Phase behaviour and heat capacities of 1-butyl-1-methylpyrrolidinium-based ionic liquids with fluoro-sulfonate anions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F22%3A43924288" target="_blank" >RIV/60461373:22340/22:43924288 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.jil.2021.100016" target="_blank" >https://doi.org/10.1016/j.jil.2021.100016</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jil.2021.100016" target="_blank" >10.1016/j.jil.2021.100016</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Phase behaviour and heat capacities of 1-butyl-1-methylpyrrolidinium-based ionic liquids with fluoro-sulfonate anions

Popis výsledku v původním jazyce

yrrolidinium-based ionic liquids belong to the relatively common classes of these compounds; however, there are serious gaps in the knowledge and interpretation flaws of their physico-chemical properties, except for those containing the archetypal bistriflimide [NTf2] anion. Compounds combining the 1-butyl-1-methylpyrrolidinium cation [C4C1Pyrr] with various fluorinated sulfonate anions exhibit vast polymorphism, rendering the thermodynamic description even more complicated. Four 1-butyl-1-methylpyrrolidinium ionic liquids, available commercially in high purities, were subjugated to a combined calorimetric and crystallographic study with a special emphasis on establishing a complete interpretation of their phase behaviour.The samples were dried by vacuum heating and their purity was verified using the Karl Fischer titration and van&apos;t Hoff analysis of the melting peaks. Polymorphism was readily detected for all four compounds, but a complete description of their phase behaviour required an intensive and careful labour. Despite our experimental efforts, some of the polymorphs were found to be too elusive for a complete characterization by any of the used techniques. The obtained phase-transition temperatures and enthalpies were critically compared to the available literature with a variable agreement. While the existing thermodynamic data for [C4C1Pyrr][NTf2] were found complete and sensible, literature data for the other compounds were incomplete or ambiguous. Heat capacities of the four compounds were determined using a Tian-Calvet calorimeter, the results of which were in a good agreement with the existing adiabatic-calorimetric data for [C4C1Pyrr][NTf2]. Several crystal structures were newly resolved within the phase behaviour study and they are reported in the paper.

Název v anglickém jazyce

Phase behaviour and heat capacities of 1-butyl-1-methylpyrrolidinium-based ionic liquids with fluoro-sulfonate anions

Popis výsledku anglicky

yrrolidinium-based ionic liquids belong to the relatively common classes of these compounds; however, there are serious gaps in the knowledge and interpretation flaws of their physico-chemical properties, except for those containing the archetypal bistriflimide [NTf2] anion. Compounds combining the 1-butyl-1-methylpyrrolidinium cation [C4C1Pyrr] with various fluorinated sulfonate anions exhibit vast polymorphism, rendering the thermodynamic description even more complicated. Four 1-butyl-1-methylpyrrolidinium ionic liquids, available commercially in high purities, were subjugated to a combined calorimetric and crystallographic study with a special emphasis on establishing a complete interpretation of their phase behaviour.The samples were dried by vacuum heating and their purity was verified using the Karl Fischer titration and van&apos;t Hoff analysis of the melting peaks. Polymorphism was readily detected for all four compounds, but a complete description of their phase behaviour required an intensive and careful labour. Despite our experimental efforts, some of the polymorphs were found to be too elusive for a complete characterization by any of the used techniques. The obtained phase-transition temperatures and enthalpies were critically compared to the available literature with a variable agreement. While the existing thermodynamic data for [C4C1Pyrr][NTf2] were found complete and sensible, literature data for the other compounds were incomplete or ambiguous. Heat capacities of the four compounds were determined using a Tian-Calvet calorimeter, the results of which were in a good agreement with the existing adiabatic-calorimetric data for [C4C1Pyrr][NTf2]. Several crystal structures were newly resolved within the phase behaviour study and they are reported in the paper.

Druh

J_ost - Ostatní články v recenzovaných periodicích

CEP obor

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OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/GJ19-04150Y" target="_blank" >GJ19-04150Y: Kohezní vlastnosti a fázové rovnováhy iontových kapalin studovány přesnými výpočty a experimenty</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Ionic Liquids

ISSN

2772-4220

e-ISSN

—

Svazek periodika

2

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

15

Strana od-do

100016

Kód UT WoS článku

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EID výsledku v databázi Scopus

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