The nuclear magnetic resonance spectra of four spin systems
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High resolution H1 and F19 nuclear magnetic resonance spectra of 1-fluoro, 2, 4-dinitrobenzene were obtained and analyzed to determine all the parameters involved. As the spectrum of one of the protons is well separated from that of the other two, the secular equation has been solved in the first approximation. The analysis gives the following spin-spin coupling constants: J0 HH = 8.7 ± 0.3 cps., Jm HH = 2.9 ± 0.2 cps., Jp HH = 0.6 ± 0.3 cps., J0 HH = 10.4 ± 0.2 cps., and the two meta H-F coupling constants were found to be considerably different being 6.5 ± 0.3 cps. and 3.8 ± 0.3 cps. It has been found that theortho andmeta H-F coupling constants have the same sign as theortho andpara H-H coupling constants.
KeywordsNuclear Magnetic Resonance Spectrum Spin System Diagonal Matrix Element Fluorobenzenes Combination Line
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