Multichromic Monolayer Terpyridine-Based Electrochromic Materials

Abstract

The article describes novel electrochromic materials (ECMs) that are based on a monolayer consisting of two or three isostructural metal complexes of 4′-(pyridin-4-yl)-2,2’:6′,2’’-terpyridine simultaneously deposited on surface-enhanced support. The support was made by screen printing of indium tin oxide (ITO) nanoparticles on ITO-glass and has a surface area sufficient for a monolayer to give color visible to the naked eye. The ability to separately electrochemically address the oxidation state of the metal centers on the surface (i.e., Co2+/Co3+, Os2+/Os3+, and Fe2+/Fe3+) provides an opportunity to achieve several distinct color-to-color transitions, thus opening the door for constructing monolayer-based multicolor ECMs.

Probing the Influence of Counter Electrode Structure on Electrochromic‐Device Operating Potentials and Performance Using Electrochemical Impedance Spectroscopy

“…Due to the necessity of these components in a functioning ECD, it is vital to assess and optimize their stability and performance. While the impact of the ligand, [4] metal, [27][28] and the support [29] of the WE on the properties of ECDs have been previously investigated, the influence of the CE was not explored in detail.…”

Electrochromism or Water Splitting in Neutral Aqueous Solutions by a Metallo‐Organic Assembly

“…[38,39] Higuchi, Li, Kurth, Nishihara, Zenkina, Zharnikov, and others have studied related materials and demonstrated some of these functionalities. [40][41][42][43][44][45][46][47] However, the electrocatalytic properties of these MAs have not been explored. DOI: 10.1002/ente.202100769 Herein, two different functionalities of one metallo-organic film assembled on the surface of a transparent metal-oxide electrode are described.…”

Crystals versus Electrochromic Films: Pathway-Dependent Coordination Networks

“…Metal-pyridine coordination chemistry has also been used for the generation of self-assembled structures in solution and on surface. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] Although the interaction between metals and pyridine is weaker than with carboxylic acids, stable and functional materials can be isolated. Examples include cages, [18][19][20][21][22] MOFs, [23][24][25] and thin films.…”

“…Examples include cages, [18][19][20][21][22] MOFs, [23][24][25] and thin films. [26][27][28][29][30][31][32][33][34][35] The control of material properties by external stimuli (e.g., light, voltage) has resulted in diverse functionalities, including memory elements, 16,17 biomedical applications, 21 and electrochromism. [26][27][28][29][30][31][32][33][34][35] Structures and functionalities of supramolecular assemblies formed in solution or on surfaces are difficult to predict.…”

“…[26][27][28][29][30][31][32][33][34][35] The control of material properties by external stimuli (e.g., light, voltage) has resulted in diverse functionalities, including memory elements, 16,17 biomedical applications, 21 and electrochromism. [26][27][28][29][30][31][32][33][34][35] Structures and functionalities of supramolecular assemblies formed in solution or on surfaces are difficult to predict. Assemblies formed from the same starting materials can have the same or different molecular arrangements and function.…”