Phase behavior and heat capacities of the 1-benzyl-3-methylimidazolium ionic liquids

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F16%3A43902522" target="_blank" >RIV/60461373:22340/16:43902522 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.sciencedirect.com/science/article/pii/S0021961416300374" target="_blank" >http://www.sciencedirect.com/science/article/pii/S0021961416300374</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jct.2016.04.009" target="_blank" >10.1016/j.jct.2016.04.009</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Phase behavior and heat capacities of the 1-benzyl-3-methylimidazolium ionic liquids

Popis výsledku v původním jazyce

The thermal behavior, solid and liquid heat capacities of the 1-benzyl-3-methylimidazolium, [Bzmim]+, based ionic liquid series with Cl-, PF6 -, BF4 -, CHF2CF2SO3 - and NTf2 - as anions were used to evaluate the effect of the insertion of an aromatic character (benzyl group) and the expected increase of the ?-? interactions as well as the impact in the cation-anion hindrance and charge delocalization in the ionic liquid properties. It was found that the molar liquid heat capacities of [Bzmim][X] are in the same order as the 1-pentyl-3-methylimidazolium, [C5C1im][X] analogs. A good correlation between the molar (solid and liquid) heat capacity and the number of atoms of the anion was found. Two different crystalline forms for [Bzmim][BF4] differing by 10 K in the melting temperature and about 10% in the heat capacity were found. The crystallization behavior, melting temperatures, and enthalpies and entropies of fusion show that the insertion of an aromatic character (benzyl group) in the imidazolium cation leads to a significant and systematic change of the thermophysical properties of the ionic liquids associated with an increase of the glass transition and melting temperatures arising from the additional ?-? interactions. ? 2016 Published by Elsevier Ltd.

Název v anglickém jazyce

Phase behavior and heat capacities of the 1-benzyl-3-methylimidazolium ionic liquids

Popis výsledku anglicky

The thermal behavior, solid and liquid heat capacities of the 1-benzyl-3-methylimidazolium, [Bzmim]+, based ionic liquid series with Cl-, PF6 -, BF4 -, CHF2CF2SO3 - and NTf2 - as anions were used to evaluate the effect of the insertion of an aromatic character (benzyl group) and the expected increase of the ?-? interactions as well as the impact in the cation-anion hindrance and charge delocalization in the ionic liquid properties. It was found that the molar liquid heat capacities of [Bzmim][X] are in the same order as the 1-pentyl-3-methylimidazolium, [C5C1im][X] analogs. A good correlation between the molar (solid and liquid) heat capacity and the number of atoms of the anion was found. Two different crystalline forms for [Bzmim][BF4] differing by 10 K in the melting temperature and about 10% in the heat capacity were found. The crystallization behavior, melting temperatures, and enthalpies and entropies of fusion show that the insertion of an aromatic character (benzyl group) in the imidazolium cation leads to a significant and systematic change of the thermophysical properties of the ionic liquids associated with an increase of the glass transition and melting temperatures arising from the additional ?-? interactions. ? 2016 Published by Elsevier Ltd.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BJ - Termodynamika

OECD FORD obor

—

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Journal of Chemical Thermodynamics

ISSN

0021-9614

e-ISSN

—

Svazek periodika

100

Číslo periodika v rámci svazku

September 2016

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

124-130

Kód UT WoS článku

000376187200014

EID výsledku v databázi Scopus

2-s2.0-84964506910