Reactions of radicals with hydrolyzed Bi(III) ions : a pulse radiolysis study

Roland Benoit (1) , Marie-Louise Saboungi (1) , Mona Tréguer-Delapierre (2) , B. H. Milosavljevic (3) , D. Meisel (3)

1 CRMD - Centre de Recherche sur la Matière Divisée
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
3 The Radiation Laboratory and Department of Chemistry and Biochemistry

Radiolytic reduction of BiOClO4 in aqueous solutions leads to the formation of bismuth clusters and larger nanoparticles. The mechanisms of redox reactions of the polycationic Bi(III) species that exist in the solution were investigated with pulse radiolysis. The kinetic and spectral properties of the transients formed by the reaction of these species with the primary radicals from water radiolysis are reported. The single-electron reduction product, Bi9(OH)224+, absorbs at lambdamax = 273 nm, while the OH adduct, Bi9(OH)235+, has a broad absorption spectrum with a maximum at 280 nm and a shoulder at 420 nm. Several rate constants were measured: k (e-aq + Bi9(OH)225+) = 1.2 x 1010 M-1 s-1 and k (OH + Bi9(OH)225+) = 1.5 x 109 M-1 s-1...

Mots clés: Bismuth; Radiolysis; Transient intermediate; Nanoparticles

Domaines: Matériaux

Roland Benoit, Marie-Louise Saboungi, Mona Tréguer-Delapierre, B. H. Milosavljevic, D. Meisel. Reactions of radicals with hydrolyzed Bi(III) ions : a pulse radiolysis study. Journal of Physical Chemistry A, 2007, 111 (42), pp.10640-10645. ⟨10.1021/jp073895b⟩. ⟨hal-00186854⟩