A metalâorganic framework NPC-5 was synthesized via reaction of a methyl-functionalized ligand 2,4,6-trimethyl benzene-1,3,5-triyl-isophthalate (TMBTI) with Co(NO3)2·6(H2O) under solvothermal conditions. The steric hindrance induced by the methyl groups on the central phenyl ring led to a non-planar configuration of the ligand and further resulted in a small cubicuboctahedron SBB sustained (3, 24)-connected rht network, which comprised three types of cages and exhibited high porosity. Experimental results showed that despite the use of different synthetic methods the same structure was obtained. Gas sorption study of this MOF revealed high CO2 and CH4 uptake capacities and relatively low adsorption enthalpies.
金属有机框架NPC-5是通过甲基官能团2,4,6-三甲基苯-1,3,5-三基-
间苯二甲酸(
TMBTI)与Co(
NO3)2·6(
H2O)在溶剂热条件下反应合成的。中心苯环上的甲基基团引起的空间位阻导致
配体呈非平面构型,并进一步形成由(3,24)连接的rht网络组成的小立方八面体SBB,该网络由三种笼状结构组成,具有高孔隙率。实验结果表明,尽管使用了不同的合成方法,但获得了相同的结构。对这种MOF的气体吸附研究表明,其具有较高的
CO2和
CH4吸收能力以及相对较低的吸附焓。