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Thermodynamics of complexation of alkali metal cations by lower rim calix[4]arene amino acid derivative (CROSBI ID 519287)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa

Tomišić, Vladislav ; Požar, Josip ; Preočanin, Tajana ; Frkanec, Leo Thermodynamics of complexation of alkali metal cations by lower rim calix[4]arene amino acid derivative // 1st European Chemistry Congress : Abstract Book. Budimpešta, 2006. str. 373-373

Podaci o odgovornosti

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

engleski

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

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.

calixarenes ; complexation ; microcalorimetry

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Podaci o prilogu

373-373.

2006.

objavljeno

Podaci o matičnoj publikaciji

1st European Chemistry Congress : Abstract Book

Budimpešta:

Podaci o skupu

1st European Chemistry Congress

poster

27.08.2006-31.08.2006

Budimpešta, Mađarska

Povezanost rada

Kemija