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利用半刚性的三足羧酸配体1,3,5-tris[3-(carboxyphenyl)oxamethyl]-2,4,6-trimethylbenzene acid(H3TBTC)与金属离子自组装成功合成了两例八面体纳米笼构建的金属-有机框架化合物:{[Zn3TBTC2(DMA)(H2O)]3DMA 3H2O}n(1),{[Cd3TBTC2(DMA)2(H2O)2]2DMA 2H2O}n(2).TBTC3-配体在化合物中呈现出cis,cis,cis-和cis,trans,trans-两种构型.cis,cis,cis-构型的TBTC3-配体与Zn3(COO)6次级结构基元(secondary building units,SBUs)构筑了畸变的八面体金属-有机纳米笼,因而化合物的结构可以看成是八面体金属-有机纳米笼作为超分子构建单元(supramolecular building blocks,SBBs),在空间上与cis,trans,trans-构型的配体相连,最终形成具有(3,18)-连接的三维无限网络.荧光测试结果表明,化合物1～2的荧光都是基于配体的发射.相对于配体的发射光谱,化合物1～2的发射光谱展现出蓝移的现象.气体吸附测试结果表明,化合物1～2具有选择性吸附二氧化碳的能力.
Two octahedral nanostructures were successfully synthesized by self-assembly of metal ions with semi-rigid tri-carboxylic acid ligand 1,3,5-tris [3- (carboxyphenyl) oxamethyl] -2,4,6-trimethylbenzene acid Cage Structured Metal-Organic Framework Compounds: {[Zn3TBTC2 (DMA) (H2O)] 3DMA3H2O} n (1), {[Cd3TBTC2 (DMA) 2 (H2O) 2] 2DMA2H2O} n The compounds showed cis, cis, cis- and cis, trans, trans- and cis-, cis-, cis- and cis-cis- building units, SBUs) to construct a distorted octahedral metal-organic nanocage. Therefore, the structure of the compound can be regarded as octahedral metal-organic nanocages as supramolecular building blocks (SBBs) , trans, trans-configuration and finally formed a three-dimensional infinite network with (3,18) -links.Fluorescence test results show that the fluorescence of compounds 1 ~ 2 are all based on the emission of the ligand.Compared with the ligand The emission spectra of compounds 1 and 2 showed a blue-shift phenomenon.The results of gas adsorption tests showed that compounds 1 and 2 have the ability of selectively adsorbing carbon dioxide.