Reversible four-color electrochromism triggered by the electrochemical multi-step redox of Cr-based metallo-supramolecular polymers.

ABSTRACT: Four color electrochromism (yellow, magenta, blue, and navy) has been achieved in Cr(iii)-based metallo-supramolecular polymers (polyCr), which were synthesized by 1 : 1 complexation of Cr ions and 1,4-di[[2,2':6',2''-terpyridin]-4'-yl]benzene (L). The polymer structure was determined by X-ray absorption fine structure (XAFS) measurement and X-ray photoelectron spectroscopy (XPS). The molecular weight of polyCr was calculated as 3.2 × 10⁷ Da using right angle light scattering (RALS). The EXAFS fitting indicated that the bond distances of Cr-N are 2.020 Å and 2.208 Å. A film of polyCr shows multi-color electrochromism (EC) or absorption: a sharp peak at 380 nm at 0 V vs. Ag/Ag⁺ (yellow), a sharp peak at 510 nm and a broad peak at 800 nm at -0.6 V vs. Ag/A

SUBMITTER: Yoshida T 

PROVIDER: S-EPMC9050427 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature