Main content area

A porphyrin-linked conjugated microporous polymer with selective carbon dioxide adsorption and heterogeneous organocatalytic performances

Liu, Xiaoming, A, Sigen, Zhang, Yuwei, Luo, Xiaolong, Xia, Hong, Li, He, Mu, Ying
RSC advances 2014 v.4 no.13 pp. 6447-6453
adsorption, aldehydes, carbon dioxide, catalytic activity, heterocyclic compounds, ketones, methane, nitrogen, organocatalysts, polymers, porous media
A new porphyrin-based conjugated microporous polymer with rich nitrogen sites in the skeleton has been synthesized by alkyne–alkyne homocoupling reaction. The Brunauer–Emmett–Teller specific surface area up to 662 m² g⁻¹ was obtained for the new polymer framework with a pore volume of 0.55 cm³ g⁻¹. The polymer network displays high carbon dioxide uptake capacity (up to 3.58 mmol g⁻¹) at 273 K and 1 bar, with good selectivity towards CO₂ over N₂ and CH₄. Furthermore, this framework also acts as a solid organocatalyst towards Knoevenagel reaction of malononitrile with aromatic, heterocyclic aldehydes, and cyclic ketones. The reaction afforded the corresponding products in excellent yields (up to 99%) with short times. Moreover, the heterogeneous catalyst was also found to exhibit an excellent recyclability (up to 10 times) without loss of efficiency.