The single, unique fluorine, F-4, will couple with the two equivalent fluorine nuclei (F3 and F5) to In this molecule there are two different chemical environmentsįor the fluorine nuclei, that is the fluorine atoms in the 3 and 5 positions (blue in the diagram)Īre in one similar environment, while the C-4 fluorine (para to the bromine) is in its own uniqueĬonsider either F-3 or F-5, this nucleus will couple with the adjacent F-4 nucleus, to give a doublet,Īnd also with the neighbouring proton, which splits this signal again to generate a doublet of doublets. The spectrum below was obtained for a sample of the partially fluorinated aromatic compoundġ-bromo,3,4,5-trifluorobenzene. Will display a larger version.] The 19F NMR spectra of C 6F 3H 2Br. Note: In most cases clicking on a spectrum These pages are slowly evolving, they will be expanded to include new spectra,ĭata and relevant links, as we get around to it. Pascal's triangle j-coupling pattern calculator, on our Some of the relevant background/theory and calculators, such as the interactive This is an area not well covered in standard NMR textbooks, we also provide You will find examples of 19F, 31P, 77Se, 119Sn, 199Hg Has resulted in us obtaining a wide range of fluorine spectra, and of other nuclei, below In fact the second most sensitive nucleus for NMR work is. Nuclei of elements other than just 1H (proton) or 13C (carbon). Multinuclear NMR spectroscopy is the name given to the study of NMR active