Interaction of sodium and potassium ions with the cis isomers of dicyclohexyl-18-crown-6 in nonaqueous media

• Autorzy: Wagner-Czauderna, E. , Filipek, S. , Kalinowski, M.K.
• Języki publikacji: EN

Abstrakty

EN

The formation constants, K-s for 1:1 complexes of the cis-syn-cis and cis-anti-cis isomers of dicyclohexyl-18-crown-6 with sodium and potassium cations have been electrochemically determined in 10 nonaqueous (protic and aprotic) media. Linear correlations were obtained for log K-s with standard Gibbs transfer energies of the cation from water to a given solvent. The cis-anti-cis isomer was found to be a weaker complexer than the cis-syn-cis one and this was elucidated in terms of the ligand solvation. Energy-minimized structures of the ligands and complexes suuuounded by methanol and acetonitrile molecules were established by molecular dynamics computations.

Słowa kluczowe

EN

dicyclohexyl-18-crown-6; sodium and potassium complexes; stability constants; solvent effect; molecular dynamics; thermodynamics

• Czasopismo: Polish Journal of Chemistry
• Rocznik: 1998
• Tom: Vol. 72, nr 10
• Strony: 2294-2302
• Opis fizyczny: Bibliogr. 53 poz., tab., wykr.

Twórcy

autor

Wagner-Czauderna, E.

autor

Filipek, S.

autor

Kalinowski, M.K.

• Department of Chemistry University of Warsaw 1 Pasteur St. 02-093 Warszawa Poland