Journal ArticleDOI
pKa Values of Some Piperazines at (298, 303, 313, and 323) K
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TLDR
In this paper, the dissociation constants of six cyclic diamines were calculated using the potentiometric titration method at (298, 303, 313, and 323) K. The pKa values of piperazine were compared with published data to validate the procedure used.Abstract:
The dissociation constants of the conjugate acids of six cyclic diamines [piperazine, 1-methylpiperazine, 2-methylpiperazine, 1-ethylpiperazine, 1-(2-hydroxyethyl)piperazine, and 1,4-dimethylpiperazine] were calculated using the potentiometric titration method at (298, 303, 313, and 323) K. The pKa values of piperazine were compared with published data to validate the procedure used. The thermodynamic quantities (ΔH° and ΔS°) for the dissociation processes were determined using the van’t Hoff equation. A trend is proposed related to the variation of the pKa with the addition of different radical groups to the base piperazine molecule.read more
Citations
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Assessing the influence of different cation chemistries on ionic conductivity and alkaline stability of anion exchange membranes
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Dissociation Constants (pKa) of Tertiary and Cyclic Amines: Structural and Temperature Dependences
TL;DR: In this article, the dissociation constants of 14 amines were measured over a temperature range between 293.15 and 333.15 K using the potentiometric titration method and the change in standard state thermodynamic properties was derived from the van't Hoff equation.
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Kinetics of carbon dioxide (CO2) with ethylenediamine, 3-amino-1-propanol in methanol and ethanol, and with 1-dimethylamino-2-propanol and 3-dimethylamino-1-propanol in water using stopped-flow technique
TL;DR: Pseudo first order rate constants of homogeneous reactions of carbon dioxide (CO 2 ) with primary amines, ethylenediamine (EDA) and 3-amino-1-propanol (3AP), in methanol and ethanol in the concentration range of 20 −120 m −3, were measured using a stopped-flow apparatus in a temperature range of 293 −313 K as mentioned in this paper.
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Influence of the structure of polyfluorinated alcohols on Brønsted acidity/hydrogen-bond donor ability and consequences on the promoter effect.
Daniela Vuluga,Julien Legros,Benoit Crousse,Alexandra M. Z. Slawin,Christian Laurence,Pierre Nicolet,Danièle Bonnet-Delpon +6 more
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NBD-based synthetic probes for sensing small molecules and proteins: design, sensing mechanisms and biological applications
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References
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Journal ArticleDOI
Individual Activity Coefficients of Ions in Aqueous Solutions
TL;DR: A revised and extended table of ionic activity coefficients, which has largely been computed by independent means, taking into consideration the diameter of the hydrated ions,* as estimated by various methods, is presented in this article.
Journal ArticleDOI
On the kinetics between co2 and alkanolamines both in aqueous and non-aqueous solutions. an overview
TL;DR: In this paper, an overview is presented of the mechanisms that have been proposed in literature and the kinetic data for the various reactions are critically evaluated, along with the applicability and restrictions are discussed along with perspectives.
Journal ArticleDOI
A study on the reaction between CO2 and alkanolamines in aqueous solutions
TL;DR: The results for DEA and DIPA were analyzed by means of a zwitterion-mechanism which was derived from the mechanism originally proposed by Danckwerts as mentioned in this paper.
Journal ArticleDOI
Absorption of carbon dioxide in aqueous piperazine/methyldiethanolamine
Sanjay Bishnoi,Gary T. Rochelle +1 more
TL;DR: In this article, carbon dioxide absorption in 0.6 M piperazine (PZ)/4 M methyldiethanolamine (MDEA) was measured in a wetted wall contactor.
Journal ArticleDOI
Carbon dioxide absorption with aqueous potassium carbonate promoted by piperazine
TL;DR: In this article, the authors presented thermodynamic and kinetic data for aqueous potassium carbonate promoted by piperazine, used as an additive in 20 − 30 wt % potassium carbonates, in a wetted-wall column using a concentration of 06 m at 40 − 80°C.
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