Ressonância magnética nuclear de substâncias organofluoradas: um desafio no ensino de espectroscopia
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Data
2015-11
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Resumo
Nuclear magnetic resonance is a technique that is widely used for elucidating and characterizing organic
substances. Organofluorine substances have applications in many areas from drugs to liquid crystals, but their NMR spectra are often
challenging due to fluoride coupling with other nuclei. For this reason, NMR spectra of this class of substances are not commonly
covered in undergraduate and graduate chemistry courses and related fields. Thus, the aim of this work was the presentation and
discussion of 1H, 13C, and 19F NMR spectra of eleven organofluorine substances which, in the case of 1H and 13C nuclei, showed
classic patterns of first-order coupling and the effects of the fluorine nucleus in different chemical and magnetic environments. In
addition, the observation of long distance coupling constants was possible through the use of apodization functions in the processing
of the spectra. It is expected that the examples presented herein can be utilized and discussed in undergraduate and graduate NMR
spectroscopy disciplines and thus improve the teaching and future research of organofluorine compounds.
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Organofluorine, 1H NMR, 13C NMR, 19F NMR
Citação
BRANCO, Frederico Silva Castelo et al. Ressonância magnética nuclear de substâncias organofluoradas: um desafio no ensino de espectroscopia. Química Nova, São Paulo, v. 38, n. 9, p. 1237-1246, nov. 2015.