Naslov
Thermodynamics of complexation of alkali metal cations by lower rim calix[4]arene amino acid derivative

Autori
Tomišić, Vladislav ; Požar, Josip ; Preočanin, Tajana ; Frkanec, Leo

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

Izvornik
1st European Chemistry Congress : Abstract Book / - Budimpešta, 2006, 373-373

Skup
1st European Chemistry Congress

Mjesto i datum
Budimpešta, Mađarska, 27.08.2006. - 31.08.2006

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
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.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA