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Abstrakty
1 H,13 C and 14 N NMR chemical shifts have been used to monitor the dilution process of JV,7V-dimethylformamide (DMF) in monosubstituted benzenes. Both the proton and carbon chemical shifts of non-equivalent methyl groups in DMF are spectacularly influenced by ASIS (Aromatic Solvent Induced Shift) effects at the low concentration of a solute. On the other hand, the destruction of DMF liquid structure itself is better seen when the 13C chemical shift of a carbonyl carbon and the 14N shift are verified. A good correlation between the latter NMR chemical shifts has been found. It is shown on the basis of GIAO-CHF model calculations that the destruction of solute dipole-dipole dimers may be responsible for the increase of carbonyl carbon and nitrogen shielding constants of DMF in solvents.
Rocznik
Tom
Strony
81--89
Opis fizyczny
Bibliogr. 21 poz.
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autor
autor
autor
- Department of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warszawa, Poland (Wydział Chemii, Uniwersytet Warszawski)
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Bibliografia
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bwmeta1.element.baztech-article-BPP1-0014-0072