Transmissive to blackish-green NIR electrochromism in a Co()-based interfacial co-ordination thin film

Herein, a Co( ii )-based metallo-polymer (Co-tpy-L) with a three armed non-conjugated terpyridine ligand is synthesized using solvent-solvent interfacial polymerization. The thin film exhibits durable transmissive-to-blackish green electrochromism, selectively covering both the visible and NIR regions with a moderate voltage range of −1.4 to 0 V. Non-conjugated terpyridine based Co( ii )-polymeric thin film (Co-tpy-L) showing durable transmissive-to-blackish green UV-to-NIR electrochromism in a moderate voltage range of −1.4 to 0 V was demonstrated.