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Complexation of fluoride anion and its ion pairs with alkali-metal cations by tetra-substituted lower-rim calix[4]arene tryptophan derivative


Bregović, Nikola; Cindro, Nikola; Frkanec, Leo; Tomišić, Vladislav
Complexation of fluoride anion and its ion pairs with alkali-metal cations by tetra-substituted lower-rim calix[4]arene tryptophan derivative // Supramolecular chemistry, 28 (2016), 5/6; 608-615 doi:10.1080/10610278.2016.1154147 (međunarodna recenzija, članak, znanstveni)


Naslov
Complexation of fluoride anion and its ion pairs with alkali-metal cations by tetra-substituted lower-rim calix[4]arene tryptophan derivative

Autori
Bregović, Nikola ; Cindro, Nikola ; Frkanec, Leo ; Tomišić, Vladislav

Izvornik
Supramolecular chemistry (1061-0278) 28 (2016), 5/6; 608-615

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Calixarenes ; fluoride binding ; ion-pair complexation ; stability constants

Sažetak
Selective binding of fluoride anion and its alkali-metal-cation ion pairs by a fluorescent calix[4]arene (L) derivative bearing tryptophan moieties was studied in acetonitrile at 25 °C. It was found that LF and LF22− complexes were formed and their stability constants were determined by means of UV and 1H NMR titrations. Both amide and indole NH groups were involved in the stabilization of the fluoride complexes, i.e. L afforded two anion-binding sites. 1H NMR titrations provided evidence of simultaneous complexation of both Na+ cation and fluoride anion resulting in the formation of a ternary NaLF complex. In this ion-pair complex, the Na+ cation was most probably bound primarily by the calixarene ether and amide oxygen atoms, whereas the indole NH groups interacted with the fluoride ion. A highly favourable ion pairing between Na+ and F– in acetonitrile was studied using potentiometric measurements. The results pointed out the importance of fluoride pairing with alkali-metal cations in aprotic organic solvents and the necessity of taking these reactions into account in the course of speciation studies of such solutions

Izvorni jezik
Engleski

Znanstvena područja
Kemija



POVEZANOST RADA


Projekt / tema
IP-2014-09-7309

Ustanove
Institut "Ruđer Bošković", Zagreb,
Prirodoslovno-matematički fakultet, Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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