【摘要】 本文通过Sonogashira-Hagihara反应制备了两种骨架含有偶氮官能团的多孔芳香骨架材料,PAF-36和PAF-37,并研究了它们的氮气及二氧化碳吸附性能.偶氮官能团经过紫外光照射和加热可以实现顺式和反式结构变换.它们初始BET比表面积分别是325 m2g-1和443 m2g-1.经过紫外光照,偶氮官能团发生顺反异构化,材料的BET比表面积以及在6?和8?的孔径分布均有所增大.另外,紫外光照后,材料的CO2吸附性能也有一定提高.对样品进行了三次紫外/加热循环实验后,样品CO2吸附量几乎保持不变,表明材料中可以发生顺反异构化的偶氮基团具有高效的开关性能.在多孔材料中引入光控基团,可以有效改变材料的孔结构,进而影响材料的气体分子吸附性能.更多还原

【Abstract】 Two porous aromatic frameworks,PAF-36 and PAF-37,containing azo moieties,were synthesized via Sonogashira–Hagihara coupling reactions. Gas sorption measurements indicated that reversible stimuli-responsive adsorption properties were triggered by ultraviolet(UV) irradiation and heat treatment,because of the presence of azo functional groups. The initial Brunauer–Emmett–Teller(BET) surface areas of PAF-36 and PAF-37 were 325 and 443 m2 g-1,respectively. After UV irradiation,the BET surface areas increased during the trans-cis isomerization process,and the micropore sizes,around 6 and 8 ?,also increased. In addition,the CO2 adsorption capacities increased slightly because of trans-cis conversion of azo groups. It is worth mentioning that the CO2 uptakes of the polymers were almost constant during multiple cycles of alternating external stimuli,displaying high switchability of the trans-cis isomerization.更多还原