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1
NMR Evidence for Protonated Tetraethyl p-tert-Butylcalix[4]arene Tetraacetate
Kriz J., Dybal J., Makrlik E., Vanura P.
Polish Journal of Chemistry
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2007
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Vol. 81, nr 7
1321-1326
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.
2
Stability of Valinomycin-Proton Complex in Nitrobenzene Saturated with Water
Makrlik E., Vanura P.
Polish Journal of Chemistry
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2005
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Vol. 79 / nr 9
1531-1534
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