The broad 31P n.m.r. signal of the dianion of inorganic thiophosphate is shown to be caused by slow proton transfer which is subject to general base catalysis; the trianion shows a narrow 31P n.m.r. signal allowing the 18O isotope shift to be measured and from which it is concluded that sulphur bears a single negative charge, the other two charges being shared by the three oxygen atoms.
J. R. P. Arnold and G. Lowe, J. Chem. Soc., Chem. Commun., 1986, 1487 DOI: 10.1039/C39860001487
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