NMR Evidence for Protonated Tetraethyl p-tert-Butylcalix[4]arene Tetraacetate

• Autorzy: Kriz J. , Dybal J. , Makrlik E. , Vanura P.
• Języki publikacji: EN

Abstrakty

EN

In addition to well-known complexes of tetraethyl p-tert-butylcalix[4]arene tetraacetate (abbrev. 1) with alkali metal cations, an equimolar complex of this compound with H3O+, i.e. 1źH3O+, was found to be formed slowly in acetonitrile, however, with a very high equilibrium constant, the value ofwhich is beyond the possibilities of exact determination by NMR. Hydrogen bis(1,2-dicarbollyl) cobaltate (HDCC) was used as a proton source. Further, by a combination of 1D and 2D 1H NMR with 13C NMR spectra, it was proved that the ester carbonyls of 1 are not strongly involved in coordination of H3O+. It means that the most probable structure of the 1źH3O+ complex is obviously that with H3O+ bound by strong hydrogen bonds to the phenoxy oxygen atoms of 1.

Słowa kluczowe

EN

calix[4]arene; protonation; NMR; acetonitrile

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2007
• Tom: Vol. 81, nr 7
• Strony: 1321--1326
• Opis fizyczny: Bibliogr. 13 poz., rys.

Twórcy

autor

Kriz J.

autor

Dybal J.

autor

Makrlik E.

autor

Vanura P.

• Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovského sq. 2, 162 06 Prague, Czech Republic

Bibliografia

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