title: 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.
abstract: Three porous (3,24)-connected rht-type metal-organic frameworks (MOFs), [Cu(3)L(H(2)O)(3)]·xsolvents (H(6)L(OH) = 4,4',4"-(hydroxysilanetriyl)tris(triphenyl-3,5-dicarboxylic acid), SDU-6; H(6)L(Me) = 4,4',4"-(methylsilanetriyl)tris(triphenyl-3,5-dicarboxylic acid), SDU-7; H(6)L(iBu) = 4,4',4"-(isobutylsilanetriyl)tris(triphenyl-3,5-dicarboxylic acid), SDU-8), have been successfully prepared from [Cu(2)(COO)(4)] paddlewheel SBUs (secondary building units) and C(3)-symmetric Si-based hexatopic carboxylatelinkers. All porous MOFs are constructed from 3D packing of nanosized cuboctahedral, truncated tetrahedral, and truncated octahedral cages. SDU-6-8 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 N(2), H(2), and CH(4). SDU-6 with -OH as the functional group possesses high CH(4) uptake (172 cm(3) cm(-3) at 35 bar), which is very close to DOE target of 180 cm(3) cm(-3).
authors.affiliation: Key Lab for Colloid and Interface Chemistry of Education Ministry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, People's Republic of China.
authors.forename: XiaoLiang
authors.initials: X
authors.lastname: Zhao
authors.forename: Di
authors.initials: D
authors.lastname: Sun
authors.forename: Shuai
authors.initials: S
authors.lastname: Yuan
authors.forename: Shengyu
authors.initials: S
authors.lastname: Feng
authors.forename: Rong
authors.initials: R
authors.lastname: Cao
authors.forename: Daqiang
authors.initials: D
authors.lastname: Yuan
authors.forename: Suna
authors.initials: S
authors.lastname: Wang
authors.forename: Jianmin
authors.initials: J
authors.lastname: Dou
authors.forename: Daofeng
authors.initials: D
authors.lastname: Sun
mesh_terms: D000327:Adsorption; D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D003998:Dicarboxylic Acids / Q000737:chemistry; D005740:Gases / Q000302:isolation & purification*; D006859:Hydrogen / Q000302:isolation & purification; D008697:Methane / Q000302:isolation & purification; D008958:Models, Molecular; D009584:Nitrogen / Q000302:isolation & purification; D009942:Organometallic Compounds / Q000737:chemistry*; D016062:Porosity; D012821:Silanes / Q000737:chemistry*
chemical_list: D003998:Dicarboxylic Acids; D005740:Gases; D009942:Organometallic Compounds; D012821:Silanes; D003300:Copper; D006859:Hydrogen; D009584:Nitrogen; D008697:Methane