V
Vahur Mäemets
Researcher at University of Tartu
Publications - 17
Citations - 1569
Vahur Mäemets is an academic researcher from University of Tartu. The author has contributed to research in topics: Steric effects & Substituent. The author has an hindex of 12, co-authored 17 publications receiving 1440 citations. Previous affiliations of Vahur Mäemets include University of Bremen & National Academy of Sciences of Ukraine.
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Journal ArticleDOI
Extension of the self-consistent spectrophotometric basicity scale in acetonitrile to a full span of 28 pKa units: unification of different basicity scales.
Ivari Kaljurand,Agnes Kütt,Lilli Sooväli,Toomas Rodima,Vahur Mäemets,and Ivo Leito,Ilmar A. Koppel +6 more
TL;DR: The earlier compiled self-consistent spectrophotometric basicity scale in acetonitrile (AN) was expanded to range from 3.8 to 32.0 pK(a) units, that is 28 orders of magnitude, and 54 new relative basicity measurements were carried out and 37 new compounds were introduced to the scale.
Journal ArticleDOI
Equilibrium acidities of superacids.
Agnes Kütt,Toomas Rodima,Jaan Saame,Elin Raamat,Vahur Mäemets,Ivari Kaljurand,Ilmar A. Koppel,Romute Yu. Garlyauskayte,Yurii L. Yagupolskii,Lev M. Yagupolskii,Eduard Bernhardt,Helge Willner,Ivo Leito +12 more
TL;DR: The current scale is complementary to the well-known H(0) scale in the information that it provides and is expected to be a useful tool in design, use, and further acidity measurements of superacidic molecules.
Journal ArticleDOI
Acid−Base Equilibria in Nonpolar Media. 2.1 Self-Consistent Basicity Scale in THF Solution Ranging from 2-Methoxypyridine to EtP1(pyrr) Phosphazene
TL;DR: The predictability of the basicity together with suitable spectral properties in the UV range make the phenylphosphazenes convenient neutral indicators in the high basicity range where the choice of neutral indicators is very limited.
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Guanidinophosphazenes: design, synthesis, and basicity in THF and in the gas phase.
Alexander A. Kolomeitsev,Ilmar A. Koppel,Toomas Rodima,Jan Alexander Barten,Enno Lork,Gerd-Volker Röschenthaler,Ivari Kaljurand,Agnes Kütt,I. Koppel,Vahur Mäemets,Ivo Leito +10 more
TL;DR: Seven new nonionic superbasic phosphazene bases, tetramethylguanidino-substituted at the P atom, have been synthesized and are predicted to exceed the basicity of (dma)3P=NH by more than 40 powers of 10 and to surpass also thebasicity of the widely used commercial [(dma]3P =N]3p=N-t-Bu (t- BuP4) superbase.
Journal ArticleDOI
Acid-base equilibria in nonpolar media. 4. Extension of the self-consistent basicity scale in THF medium. Gas-phase basicities of phosphazenes.
Ivari Kaljurand,Toomas Rodima,Aino Pihl,Vahur Mäemets,Ivo Leito,Ilmar A. Koppel,Masaaki Mishima +6 more
TL;DR: Eleven new phenyl-substituted phosphazenes (P1, P3-, and P4-bases) have been synthesized by the Staudinger or the Kirsanov reactions, and the UV-vis spectrophotometric titration method was used to establish the relative basicity of them and to extend the ion-pair basicity scale for THF medium.