New hyper‐cross‐linked porous organic polymers (POPs) with a high content of pyridine segments (7.86 mmol pyridine g−1), and a micro/mesoporous texture are reported. The networks are achieved by the chain‐growth homopolymerization of 2,6‐ and 3,5‐diethynylpyridines. The pyridine segments form links interconnecting the polyacetylene main chains in these networks. The content of pyridine segments in the networks can be tuned by copolymerizing diethynylpyridines with 1,3‐diethynylbenzene. The pyridine rings in the networks serve as base and hydrophilic centers for the sorption of CO2 and water. The homopolymer pyridine networks are highly efficient in the low‐pressure adsorption/desorption of CO2. This sorption mode is promising for the postcombustion removal of CO2 from the fuel gas. The poly(3,5‐diethynylpyridine) network exhibits high efficiency in capturing and releasing water vapor (determined capacity 376 mg g−1 at 298 K and relative humidity (RH) = 90% is one of the highest values reported for POPs) and is a promising material for the cyclic water harvesting from air. The reported networks are characterized by 13C cross‐polarization magic angle spinning NMR, thermogravimetric analysis, and N2 adsorption/desorption and their efficiency in CO2 and H2O capturing is discussed in relation to the content and type of incorporated pyridine segments.
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