Coordinative supramolecular assembly of electrochromic thin films

The article is concerned with the layer-by-layer (LbL) assembly of electrochromic films using coordinative interactions between compounds. At first the concepts of coordinative supramolecular assembly are explained and examples are presented. Subsequently electrochromic LbL assemblies prepared upon electrostatic and/or coordinative interactions are briefly discussed. In the focus of the article are films of terpyridine(tpy)-functionalized polyiminoarylene metal ion complexes, which are prepared upon coordinative LbL assembly of the tpy-substituted polyiminoarylenes and metal ions. The films exhibit reversible electrochromic behavior with high contrast and fast response times. It is demonstrated that the electrochromic behavior of the films can be modified by a variation of polymer structure, metal ions, and counterions.