机械变色MOF纳米板:方钠石骨架结构中发光客体的空间分子隔离

机械变色材料具有广泛的应用前景,例如基于光子学的传感器和智能光电。然而,机械变色金属-有机骨架(MOF)材料的例子在文献中仍然相对较少见。本文中,我们介绍了以前未描述的Guest @ MOF系统,该系统包含“ Perylene @ ZIF-8”纳米板,当在数十MPa的压力下施加中等水平的机械感应压力时,它将经历可逆的442 nm⇌502 nm的光发射转换。纳米板是通过高浓度反应(HCR)策略在环境条件下产生晶体ZIF-8框架,该框架容纳发光的Per客体。后者被限制在ZIF-8的多孔方钠石笼中。值得注意的是,我们表明,在固态条件下,发光客体的空间隔离和纳米划分赋予了在主客体组件中测得的独特的类似溶液的光学性质。这样,我们证明了可见发射的可切换红移或蓝移可以通过机械修改纳米板的纳米级堆积来实现(例如整体式,颗粒状)。理论计算表明,寄主方钠石笼的弹性加上受限客体的分子间弱相互作用,是观察到的独特的机械变色发光行为的原因。
更新日期:2018-01-24
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