183W NMR Study of Peroxotungstates Involved in the Disproportionation of Hydrogen Peroxide into Singlet Oxygen ((1)O(2), (1)Delta(g)) Catalyzed by Sodium Tungstate in Neutral and Alkaline Water.
The disproportionation of aqueous hydrogen peroxide catalyzed by sodium tungstate has been investigated with regard to the multiplicity of the oxygen molecules released. Trapping experiments and detection of the IR luminescence of (1)O(2) have shown that the yield of (1)O(2) is virtually quantitative. The mono-, di-, and tetraperoxotungstate intermediates W(O(2))(n)()O(4)(-)(n)()(2)(-) (n = 1, 2, 4) have been characterized by UV and (183)W NMR spectroscopies. The diperoxo species is proposed as the precursor of (1)O(2).
Nardello
V.
V
Equipe de Recherches "Oxydation et Formulation", URA CNRS 351, Cité Scientifique, ENSCL, BP 108, F-59652 Villeneuve d'Ascq Cedex, France, and Laboratoire d'Application RMN, Laboratoire de Physique, URA CNRS 351 Faculté de Pharmacie, BP 83, F-59006 Lille Cedex, France.
Marko
J.
J
Vermeersch
G.
G
Aubry
J. M.
JM