Theoretical studies of 1H, 13C and 15N NMR spectra for model structures of n-methylmorpholinium and N-methylpiperidinium betaines

• Autorzy: Wieczorek D. , Dega-Szafran Z. , Szafran M. , Szymusiak H. , Zieliński R. , Głembalska R.
• Języki publikacji: EN

Abstrakty

EN

Screening constants for model structures of linear and twisted conformers of N-(omega-carboxyalkyl)-N-methylmorpholinium inner salts (MMBn) and N-(omega-carboxyalkyl)-N-methylpiperidinium inner salts (MPBn) with the alkyl spacer (n) containing 1-5 methylene groups calculated by the GIAO/B3LYP/6-31+G(d, p) are reported and analyzed. Linear correlations between the experimental 1H and 13C chemical shifts and computed absolute shielding constants have been obtained. These results suggest that in solution twisted conformers dominate. The linear correlations between the calculated 15N absolute shielding constants for MMBn and MPBn suggest that the two kinds of betaines have similar structures.

• Wydawca: Institute of Bioorganic Chemistry Scientific Publishers OWN, Polish Academy of Sciences
• Czasopismo: Computational Methods in Science and Technology
• Rocznik: 2003
• Tom: Vol. 9, nr 1-2
• Strony: 147--161
• Opis fizyczny: Bibliogr. 19 poz., rys.

Twórcy

autor

Wieczorek D.

• Faculty of Chemistry, Adam Mickiewicz University Grunwaldzka 6, 60-780 Poznan, Poland

autor

Dega-Szafran Z.

• Faculty of Chemistry, Adam Mickiewicz University Grunwaldzka 6, 60-780 Poznan, Poland

autor

Szafran M.

• Faculty of Chemistry, Adam Mickiewicz University Grunwaldzka 6, 60-780 Poznan, Poland

autor

Szymusiak H.

• Faculty of Chemistry, Adam Mickiewicz University Grunwaldzka 6, 60-780 Poznan, Poland

autor

Zieliński R.

• Faculty of Chemistry, Adam Mickiewicz University Grunwaldzka 6, 60-780 Poznan, Poland

autor

Głembalska R.

• Faculty of Chemistry, Adam Mickiewicz University Grunwaldzka 6, 60-780 Poznan, Poland

• Department of Technology and Environmental Protection, Poznań University of Economics, Aleja Niepodleglości 10, 60-967 Poznań, Poland,

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