In order to test the proposal that phosphorus-containing metal salts exist as ion pairs, in contrast to ammonium salts which exist as free-ions, an investigation of their solution structure by means of 31P and 1H NMR spectroscopy was carried out. The presence of an ionic bond in the molecule of both salts causes a decrease of both the phosphorus chemical shift and the P-H coupling constant. The change of 31P chemical shift and the P-H coupling constant depends on the type of the cation.
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Troev et al. (1988) studied this question.
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