Multi-color electrochromism from coordination nanosheets based on a terpyridine-Fe(<scp>ii</scp>) complex

Yu, Kui; Li, Weijun; Dong, Yujie; Wong, Wai Yeung; Yan, Shuanma; Dai, Yuyu; Zhang, Cheng

doi:10.1039/c9dt02980j

Cited by 47 publications

(36 citation statements)

References 36 publications

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“…Electrochromism, the phenomenon of bias‐induced reversible color change, is one of the most exploratory areas. [ 1–12 ] Any material may have electrochromic (EC) properties [ 13 ] but only the ones with appreciable switching time, [ 14 ] coloration efficiency, [ 15 ] contrast ratio, [ 16 ] and quality factor may be used in an actual device in smart windows, displays, etc. and often depend upon the active materials’ properties.…”

Section: Introductionmentioning

confidence: 99%

Chronopotentiometric Deposition of Nanocobalt Oxide for Electrochromic Auxiliary Active Electrode Application

Pathak

Chaudhary

Tanwar

et al. 2020

Physica Status Solidi (a)

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A dense nanofilm of Co 3 O 4 is synthesized using constant current electrodeposition on a conducting transparent electrode that works not only as a counter electrode but also shows electrochromic (EC) properties on its own. The isolated active nano-Co 3 O 4 electrode shows reduction in the redox potential and good color contrast between its yellowish transparent and dark states at different bias conditions. The electrode shows improved color contrast, stability, and cycle life. In situ spectroelectrochemical studies of the nanoelectrode reveals that the biasinduced redox activity of the metal oxide leads to the color change between yellowish and opaque states. The bias-induced color change makes it an active EC counter-ion electrode for appropriate solid-state EC devices.

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Section: Introductionmentioning

confidence: 99%

Chronopotentiometric Deposition of Nanocobalt Oxide for Electrochromic Auxiliary Active Electrode Application

Pathak

Chaudhary

Tanwar

et al. 2020

Physica Status Solidi (a)

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“…When the positive potential was applied to poly-1 the disappearance of the MLCT band was observed (Figure 7A). It was concomitant with the formation of ligand-to-metal charge transfer (LMCT) band with the absorption maxima in the ultraviolet region, below 350 nm [38][39][40]. It was the result of electrooxidation of Fe(II) ions and formation of the Fe(III) complex on ITO surface.…”

Section: Resultsmentioning

confidence: 98%

“…in the ultraviolet region, below 350 nm [38][39][40]. It was the result of electrooxidation of Fe(II) ions and formation of the Fe(III) complex on ITO surface.…”

Section: Resultsmentioning

confidence: 99%

Reductive Electropolymerization and Electrochromism of Iron(II) Complex with Styrene-Based Ligand

et al. 2021

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The benzimidazole-based ligand containing polymerizable styrene group has been prepared via condensation of picolinaldehyde derivative containing styrene moiety and benzimidazole-based hydrazine. The ligand reacted with iron(II) tetrafluoroborate and iron(II) trifluoromethanesulfonate giving red-brown complexes of Fe(II) ions of formula [FeL2]X2, where X = CF3SO3− (1) or BF4− (2). Reductive electropolymerization was used to obtain a thin layer of the polymeric complex, poly-1. Further investigation of electrochemical properties of the compound by cyclic voltammetry showed two quasi-reversible redox processes assigned to electrooxidation and electroreduction of the polymer. Spectroelectrochemical measurements confirmed that the polymer undergoes the color changes during oxidation and reduction process. The polymer in its neutral state (Fe(II)) is yellow and it exhibits absorption band at 370 nm, after oxidation to Fe(III) state absorption band shifts to 350 nm and the polymer is almost colorless. While the metal ions are reduced to Fe(I) absorption band at around 410 nm has been observed and the polymer changed its color to intense yellow. The stability of the polymer during multiple oxidation/reduction cycles has also been investigated.

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“…One of the most important parameters for the characterization of EC materials is coloration efficiency, CE = ∆OD/Q, defined as the difference in optical density ∆OD = log (T b /T c ) per unit charge density Q measured at the λ max of the optical absorption band [38][39][40]. We adopted the approach suitable for not fully bleached EC materials [41] and used the Q values needed to achieve a 95% final transmittance change to calculate the CE values (see Figure S14). The remaining 5% is barely visible to the naked eye.…”

Section: Electrochromism Of Prepared Mspsmentioning

confidence: 99%

“…This value is very competitive compared to other materials reported in the literature for electrochromic devices. For example, Mondal [40] and Kuai [41] reported CE values between 12.84 and 230 cm 2 C −1 for their Fe(II) coordination nanosheets, Kuo et al [38] achieved CE = 372.7 cm 2 C −1 for copolymer composed of carbazole and indole-6-carboxylic acid.…”

Section: Electrochromism Of Prepared Mspsmentioning

confidence: 99%

Iron (II) Metallo-Supramolecular Polymers Based on Thieno[3,2-b]thiophene for Electrochromic Applications

et al. 2021

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Four new bis(tpy) unimers with different linkers between the thieno[3,2-b]thiophene-2,5-diyl central unit and terpyridine-4′-yl (tpy) end-groups: no linker (Tt), ethynediyl (TtE), 1,4-phenylene (TtPh) and 2,2′-bithophene-5,5′-diyl (TtB) are prepared, characterized, and assembled with Fe2+ ions to metallo-supramolecular polymers (Fe-MSPs). The Fe-MSP films prepared by spin-casting on Indium Tin Oxide (ITO) glass are characterized by atomic force microscope (AFM) microscopy, cyclic voltammetry, and UV/vis spectroscopy and studied for their electrochromism and effect of the unimer structure on their electrochromic performance. Of the studied MSPs, Fe-Tt shows the highest optical contrast as well as coloration efficiency (CE = 641 cm2 C−1) and the fastest optical response. This makes it an excellent candidate for possible use in electrochromic devices.

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Multi-color electrochromism from coordination nanosheets based on a terpyridine-Fe(ii) complex

Abstract: A new metal complex electrochromic nanosheet with multiple color electrochromism, fast switching speed and excellent cyclic stability was prepared controllably by the liquid–liquid interface self-assembly method.

Cited by 47 publications

References 36 publications

Chronopotentiometric Deposition of Nanocobalt Oxide for Electrochromic Auxiliary Active Electrode Application

Chronopotentiometric Deposition of Nanocobalt Oxide for Electrochromic Auxiliary Active Electrode Application

Reductive Electropolymerization and Electrochromism of Iron(II) Complex with Styrene-Based Ligand

Iron (II) Metallo-Supramolecular Polymers Based on Thieno[3,2-b]thiophene for Electrochromic Applications

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