Three Viologen Compounds Containing Keggin and Mo-Capped Weakley Polyoxometalates: Photo-/Thermo-/Electro-Chromic Studies

Lu, Qinghai; Ying, Jun; Tian, Aixiang; Yang, Mengle

doi:10.1021/acs.cgd.3c01335

Cited by 6 publications

(2 citation statements)

References 44 publications

(70 reference statements)

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“…Furthermore, taking compound 1 as an example, the ultraviolet–visible diffuse reflectance spectra of the test paper before and after detection were compared (Figure S27). It is found that the absorption intensity increases in the whole range of 200–800 nm, and it is speculated that a new charge transfer has been established between compounds and metal ions . This work broadens the application of viologen and POM in the field of ion detection.…”

Section: Resultsmentioning

confidence: 76%

Four Chromic Compounds Constructed from Keggin Polyoxometalates and Viologens with Applications in Ultraviolet, Metal Ion Detection, and Ink-Free Printing

Gao,

Liu,

Ying

et al. 2024

Crystal Growth & Design

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A combination of polyoxometalates and viologens to construct discoloration materials with charge transfer has become attractive presently. In this work, four kinds of POM–viologen color-changing materials were successfully synthesized, namely, [Cu(1,4-Mbby)2(HPMoVI 10MoV 2O40)] (1), [H2(1,4-Mbby)2]·(SiMo12O40) (2, 1,4-Mbby·Cl = (1-(4-methyl-benzyl)-[4,4’]bipyridinyl-1-ium)chloridate), [H2(Bypy)2]·(SiMo12O40) (3), and [H(Bypy)]·(Bypy-2)1/2·(PMo12O40) (4, Bypy = 1-benzyl-4,4′-bipyridyinium chloride, Bypy-2 = 1,1′-dibenzyl-4,4′-bipyridine chloride). In compound 1, a [Cu(1,4-Mbby)2]4+ subunit caps on the Keggin anion to build a monosupporting cluster. Compounds 2–4 are discrete structures with dissociative POMs and viologens. All compounds 1–4 show good reversible photochromic properties under xenon lamp (300–400 nm) irradiation. Under the stimulation of current, compounds 1–4 also show reversible electrochromic properties within a certain range of applied voltage. The good color-changing properties of these compounds are due to the generation of free viologen radicals and charge transfer. Based on their color-changing properties, they can be applied to many fields, such as ultraviolet detectors, inkless printing, and visual detection of heavy metal ions. These practical applications are of positive significance for life and production.

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Section: Resultsmentioning

confidence: 76%

Four Chromic Compounds Constructed from Keggin Polyoxometalates and Viologens with Applications in Ultraviolet, Metal Ion Detection, and Ink-Free Printing

Gao,

Liu,

Ying

et al. 2024

Crystal Growth & Design

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“…Time-dependent solid UV–vis spectra show that its reflectance at 500–700 nm decreases greatly after irradiating for 5 s and continues to gradually decrease with the increase in time (Figure b), corresponding to the characteristic peak of viologen radicals, , indicating the generation of 4PV +• radicals under UV irradiation. The 4PV·2B(Ph) 4 powder can show an obvious photoinduced color change within 5 s and reach the color saturation state in about 30 s, which is more sensitive when compared with other viologen derivatives reported recently (their photochromic responsiveness timescales: 15 s to 5 min). − To investigate the sensitivity of 4PV·2B(Ph) 4 for UV light detection application, power-dependent photochromism has also been performed (Figure c). It can be found that the 4PV·2B(Ph) 4 powder shows an obvious color change with the increase in light intensity (power ranging from 0 to 100 W; each irradiation time is 5 s).…”

Section: Resultsmentioning

confidence: 96%

A Viologen Derivative Transition from Photosilence to Sensitive Photochromism through Ion Exchange

Li,

Huang,

Xue

et al. 2024

Crystal Growth & Design

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Viologen has attracted much attention due to its sensitive chromic properties in response to external stimuli, especially its photochromic behavior. Herein, a viologen derivative, 4PV•2Br, was prepared based on our previous studies, which exhibited strong photoluminescence due to the introduction of the thiazolothiazole group but was silent to light, even under 300 W UV light irradiation. By anion exchange with tetraphenylborate, a new viologen derivative, 4PV•2B(Ph) 4 , was obtained, which not only exhibits strong fluorescence with a quantum yield of 69% and a lifetime of 1.93 ns in solution but also exhibits sensitive photochromism to UV light, even under sunlight within 5 s. It is very sensitive to light and may become a potential excellent solar chromic material. It should be emphasized that the colored 4PV•2B(Ph) 4 radical is particularly stable and can maintain its coloring state in air for a long time, while vinegar vapor can cause it to fade in 2 s, giving it good color reversibility. The single-crystal structure before and after UV light excitation shows that UV light shortens the π•••π distances between B(Ph) 4 anions and 4PV cations, which is beneficial to faster electron transfer between them and the formation of stable viologen radicals. Sensitive photochromism accompanied by strong photoluminescence may endow 4PV•2B(Ph) 4 with potential application in information security and provide a good strategy to regulate the functionality of materials by regulating the counteranions of new viologen derivatives.

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Advances in viologen-based stimulus-responsive crystalline hybrid materials

Li,

et al. 2024

Coordination Chemistry Reviews

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Three Viologen Compounds Containing Keggin and Mo-Capped Weakley Polyoxometalates: Photo-/Thermo-/Electro-Chromic Studies

Cited by 6 publications

References 44 publications

Four Chromic Compounds Constructed from Keggin Polyoxometalates and Viologens with Applications in Ultraviolet, Metal Ion Detection, and Ink-Free Printing

Four Chromic Compounds Constructed from Keggin Polyoxometalates and Viologens with Applications in Ultraviolet, Metal Ion Detection, and Ink-Free Printing

A Viologen Derivative Transition from Photosilence to Sensitive Photochromism through Ion Exchange

Advances in viologen-based stimulus-responsive crystalline hybrid materials

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