Abstract
Abstract— The influence of chloride ion on the rate of decay of triplet methylene blue in 0.01 M acid in the absence and presence of ferrous ions was investigated by means of laser flash‐photolysis monitored by kinetic spectrophotometry. Chloride weakly accelerates decay of 3MBH2± in aqueous solution in the absence of Fe(II). Quenching of 3MBH2+ by Fe(II) is more strongly catalyzed by Cl‐ in both water and 50 v/v% aq. CH3CN. The uncatalyzed quenching constant, k5, is of the order of 1 × 106M‐1 s‐1 while in 4.8 M aqueous chloride (μ– 7.2 M) k5= (37.2 ± 1.8) × 106M‐1 s‐1. A possible role of chloride is as a bridging species in quenching via electron transfer between 3MBH2+ and Fe(II).
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