Increasing Alkyl Chain Length in a Series of Layered Metal–Organic Frameworks Aids Ultrasonic Exfoliation to Form Nanosheets
作者:David J. Ashworth、Thomas M. Roseveare、Andreas Schneemann、Max Flint、Irene Dominguez Bernáldes、Pia Vervoorts、Roland A. Fischer、Lee Brammer、Jonathan A. Foster
DOI:10.1021/acs.inorgchem.9b01128
日期:2019.8.19
form nanosheets, however, remain poorly understood. Here we systematically investigate an isoreticular series of layered MOFs functionalized with alkoxy substituents in order to understand the effect of substituent alkyl chain length on the structure and properties of the resulting nanosheets. A series of 2,5-alkoxybenzene-1,4-dicarboxylate ligands (O2CC6H2(OR)2CO2, R = methyl-pentyl, 1-5, respectively)
金属有机框架纳米片(MONs)作为一种衍生自金属有机框架(MOFs)的二维材料的多样化类别正引起越来越多的关注。然而,分层MOF的设计原理很容易被剥落以形成纳米片,但其原理仍然知之甚少。在这里,我们系统地研究了用烷氧基取代基官能化的层状MOF的等网状系列,以了解取代基烷基链长对所得纳米片结构和性能的影响。使用一系列2,5-烷氧基苯-1,4-二羧酸酯配体(O2CC6H2(OR)2CO2,R =甲基戊基,分别为1-5)合成铜桨轮MOF。化合物Cu(3-5)(DMF)的粉末衍射图的Rietveld和Pawley拟合显示,它们采用具有二维连通性的等网状系列,其中层间距离从8.68Å(R =丙基)增加到10.03Å(R =戊基)。随着链长的增加,MOF对CO2的吸附量从27.2 cm3 g-1增加到40.2 cm3 g-1,这归因于与单位细胞体积增加相关的可到达体积的增加。使用超声波将分层的MOF剥