Study On Synthesis And Characteristics Of Metalloporphyrin Based Porous Ploymer Materials

Organic porous polymer materials?POPs? have large specific surface area and permanent pore structure. Because of their wide range of potential applications in gas storage and separation, heterogeneous catalysis and chemical sensing properties, which caused widespread concern by scientists. POPs possess lower skeletal density, high specific surface area and excellent physical and chemical stability, while a synthetic method diversity. We can select a specific building blocks to design and synthesis the organic porous polymer with a certain structure and properties, thereby obtaining functionalized polymers for application.The paper will present the synthesis of a series of new hyper-crosslinked microporous polymer materials, and the characterizations of the structure and catalytic properties.We describe a novel and intriguing strategy for the construction of efficient heterogeneous catalysts by hyper-crosslinked catalytic molecules via one pot Friedel-Crafts alkylation reaction. First, we synthesized 5,10,15,20-tetraphenylporphyrin iron?III?, then used a facile method for the preparation of hypercrosslinked catalytic molecules via FeCl₃-promoted one-step oxidative coupling reaction and Friedel–Crafts alkylation in one pot. The Brunauer-Emmett-Teller specific surface area of the obtained polymers is up to 735m2 g-1, total pore volume of 0.678 cm3 g-1. We also studied the influence of different ratio of cross-linking agent for surface area. Meanwhile, we introduced different substituents-Br,-OCH₃ group to study the surface area diversification of HCPs. The other three polymers were FeP_p-Br-HCP, FeP_p-OMe-HCP, FeP_o-OMe-HCP. The specific surface area is 418 m2g-1, 902m2 g-1, 977 m2 g-1, respectively.we demonstrated that FeP-HCPs can efficiently catalyze the hetero-Diels-Alder reaction between simple dienes and unactivated aldehydes, which exhibit high activity, and wide substrate adaptability, as well as excellent recyclability, leading to the formation of pyran structural units in high yields. We also examine substrate universality of the catalyst and reuse capabilities. It is noteworthy that the catalyst can be carried out by simple filtration process again and the reaction yield is still high, after recycling five times, the catalytic activity was not significantly decreased. This indicates that the material has a good prospect for industrial application. The new metalloporphyrin-based polymer catalysts combine the advantages of homogeneous and heterogeneous catalysts, owing to their high surface area,good stability and per-tailoring catalytic centers in the networks.