Naslov
Hydrogen Bonding and Solvent Effects on Complexation of Alkali Metal Cations by Lower Rim Calix[4]arene Tetra(O-[N-acetyl-D-phenylglycine methyl ester]) Derivative

Autori
Tomišić, Vladislav ; Galić, Nives ; Bertoša, Branimir ; Frkanec, Leo ; Simeon, Vladimir ; Žinić, Mladen

Izvornik
Journal of inclusion phenomena and macrocyclic chemistry (1388-3127) 53 (2005), 3; 263-268

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

Ključne riječi
alkali cations ; calixarenes ; complexation ; hydrogen bonds ; solvent effects ; stability constants

Sažetak
Complexation of alkali metal cations with 5, 11, 17, 23-tetra-tert-butyl-26, 28, 25, 27-tetrakis(O-methyl-D-alpha-phenylglycylcarbonylmethoxy)calix[4]arene (L) was studied by means of spectrophotometric, conductometric and potentiometric titrations at 25 °C. The solvent effect on the binding ability of L was examined by using two solvents with different affinities for hydrogen bonding, viz. methanol and acetonitrile. The complex stabilities in methanol were significantly lower. That could be explained by different solvation of the cations and by competition between the cations and methanol molecules (via hydrogen bonds) for amide carbonyl oxygens. The influence of cation solvation on complex stability was most pronounced in the case of Li+ for which, contrary to the quite stable LiL+ complex in acetonitrile, no complexation was observed in methanol under the conditions used.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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