Naslov
UREIDO-CALIX[4]ARENE DERIVATIVES IN THE ROLE OF HOSTS FOR ANIONS, ION-PAIRS, AND/OR DIACETATOCALIX[4]ARENES

Autori
Cvetnić, Marija ; Cindro, Nikola ; Bregović, Nikola ; Tomišić, Vladislav

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

Izvornik
Adriatic NMR Conference 2023 : Book of abstracts / Bregović, Nikola ; Namjesnik, Danijel ; Novak, Predrag ; Parlov Vuković, Jelena - ZAGREB : Hrvatsko kemijsko društvo, 2023, 39-39

Skup
The Adriatic NMR Conference 2023

Mjesto i datum
Mali Ston, Hrvatska, 01.06.2023. - 04.06.2023

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Anion receptor ; ion-pair receptor ; calix[4]arene ; urea ; binding thermodynamics

Sažetak
The ultimate target of the ongoing development of anion and ion-pair receptors is their application in some real-world functions such as sensing and transport in biological systems, extraction in industrial processes, and new water purification technologies.[1–3] Among classical anion and ion- pair receptors containing hydrogen-bond donating groups, [4, 5] a significant place belongs to calixarenes containing (thio)urea moieties. Despite being known for a few decades, the fundamental and the application-oriented work with the latter ion-receptors is still in progress. [6, 7] In this talk, fundamental research of binding of anions on two new simple urea-derivatives of p- tert-butylcalix[4]arenes (1, 2 ; Figure 1) in acetonitrile will be presented. Thermodynamics of complexation of the selected anions (Cl–, HSO4–, H2PO4–, hydrogen pyrophosphate, acetate, benzoate) was investigated using UV/Vis, ITC, and 1H NMR titrations. Macrocycle with four urea-moieties (2) proved to be a better anion receptor in comparison to diureido-calix[4]arene derivative (1) which is in accordance with the pKa values of these calixarenes (experimentally determined by NMR). Furthermore, the cooperative effect in binding of Na+ and several anions (Cl–, HSO4–, H2PO4–) with receptor 1 (designed also as ion-pair receptor) was evaluated. The other part of this talk will demonstrate the realization of the idea of reversible formation of supramolecular dimeric calix[4]arene capsules (1 or 2 & 3 or 4) based on urea – carboxylate interactions which can be governed by changing the solution acidity.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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