Abstract
Pyridinium salts of H 3PW 12O 40 and H 3PMo 12O 40 were investigated by 1H NMR and IR spectroscopies. 1H NMR evidenced the formation of bi-pyridinium cation in the pyridinium salt of H 3PW 12O 40, while a classical pyridinium cation was identified in the pyridinium salt of H 3PMo 12O 40. Pyridinium and bi-pyridinium species were clearly differentiated by infra red spectroscopy: The bi-pyridinium cation is characterized by the splitting of the 8b and 19b vibration modes of the pyridinium ring.
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