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Mechanochromic MOF nanoplates: spatial molecular isolation of light-emitting guests in a sodalite framework structure

机译：Mechanochromic MOF nanoplates:空间分子隔离的方钠石发光的客人框架结构

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摘要

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 reversible arrow 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.
机译：有一个广泛的Mechanochromic材料有前途的技术应用,如photonics-based传感器和智能光电子学。然而,有机框架(MOF)材料在文献中仍相对罕见。在此,我们提出一个之前从未描述Guest@MOF体系comprising Perylene@ZIF-8”nanoplates,将于442年进行可逆的纳米可逆箭头502纳米光电发射当受到适度转换在几个数万mechanically-induced压力MPa。高浓度的反应(HCR)策略环境条件产生水晶ZIF-8框架承载苝醌类化合物发光的客人。后者在多孔方钠石ZIF-8的笼子里。固态条件下,空间隔离和nano-partitioning发光的客人给的独一无二的溶液的光学特性测量主-客体组装。可切换的红色或blue-shifts可见可以通过机械排放修改nanoplates的纳米填料(如巨石,颗粒)。计算表明,弹性的主机的方钠石笼加上分子间弱相互作用的局限客人负责的mechanochromic发光行为观察。

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