Thermal and Volumetric Properties of Five Lactones at Infinite Dilution in Water

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F19%3A43917992" target="_blank" >RIV/60461373:22340/19:43917992 - isvavai.cz</a>

Výsledek na webu

<a href="https://pubs.acs.org/doi/10.1021/acs.jced.8b01146" target="_blank" >https://pubs.acs.org/doi/10.1021/acs.jced.8b01146</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jced.8b01146" target="_blank" >10.1021/acs.jced.8b01146</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermal and Volumetric Properties of Five Lactones at Infinite Dilution in Water

Popis výsledku v původním jazyce

Mixing enthalpies and densities of highly dilute aqueous solutions of five lactones (namely γ-butyrolactone (GBL), γ-valerolactone (GVL), α-angelica lactone (AAL), γ-hexalactone (GHL), and δ-hexalactone (DHL)) were measured as a function of solution composition at several temperatures in the range from (288.15 to 318.15) K using a tandem flow arrangement of isothermal mixing microcalorimeter and vibrating-tube densimeter. The densities of the neat lactones were measured, also. The dissolution of the lactones in water was found to be exothermic (except for AAL at higher temperatures) and accompanied by volume contraction. On the basis of these systematic measurements, reliable values of partial molar excess enthalpy, partial molar volume, and partial molar excess volume of the studied solutes at infinite dilution in water were determined. Precision of our measurements allowed us to evaluate with a good accuracy also respective temperature derivative properties, that is, infinite dilution partial molar excess heat capacity, expansion, and excess expansion. The observed thermodynamic behavior was shown to be governed by hydrogen bonding of water molecules to the oxygen atoms of the lactone group. Several structural effects like those of the alkylation of lactone ring, its enlargement, the introduction of the double bond, and the lactone molecular volume on the determined properties were identified and rationalized on the molecular level. © 2019 American Chemical Society.

Název v anglickém jazyce

Thermal and Volumetric Properties of Five Lactones at Infinite Dilution in Water

Popis výsledku anglicky

Mixing enthalpies and densities of highly dilute aqueous solutions of five lactones (namely γ-butyrolactone (GBL), γ-valerolactone (GVL), α-angelica lactone (AAL), γ-hexalactone (GHL), and δ-hexalactone (DHL)) were measured as a function of solution composition at several temperatures in the range from (288.15 to 318.15) K using a tandem flow arrangement of isothermal mixing microcalorimeter and vibrating-tube densimeter. The densities of the neat lactones were measured, also. The dissolution of the lactones in water was found to be exothermic (except for AAL at higher temperatures) and accompanied by volume contraction. On the basis of these systematic measurements, reliable values of partial molar excess enthalpy, partial molar volume, and partial molar excess volume of the studied solutes at infinite dilution in water were determined. Precision of our measurements allowed us to evaluate with a good accuracy also respective temperature derivative properties, that is, infinite dilution partial molar excess heat capacity, expansion, and excess expansion. The observed thermodynamic behavior was shown to be governed by hydrogen bonding of water molecules to the oxygen atoms of the lactone group. Several structural effects like those of the alkylation of lactone ring, its enlargement, the introduction of the double bond, and the lactone molecular volume on the determined properties were identified and rationalized on the molecular level. © 2019 American Chemical Society.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Journal of Chemical Engineering Data

ISSN

0021-9568

e-ISSN

—

Svazek periodika

64

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

1577-1585

Kód UT WoS článku

000464768500027

EID výsledku v databázi Scopus

2-s2.0-85063492719