In recent years microporous polymer networks have gained considerable interest.These networks are template-free synthesized and exclusively formed from organic compounds,therefore an exquisite control over the chemical nature of the high accessible surface areas as well as the physical properties of the resulting networks is allowed.This versatility makes such materials highly interesting for various applications.One example is microporous polymer networks with charged backbones.The free counter ions of the anionic networks can be easily exchanged which makes those materials suitable for ion conductivity,[1] while the networks with cationic backbones are interesting for CO2 storage.[2] On the other hand,heptazine-based microporous polymers can be used as photocatalyst for hydrogen evolution from water,even under visible light irradiation.The synthesis at room temperature brings a significant benefit in terms of processing and controlled structural synthesis modifications compared with photocatalysts prepared at higher temperatures.[3]