Electrogenerated chemiluminescence of Pb(II)-bromide complexes

The electrochemistry and electrogenerated chemiluminescence (ECL) of Pb4Br11 3− in acetonitrile solution is reported. Pb4Br11 3− is formed in situ by the reaction of lead(II) and bromide ions with ECL generated upon sweep to positive potentials using tri-n-propylamine (TPrA) as an oxidative–reductive coreactant. An ECL efficiency (φecl) of 0.0079 was obtained compared to Ir(ppy)3 (ppy=2-phenylpyridine; φecl=1). The ECL intensity peaks at a potential corresponding to oxidation of TPrA and Pb4Br11 3− indicating that emission is from the lead-bromide cluster.