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- W2155398293 abstract "Abstract The quenching mechanism by hexamethylbenzene (HMB) of singlet oxygen ( 1 O 2 ( 1 Δ g )) was investigated as a function of pressure up to 400 MPa by measurements of the phosphorescence decay. The quenching rate constant, k obs , increases significantly with increasing pressure in the solvents examined, and the activation volume for k obs , Δ V ≠ obs falls in the range from −29.7 to −25.8 cm 3 /mol, depending on the solvent. It was found that Δ V ≠ obs is almost independent of the solvent polarity parameter, q P (=∂[{( e − 1)/(2 e + 1)}/∂P] T ), where e is the dielectric constant of the solvent. However, k obs is correlated linearly to q (=( e − 1)/(2 e + 1)) at a given pressure, up to 400 MPa. These observations were interpreted by assuming that quenching occurs through a nonpolar encounter complex between 1 O 2 and HMB, and the singlet, 1 E , and triplet, 3 E , exciplexes. The volumetric analysis on the basis of this scheme revealed that the activation volume for the observed rate constant, k ISC , of the intersystem crossing from 1 E to 3 E decreases with increasing solvent polarity. The solvent–polarity dependence of k ISC is discussed." @default.
- W2155398293 created "2016-06-24" @default.
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- W2155398293 date "1999-06-01" @default.
- W2155398293 modified "2023-10-01" @default.
- W2155398293 title "Effect of high pressure on the quenching by hexamethylbenzene of singlet oxygen in liquid solution" @default.
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- W2155398293 doi "https://doi.org/10.1016/s1010-6030(99)00076-3" @default.
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