1H NMR evidence for the bi-pyridinium nature of the pyridine salt of H3PW12O40

N. Essayem (1) , C. Lorentz (1) , A. Tuel (1) , Y. Ben Taarit (1)

1 IRC - Institut de recherches sur la catalyse

Pyridinium salts of H3PW12O40 and H3PMo12O40 were investigated by 1H NMR and IR spectroscopies. 1H NMR evidenced the formation of bi-pyridinium cation in the pyridinium salt of H3PW12O40, while a classical pyridinium cation was identified in the pyridinium salt of H3PMo12O40. 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.

Domaines: Catalyse

N. Essayem, C. Lorentz, A. Tuel, Y. Ben Taarit. 1H NMR evidence for the bi-pyridinium nature of the pyridine salt of H3PW12O40. Catalysis Communications, 2005, 6 (8), pp.539-541. ⟨hal-00012763⟩