Laser-flash Photolysis of DMSO–Cl Complexes in Dimethyl Sulfoxide/CCl4 Mixed Solvent

Nakayama

et al. 2006

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Complexes of chlorine atoms with carbon disulfide (CS 2 ) were produced by pulse radiolysis of CS 2 in halocarbons and photochemical reactions were studied by laser flash photolysis. Excitation of CS 2 /Cl complexes was resulted in rapid and permanent photobleaching. The photobleaching of CS 2 /Cl complexes is due to intermolecular chlorine atom abstraction in CCl 4 with a quantum yield of 0.04, while it is ascribed to hydrogen atom abstraction in 1,2-dichloroethane with a quantum yield of 0.21. The effects of additives were discussed based on the bond dissociation energy.

Section: Introductionsupporting

confidence: 66%

Photochemistry of CS2/Cl complexes—combined pulse radiolysis–laser flash photolysis studies

Nakayama

et al. 2006

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“…Recently, preliminary photochemical studies of DMSO _ Cl complexes were carried out in DMSO/CCl 4 mixed solvents using a combined pulse radiolysis-laser flash photolysis technique, which found relatively high quantum yields (> 0.24) of photobleaching, may be due to intramolecular hydrogen abstraction and the significant solvent dependence of the quantum yields (Sumiyoshi et al, 2005c). In this work, photochemistry of DMSO _ Cl complexes was investigated in DMSO/1,2-dichloroethane mixed solvents and different effects of the DMSO concentration on the photobleaching quantum yields from those observed in the DMSO/CCl 4 mixed solvents were found.…”

Section: Introductionmentioning

confidence: 99%

Solvent effects on the photochemistry of dimethyl sulfoxide–Cl complexes studied by combined pulse radiolysis and laser flash photolysis

Minegishi

et al. 2006

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Photolysis of complexes of dimethyl sulfoxide (DMSO) with chlorine atoms results in rapid and permanent photobleaching which may be due to intramolecular hydrogen abstraction. The effects of solvent polarity were examined in a wide variety of DMSO-carbon tetrachloride mixed solvents. The quantum yields of photobleaching decreased from 0.27 to 0.08 as the solvent polarity increased, while significant changes were observed in the low DMSO concentration range (< 0.2 mol dm -3 ). This cannot be accounted for by simple solvent polarity effects. The effects of polar and nonpolar additives were also examined and it is concluded that the specific solvation effect of DMSO was the main cause of the significant change in the quantum yields in the low concentration range of DMSO.

“…The extinction coefficient of the DMSO _ Cl complexes was determined as (7800±50) M -1 cm -1 at λ max =400 nm in the previous study (Sumiyoshi et al, 2005a(Sumiyoshi et al, , 2006.…”

Section: Formation Of Dmso-br Complexesmentioning

confidence: 99%

Pulse radiolysis studies of the reactions of bromine atoms and dimethyl sulfoxide–bromine atom complexes with alcohols

Katagiri

et al. 2007

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