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Fujiwara M, Mouri Y, Ariki K, et al. Photodissociation of p-xylene in polar and nonpolar solutions. J Phys Chem A. 2005;109(1):36-9doi: 10.1021/jp040522r.
Fujiwara, M., Mouri, Y., Ariki, K., & Tanimoto, Y. (2005). Photodissociation of p-xylene in polar and nonpolar solutions. The journal of physical chemistry. A, 109(1), 36-9. https://doi.org/10.1021/jp040522r
Fujiwara, M, et al. "Photodissociation of p-xylene in polar and nonpolar solutions." The journal of physical chemistry. A vol. 109,1 (2005): 36-9. doi: https://doi.org/10.1021/jp040522r
Fujiwara M, Mouri Y, Ariki K, Tanimoto Y. Photodissociation of p-xylene in polar and nonpolar solutions. J Phys Chem A. 2005 Jan 13;109(1):36-9. doi: 10.1021/jp040522r. PMID: 16839086.
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J Phys Chem A. 2005 Jan 13;109(1):36-9. doi: 10.1021/jp040522r.

Photodissociation of p-xylene in polar and nonpolar solutions.

The journal of physical chemistry. A

M Fujiwara, Y Mouri, K Ariki, Y Tanimoto

Affiliations

  1. Graduate School of Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan. [email protected]

PMID: 16839086 DOI: 10.1021/jp040522r

Abstract

The photodissociation of p-xylene at 266 nm in n-heptane and acetonitrile has been studied with use of nanosecond fluorescence and absorption spectroscopy. The p-methylbenzyl radical was identified in n-heptane and acetonitrile by its fluorescence, which was induced by excitation at 308 nm. The p-xylene radical cation was observed in acetonitrile by its absorption. In n-heptane, the decay rate of the S(1) state of p-xylene ((3.2 +/- 0.2) x 10(7) s(-1)) is equal to the growth rate of the p-methylbenzyl radical ((2.7 +/- 0.4) x 10(7) s(-1)), showing that the molecule dissociates via the S(1) state into the radical by C-H bond homolysis (quantum efficiency approximately 5.0 x 10(-3)). In acetonitrile, the formation of the p-xylene radical cation requires two 266 nm photons, and the decay rate of the radical cation ((1.6 +/- 0.2) x 10(6) s(-1)) equals the growth rate of the p-methylbenzyl radical ((2.0 +/- 0.2) x 10(6) s(-1)). This shows that the radical cation dissociates into the radical by deprotonation (quantum efficiency approximately 8.9 x 10(-2)).

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