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Polarity-Induced Excited-State Intramolecular Proton Transfer (ESIPT) in a Pair of Supramolecular Isomeric Multifunctional Dynamic Metal-Organic Frameworks.
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2019-08-28 , DOI: 10.1002/chem.201902673
Arijit Halder 1 , Biswajit Bhattacharya 1 , Fazle Haque 1 , Susanta Dinda 1 , Debajyoti Ghoshal 1
Affiliation  

A pair of supramolecular isomers of CdII -based MOF have been synthesized by utilizing a flexible N,N'-donor linker and a dicarboxylate with ESIPT (excited-state intramolecular proton transfer) fluorophore by varying the reaction media. One of the MOFs has a 3D four-fold interpenetrating framework with guest solvent in the structure that undergoes a solvent-dependent crystalline-to-crystalline structural transformation, which has been extensively studied by powder XRD and IR spectroscopy. The other MOF is structurally rigid in nature and has a two-fold interpenetrating structure without any guest molecules. Both the compounds show moderate CO2 adsorption and one of them, the MOF with the four-fold interpenetrating structure, also shows moderately high H2 adsorption. Furthermore, both the compounds show interesting luminescence behavior. In the solid state, the two compounds show single-peak spectra, whereas upon suspension of these compounds in polar solvents, the maxima split into two peaks with a large Stokes shift. On the other hand, in nonpolar solvents, only one emission maximum is observed. This solvatochromic dual-emission phenomenon is due to ESIPT, which has been extensively studied.

中文翻译:

一对超分子异构体多功能动态金属有机骨架中的极性诱导的激发态分子内质子转移(ESIPT)。

通过利用灵活的N,N'-供体接头和带有ESIPT(激发态分子内质子转移)荧光团的二羧酸酯,通过改变反应介质,合成了基于CdII的MOF的一对超分子异构体。一种MOF具有3D四重互穿框架,结构中的客体溶剂经历了溶剂依赖性的晶体到晶体的结构转变,这已经通过粉末XRD和IR光谱进行了广泛研究。另一个MOF本质上在结构上是刚性的,并且具有两个互穿结构,而没有任何客体分子。两种化合物均显示出中等程度的CO2吸附,其中之一是具有四重互穿结构的MOF,也显示出中等程度的H2吸附。此外,这两种化合物均显示出令人感兴趣的发光行为。在固态下,这两种化合物显示出单峰光谱,而将这些化合物悬浮在极性溶剂中时,最大值分裂成两个峰,并具有较大的斯托克斯位移。另一方面,在非极性溶剂中,仅观察到一个最大发射。这种溶剂化双发射现象是由于ESIPT引起的,该现象已被广泛研究。
更新日期:2019-08-28
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