Comparison of the Effect of Functional Groups on Gas-Uptake Capacities by Fixing the Volumes of Cages A and B and Modifying the Inner Wall of Cage C in rht-Type MOFs

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• 作者：XiaoLiang Zhao ; Di Sun ; Shuai Yuan ; Shengyu Feng ; Rong Cao ; Daqiang Yuan ; Suna Wang ; Jianmin Dou ; Daofeng Sun
• 刊名：Inorganic Chemistry
• 出版年：2012
• 出版时间：October 1, 2012
• 年：2012
• 卷：51
• 期：19
• 页码：10350-10355
• 全文大小：412K
• 年卷期：v.51,no.19(October 1, 2012)
• ISSN：1520-510X

文摘

Three porous (3,24)-connected rht-type metal鈥搊rganic frameworks (MOFs), [Cu₃L(H₂O)₃]路xsolvents (H₆L^OH = 4,4鈥?4鈥?(hydroxysilanetriyl)tris(triphenyl-3,5-dicarboxylic acid), SDU鈥?; H₆L^Me = 4,4鈥?4鈥?(methylsilanetriyl)tris(triphenyl-3,5-dicarboxylic acid), SDU鈥?; H₆L^iBu = 4,4鈥?4鈥?(isobutylsilanetriyl)tris(triphenyl-3,5-dicarboxylic acid), SDU鈥?), have been successfully prepared from [Cu₂(COO)₄] paddlewheel SBUs (secondary building units) and C₃-symmetric Si-based hexatopic carboxylatelinkers. All porous MOFs are constructed from 3D packing of nanosized cuboctahedral, truncated tetrahedral, and truncated octahedral cages. SDU鈥?鈥? differ only in the functionality of the central Si atom of the hexacarboxylate ligands with hydroxyl, methyl, and isobutyl groups, respectively. Gas adsorption measurements of activated MOFs suggested that decoration of the cage walls with strong polar groups can enhance the adsorption capacities for N₂, H₂, and CH₄. SDU鈥? with 鈭扥H as the functional group possesses high CH₄ uptake (172 cm³ cm^鈥? at 35 bar), which is very close to DOE target of 180 cm³ cm^鈥?.