Pore size dynamics in interpenetrated metal organic frameworks for selective sensing of aromatic compounds.
Pore size dynamics in interpenetrated metal organic frameworks for selective sensing of aromatic compounds.
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DOI：
10.1016/j.aca.2014.02.004
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发表时间：
2014-03
影响因子：
6.2
通讯作者：
M. Myers;A. Podolska;Charles Heath;M. Baker;B. Pejcic
中科院分区：
文献类型：
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作者：
M. Myers;A. Podolska;Charles Heath;M. Baker;B. Pejcic
这种双层互穿金属-有机骨架[Zn 2（bdc）2（dpNDI）]n（bdc = 1，4-苯二甲酸酯，dpNDI = N′N′-二（4-吡啶基）-1，4，5，8-萘二酰亚胺）在吸附化学物质后可发生结构重排，改变其孔结构.对于具有不同尺寸和几何形状的多种分析物的竞争性结合过程，互穿框架将采用使总体结合相互作用最大化的构象。在这项研究中，我们表明，对于二元混合物，有一个较大的甲基化的芳香族化合物，甲苯和对二甲苯，在小的非甲基化苯的高选择性。[Zn 2（bdc）2（dpNDI）] n中的dpNDI部分与这些芳香族化合物形成激基复合物。发射波长取决于允许区分这些化合物的主体-客体CT相互作用的强度。我们表明，吸附选择性特征可以对[Zn 2（bdc）2（dpNDI）] n对环境重要的基于烃的污染物（即，BTEX、PAH）。
The two-fold interpenetrated metal-organic framework, [Zn2(bdc)2(dpNDI)]n(bdc = 1,4-benzenedicarboxylate, dpNDI = N′N′-di(4-pyridyl)-1,4,5,8-naphthalenediimide) can undergo structural re-arrangement upon adsorption of chemical species changing its pore structure. For a competitive binding process with multiple analytes of different sizes and geometries, the interpenetrated framework will adopt a conformation to maximize the overall binding interactions. In this study, we show for binary mixtures that there is a high selectivity for the larger methylated aromatic compounds, toluene andp-xylene, over the small non-methylated benzene. The dpNDI moiety within [Zn2(bdc)2(dpNDI)]nforms an exciplex with these aromatic compounds. The emission wavelength is dependent on the strength of the host-guest CT interaction allowing these compounds to be distinguished. We show that the sorption selectivity characteristics can have a significant impact on the fluorescence sensor response of [Zn2(bdc)2(dpNDI)]ntowards environmentally important hydrocarbons based contaminants (i.e., BTEX, PAH).