Chen Xi, Sapchenko Sergei, Lu Wanpeng, Li Ming, He Meng, Chen Yinlin, Frogley Mark D, da Silva Ivan, Yang Sihai, Schröder Martin
Department of Chemistry, University of Manchester, Manchester M13 9PL, U.K.
Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, U.K.
Inorg Chem. 2023 Oct 23;62(42):17157-17162. doi: 10.1021/acs.inorgchem.3c02110. Epub 2023 Oct 9.
Metal-organic framework (MOF) materials are attracting increasing interest in the field of electronics due to their structural diversity, intrinsic porosity, and designable host-guest interactions. Here, we report the dielectric properties of a series of robust materials, MFM-300(M) (M = Al, Sc, Cr, Fe, Ga, In), when exposed to different guest molecules. MFM-300(Fe) exhibits the most notable increase in dielectric constant to 35.3 ± 0.3 at 10 kHz upon adsorption of NH. Structural analysis suggests that the electron delocalization induced by host-guest interactions between NH and the MOF host, as confirmed by neutron powder diffraction studies, leads to structural polarization, resulting in a high dielectric constant for NH@MFM-300(Fe). This is further supported by ligand-to-metal charge-transfer transitions observed by solid-state UV/vis spectroscopy. The high detection sensitivity and stability to NH suggest that MFM-300(Fe) may act as a powerful dielectric-based sensor for NH.
金属有机框架（MOF）材料因其结构多样性、固有孔隙率和可设计的主客体相互作用而在电子领域引起了越来越多的关注。在此，我们报告了一系列坚固材料MFM-300（M）（M = Al、Sc、Cr、Fe、Ga、In）在暴露于不同客体分子时的介电性能。MFM-300（Fe）在吸附NH后，在10 kHz时介电常数显著增加至35.3±0.3。结构分析表明，中子粉末衍射研究证实，NH与MOF主体之间的主客体相互作用诱导的电子离域导致结构极化，从而使NH@MFM-300（Fe）具有高介电常数。固态紫外/可见光谱观察到的配体到金属的电荷转移跃迁进一步支持了这一点。对NH的高检测灵敏度和稳定性表明，MFM-300（Fe）可能作为一种强大的基于介电的NH传感器。
