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Pregled bibliografske jedinice broj: 257452

Zbornik radova

Autori: Tomišić, Vladislav; Požar, Josip; Preočanin, Tajana; Frkanec, Leo
Naslov: Thermodynamics of complexation of alkali metal cations by lower rim calix[4]arene amino acid derivative
( Thermodynamics of complexation of alkali metal cations by lower rim calix[4]arene amino acid derivative )
Izvornik: 1st European Chemistry Congress, Abstract BookBudimpešta :
Skup: 1st European Chemistry Congress
Mjesto i datum: Budimpešta, Mađarska, 27.-31. 08. 2006.
Ključne riječi: calixarenes; complexation; microcalorimetry
( calixarenes; complexation; microcalorimetry )
Sažetak:
Complexation of alkali metal cations with 5, 11, 17, 23-tetra-tert-butyl-26, 28, 25, 27-tetrakis(O-methyl-D- -phenylglycylcarbonylmethoxy)calix 4 arene [1] in methanol and acetonitrile was studied by means of direct and competitive microcalorimetric titrations. The stability constants of the corresponding 1:1 complexes were determined, the values obtained being in good agreement with those measured previously by UV spectrophotometry [2]. Calorimetric titrations also provided information about the enthalpies and entropies of complexation reactions. All the reactions investigated were enthalpy driven. In addition, solubilities (and consequently solution Gibbs energies) of the ligand and its complexes in both solvents were determined, as were the corresponding solution enthalpies and entropies. The thermodynamic data were discussed regarding the structural properties of the ligand and cations, as well as the solvation abilities of the solvents examined.
Vrsta sudjelovanja: Poster
Vrsta prezentacije u zborniku: Sažetak
Vrsta recenzije: Nema recenziju
Projekt / tema: 0098053, 0119620
Izvorni jezik: eng
Kategorija: Znanstveni
Znanstvena područja:
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