The complexation and decomplexation of CO2 {with a|having a|using a} series of quinones of {different|various|distinct|diverse|unique|distinctive} basicity {during|throughout|in the course of|for the duration of|through} electrochemical cycling in dimethylformamide {solutions|options} {were|had been|have been} studied systematically by cyclic voltammetry. {In the|Within the|Inside the} absence of CO2, all quinones exhibited two well-separated reduction waves. For weakly complexing quinones, a {positive|good|optimistic|constructive} shift {in the|within the|inside the} second reduction wave was observed {in the|within the|inside the} presence of CO2, corresponding {to the|towards the|for the} dianion quinone-CO2 {complex|complicated} formation. The peak position and peak height {of the|from the|in the|on the|with the|of your} {first|initial|very first|1st|initially} re-duction wave {were|had been|have been} unchanged, indicating no formation of complexes {between|in between|among|amongst|involving} the semiquinones and CO2. The relative heights of {both|each} reduction waves remained {constant|continuous|continual}. {In the|Within the|Inside the} case of strongly complexing quinones, the second reduction wave disappeared {while|whilst|although|even though|when|though} the peak height {of the|from the|in the|on the|with the|of your} {first|initial|very first|1st|initially} reduction wave {approximately|roughly|around|about} doubled, indicating that the two electrons transferred simultaneously at this {potential|possible|prospective}. The observed voltammograms {were|had been|have been} rationalized {through|via|by means of|by way of} {several|a number of|numerous|many|various|quite a few} equilibrium arguments. {Both|Each} weakly and strongly complexing quinones underwent either stepwise or concerted mechanisms of oxidation and CO2 dissociation {depending on|based on|according to} the sweep {rate|price} {in the|within the|inside the} cyclic voltammetric experiments. Relative to stepwise oxidation, the concerted {process|procedure|method|approach|course of action} {requires|demands|needs|calls for} a {more|much more|a lot more|far more|additional|extra} {positive|good|optimistic|constructive} electrode {potential|possible|prospective} to {remove|eliminate|get rid of|take away} the electron {from the|in the} carbonate complexes to release CO2 and regenerate the quinone. For weakly complexing quinones, the stepwise {process|procedure|method|approach|course of action} corresponds to oxidation {of the|from the|in the|on the|with the|of your} uncomplexed dianion and accompanying equilibrium shift, {while|whilst|although|even though|when|though} for strongly complexing quinones the stepwise {process|procedure|method|approach|course of action} would correspond {to the|towards the|for the} oxidation of mono(carbonate) dianion {to the|towards the|for the} complexed semiquinone and accompanying equilibrium shift. This study {provides|offers|gives|supplies|delivers} a mechanistic interpretation {of the|from the|in the|on the|with the|of your} interactions that {lead to|result in|bring about|cause} the formation of quinone-CO2 complexes {required|needed|necessary|essential|expected} for the {potential|possible|prospective} {development|improvement} of an {energy|power} {efficient|effective} electrochemical separation {process|procedure|method|approach|course of action} and discusses {important|essential|crucial|critical|significant|vital} considerations for {practical|sensible} implementation of CO2 capture {in the|within the|inside the} presence of oxygen with {lower|reduce|reduced|decrease} vapor {pressure|stress} solvents. Price of 270065-78-6 2,2-Bis(bromomethyl)-1,3-dioxolane Chemical name PMID:25040798
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