Second triplet level of 1,5-dichloroanthracene in fluid solutions

A two-laser, two-color time-resolved EPR (TREPR) technique has been applied to the investigation of the electron spin polarization in the excited triplet states of anthracene and its halogen anthracene in rigid glassy matrixes. The one-laser excitation of anthracenes with 355 nm gave the triplet TREPR spectra of the lowest excited triplet (T1) states with EEE/AAA polarization pattern. For 9-bromoanthracene and 9,10-dibromoanthracene, the reexcitation by a dye laser (442 nm) to the upper excited triplet (T n : n > 3) states brought about the opposite phase polarization in the T1 states. The phenomena were interpreted in terms of the sublevel selective reverse intersystem crossing (RISC) from the T n (n = 2 or 3) state to the S1 state. The time profiles of the polarization were analyzed taking into account the anisotropic RISC processes. On the other hand, for anthracene and 9,10-dichloroanthracene, little effect was observed on the electron spin polarization by two-step laser irradiation.

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Deuterium, methyl, and solvent effects on the phosphorescence lifetime of benzene

Haaland

Nieman

1973

The Journal of Chemical Physics

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The phosphorescence lifetimes of benzene and a number of its methyl and deutero derivatives have been investigated in a wide variety of solvents at temperatures below 65 °K. Deuterium effects indicate a dominant role for the aryl hydrogens in the radiationless process. Methylation increases the triplet decay rate by approximately 25% per methyl group in a nearly linear fashion. Intensity data indicate that this is not due to ``allowed'' character introduced by any reduction in molecular symmetry as is theoretically predicted to be the case. Perfluorocarbons act as inert solvents for benzene derivatives whereas typical hydrocarbons produce 50% or greater changes in the lifetimes even at very low temperatures. The data suggest a common mechanistic pathway (or perturbed state) for both the effects of solvent and methyl groups

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Second triplet level of 1,5-dichloroanthracene in fluid solutions

Cited by 4 publications

References 1 publication

ChemInform Abstract: ZWEITES TRIPLETT‐NIVEAU VON 1,5‐DICHLOR‐ANTHRACEN IN FLUESSIGEN LOESUNGEN

ChemInform Abstract: ZWEITES TRIPLETT‐NIVEAU VON 1,5‐DICHLOR‐ANTHRACEN IN FLUESSIGEN LOESUNGEN

Anisotropic Intersystem Crossing from the Upper Excited Triplet States of Anthracenes: Two-laser Time-Resolved EPR Study

Deuterium, methyl, and solvent effects on the phosphorescence lifetime of benzene

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