The isotopomers of PCl3 and PBr3 are well resolved in their 31P n.m.r. spectra at very high field (9.4 T) and low temperature (ca. 200 K). The isotope shifts of 0.019 (35Cl/37Cl) and 0.006 p.p.m. (79Br/81Br) fall within the predicted ranges.
M. J. Buckingham, G. E. Hawkes, I. M. Ismail and P. J. Sadler, J. Chem. Soc., Dalton Trans., 1982, 1167 DOI: 10.1039/DT9820001167
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