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Hsu C.-Y.,Electronic Functional Materials Group | Hsu C.-Y.,Japan Science and Technology Agency | Zhang J.,Electronic Functional Materials Group | Zhang J.,Japan International Center for Materials Nanoarchitectonics | And 6 more authors.
ACS Applied Materials and Interfaces | Year: 2015

Black-to-transmissive electrochromism has been obtained with a Co(II)-based metallo-supramolecular polymer (polyCo). Thin films of polyCo, based on bisterpyridine ligand assembled with Co(II) metal ion, were constructed by spray casting the polymer onto ITO glass. With such simple fabricating means to form good-quality films, polyCo films show stable switching at the central metal ion of the Co(II)/Co(I) redox reaction when immersed in aqueous solution. With an increase in the pH of the aqueous electrolyte solution from neutral, the film exhibits a color response due to the interaction between the d-orbital electron and hydroxide ions affecting the d-d∗ transition. As a result, a nearly transparent-to-black electrochromic performance can be achieved with a transmittance difference at 550 nm of 74.3% (81.9-7.6%) in pH 13 solution. The light absorption of the film can be tuned over light regions from visible to near-infrared with a large attenuation. (Graph Presented). © 2015 American Chemical Society.

Hu C.-W.,Japan International Center for Materials Nanoarchitectonics | Sato T.,Electronic Functional Materials Group | Sato T.,Japan Science and Technology Agency | Zhang J.,Electronic Functional Materials Group | And 5 more authors.
Journal of Materials Chemistry C | Year: 2013

A series of Fe/Ru-based bimetallo-supramolecular polymers were synthesized by a stepwise coordination of Fe(ii) and Ru(ii) ions to bis(terpyridyl)benzene (L1). The polymers exhibited multi-colour electrochromic behaviour based on the redox potential of the metal ion. Electrochemical and electrochromic properties of the polymer films were analyzed in acetonitrile with 0.1 M lithium perchlorate as an electrolyte. The polymer films showed high optical contrast and very fast response times, demonstrated by transmittance changes (ΔT) at 508 and 585 nm that were 68% and 37%, respectively, within a few seconds. Coloration efficiencies (η) were established for the first time in a metallo-supramolecular electrochromic system, with values of 242.1 and 188.2 (cm2 C-1) at different wavelengths. © The Royal Society of Chemistry 2013.

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