Nitrogen-rich aminal linked inorganic–organic hybrid nanoporous materials (HNMs) with cyclophosphazene moieties in the frameworks were synthesized by a Schiff base condensation reaction. The ultra-microporous materials have a specific surface area (S_BET) upto 976 m² g⁻¹ and could capture 18.9 wt% CO₂ and 1.6 wt% H₂ at 273 and 77 K, respectively, at 1 bar. The materials have a nitrogen content upto 42% which is the highest among the nanoporous materials category. The high nitrogen content is beneficial for several applications such as CO₂ capture.