Following quenching, signals with maxima at λ = 375 (negative) and λ = 600 nm (positive) are observed to persist well beyond the period of excited state decay and the time window of the experiment (Fig. ). To gain insight into the identity of the species produced from the quenching reaction, oxidative spectroelectrochemistry was performed on Ir(ppy)3. The difference spectrum acquired by subtracting spectra before/after electrolysis corresponds to presence of [Ir(IV)(ppy)3] + and matches that reported in the literature (Fig. ). Importantly, the signals in the spectroelectrochemistry difference spectrum match those in the ns-TA spectrum well, suggesting Ir(IV) is produced in the quenching reaction. The detection of Ir(IV) strongly suggests the production of Ni(I).