Naslov
Thermodynamics of Several Ion-Pairings in Acetonitrile

Autori
Cvetnić, Marija ; Mendeš, Davor ; Bregović, Nikola ; Tomišić, Vladislav

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Solutions in Chemistry 2022 : Book of Abstracts / Meštrović, Ernest ; Namjesnik, Danijel ; Ribić, Rosana ; Šekutor, Marina ; Tomišić ; Vladislav Tomišić, Usenik, Andrea - Zagreb : Hrvatsko kemijsko društvo, 2022, 87-87

ISBN
978-953-8334-05-4

Skup
Solutions in Chemistry 2022

Mjesto i datum
Sveti Martin na Muri, Hrvatska, 08.11.2022. - 11.11.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
ion-pairing ; acetonitrile ; thermodynamics ; conductometry ; ITC

Sažetak
In the field of supramolecular chemistry, ditopic receptors capable of binding ion-pairs play a significant role. The binding of cation on a ditopic receptor often allosterically affects the binding of an anion (or vice versa) enhancing the stability of the resulting complexes. In order to fully understand and exploit such cooperativity it is necessary to characterize the underlying structural and thermodynamic aspects. Recently we synthesized amide-ureido-calix[4]arene derivative and investigated its ability as ion- pair receptor in acetonitrile. During this investigation a need for the values of equilibrium constants for ion-pairing in this solvent emerged. Namely, organic solvents are generally better media for the complexation of ions with organic receptors because ions are poorly solvated in them in comparison to water. However, the latter fact also results with the increase of significance of ion-pairing in organic solvents. As the literature lacks the constants of ion-pairings in acetonitrile, we investigated the thermodynamics of ion-pairing for several lithium and sodium salts using conductometric and microcalorimetric titrations. The obtained results were correlated with the basicities of the examined anions in acetonitrile, and compared with standard Gibbs energies of transfer of the appropriate ions from water to acetonitrile.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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