35Cl and 37Cl nuclear magnetic resonance of chloroorganic compounds

It has been shown that 35Cl and 37Cl chemical shifts and linewidths can be obtained using lineshape analysis. For a series of chloroorganic compounds the positions of the lines in the 35Cl and 37Cl NMR spectra were determined to an accuracy of 5–10 ppm, while the accuracy of the linewidths was 10–100 Hz. It has been also found that the ratio of 35Cl and 37Cl linewidths is not constant as expected from the assumption that the spin–spin relaxation of 35Cl and 37Cl is completely determined by the quadrupole mechanism. From 35Cl NMR data the D/H induced isotope shift for hydrochloric acid varies from 3.4 to 5.5 ppm, depending on its concentration in water. 13C–35Cl, 13C–37Cl, 19F–35Cl, 19F–37Cl coupling constants are reported.