In recent decade, conjugated microporous polymers (CMPs) were treated as one of the superior porous materials for CO 2 uptake. Herein, we prepared two azo-linked CMPs namely: azo-carbazole (Azo-Cz) and azo-phenothiazine (Azo-Tz) from the reduction of the corresponding nitro monomers using sodium borohydride (NaBH 4 ). The obtained polymers were well characterized using many spectroscopic techniques. According to TGA and BET analyses, our CMPs owned good specific surface areas (reaching 315 m 2 g –1 ), and a significant thermal stability. It is also possessed pore sizes of 0.79 and 1.18 nm, respectively, and a reasonable char yields (max. 46 %). Based on CO 2 uptake measurements, the CO 2 adsorption capacities of these CMPs were very good: up to 40 and 94 mg g –1 at the experiment temperatures 298 and 273 K, respectively. The great CO 2 uptake is due to high surface areas that facilitate powerful interactions with CO 2 molecules. Supplementary information The online version contains supplementary material available at 10.1007/s10965-021-02803-8.

Herein, a new π‐electron‐delocalized building block (ProPh‐4CHO) is reported for the construction of a π‐electron‐extended porphyrin/pyrene‐linked covalent organic framework (ProPh‐PyTA‐COF) for use as a saturable absorber (SA) in a Q‐switched all‐solid‐state laser. Employing a mode‐locked fiber laser operated with 130‐fs pulses at 1030 nm and a repetition rate of 28 MHz, ProPh‐PyTA‐COF exhibits remarkable optical nonlinear absorptions: two saturable absorptions with saturation intensities of 92 MW cm−2 and 1 kW cm−2. This material is used to fabricate the first pulsed Q‐switched all‐solid‐state laser incorporating a COF as an absorber. The laser incorporating this COF‐SA exhibited a pump power of 6.5 W with a pulse duration of 1.2 μs, corresponding to a pulse repetition rate of 94.4 kHz. This study not only reveals the possibility of using saturation absorption to pulse a solid‐state laser but also opens up a new path toward optical nonlinearity through the engineering of π‐bond delocalization.