Electrochemical behaviour of N-aminopyridinium, and the viologens N,N′-diamino-4,4′-bipyridilium and N,N′-bis(4-aminophenyl)-4,4′-bipyridilium in aqueous acid:

Monk, Paul; Hodgkinson, Neil M.

doi:10.1016/s0022-0728(98)00388-x

Cited by 3 publications

(6 citation statements)

References 29 publications

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“…These results indicate that water plays an important role in stabilizing the radical species, and aqueous conditions are essential to maintain its capture properties. The stability of similar kinds of radical species in an aqueous system has been reported. , …”

Section: Resultsmentioning

confidence: 96%

“…The stability of similar kinds of radical species in an aqueous system has been reported. 28,29 Cyclic voltammetry (CV) was conducted to probe the mechanism of this process, as depicted in Figure 2c. One electron reduction of 1-AP nitrate (1, black curve) in water at a concentration of 20 mM under a nitrogen atmosphere shows a quasi-reversible wave with a reductive peak potential at −0.45 V vs Ag/AgCl and an oxidative peak potential at −0.32 V vs Ag/ AgCl, which indicates that the 1-APyl radical 2 is stable in water at room temperature.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Stable pyridinyl radicals have been discovered but have not been explored as much as redox switches, in contrast to bipyridine, which has been one of the most popular redox switches in many areas of research . In 1998, Monk and Hodgkinson reported that the 1-aminopyridinium (1-AP) cation could generate a stable, uncharged, radical species under acidic conditions by electrochemical reduction . However, further electrochemical studies have not been carried out to any great extent.…”

Section: Introductionmentioning

confidence: 99%

“…27 In 1998, Monk and Hodgkinson reported that the 1-aminopyridinium (1-AP) cation could generate a stable, uncharged, radical species under acidic conditions by electrochemical reduction. 28 However, further electrochemical studies have not been carried out to any great extent. We hypothesized that electrochemical control of the nucleophilicity of the 1-AP cation and its 1aminopyridinyl (1-APyl) radical in an aqueous solution should enable the reversible electrochemical capture and release of CO 2 .…”

Section: ■ Introductionmentioning

confidence: 99%

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Electrochemical Carbon Dioxide Capture and Release with a Redox-Active Amine

2022

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Anthropogenic carbon dioxide (CO2) emission from the combustion of fossil fuels is a major contributor to global climate change and ocean acidification. The implementation of carbon capture and storage technologies has been proposed to mitigate the buildup of this greenhouse gas in the atmosphere. Among these technologies, direct air capture is regarded as a plausible CO2 removal tool whereby net negative emissions can be achieved. However, the separation of CO2 from air is particularly challenging due to the ultradilute concentration of CO2 in the presence of high concentrations of dioxygen and water. Here, we report a robust electrochemical redox-active amine system demonstrating a high electron utilization (i.e., mole of CO2 per mole of electrons) of up to 1.25 with the capture of two CO2 molecules per amine in an aqueous solution with a work of 101 kJe per moles of CO2. The capture of CO2 directly from ambient air as the feed gas presented an electron utilization of 0.78.

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Section: Resultsmentioning

confidence: 96%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Electrochemical Carbon Dioxide Capture and Release with a Redox-Active Amine

2022

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“…[10,[16][17][18][19] Bipyridinium dications have three characteristic redox states attributed to the dication (transparent), the radical cation (blue-violet), and the neutral compound, respectively. [16,[20][21][22][23][24] Previously, our group reported the preparation and application of different di-and tetrasubstituted bipyridinium salts as efficient electrochromic materials [25][26][27][28] presenting higher chromatic contrast and coloration efficiencies. [28] Herein, an innovative combination of bipyridinium derivative [(C 10 ) 2 Bpy] 2+ as electrochromic di-cation and DTE derivative [DTE] 2− like photo and electrochromic dianion has been developed.…”

Section: Introductionmentioning

confidence: 99%

Photo‐electrochromic salt composed by viologen cation and diarylethene anion derivatives

Cruz

Jordão

Santiago

et al. 2022

Electrochemical Science Adv

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A multi‐responsive photo and electrochromic salt based on a viologen derivative ([(C10)2Bpy]2+) as organic cation combined with diarylethene anion ([DTE]2−) is synthesized and characterized for the first time. The coloration of this functional salt can be modulated by light and electricity according to further applications. Photochemical determination of the quantum yields in solution for the ring‐opening and closure of [(C10)2Bpy][DTE‐COO] ionic liquid have been determined. The electrochemical and electrochromism performance have been also studied in order to evaluate the reduction of bipyridinium cation as well as the oxidation of the DTE anion in its open and closed forms. The possibility of individually addressing the redox state of the anion and cation is seen as a very attractive approach to designing photo‐electrochromic devices.

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