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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.