期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 107, 期 15, 页码 2624-2628出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp021611b
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We present picosecond time-resolved resonance Raman spectroscopy experiments investigating the photoproducts produced after ultraviolet photolysis of CH2I2 in CH3OH solution and in 50% CH3OH/50% H2O and 50% CH3CN/50% H2O by volume mixed solvents. We observe that isodiiodomethane (CH2I-I) is formed within several picoseconds and has a lifetime that significantly depends on the solvent system (time constant of 3.8 ns in CH3OH, 1.8 ns in 50% CH3CN/50% H2O, and 0.8 ns in 50% CH3OH/50% H2O). Our results indicate that CH2I-I can be formed via geminate recombination in aqueous environments but will have a shorter lifetime than in previous experiments done in several organic solvents. The variations in the lifetime of CH2I-I in the presence of H2O and CH3OH could be due to its chemical reaction with the O-H bond and/or possibly faster cleavage of the weak I-I bond in aqueous solutions. We briefly discuss the potential role of CH2I-I in the release of reactive halogens in aqueous environments.
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