Issue 7, 2018

Laser-induced reprecipitation of pyrene at 77 K and its dynamics as studied by spectroscopic techniques

Abstract

Reprecipitation of pyrene (Py) in the glassy solution of methylcyclohexane and isopentane at 77 K was observed by the repetitive irradiation of nanosecond (ns) laser pulses at 355 nm. The dynamics and mechanism of this reprecipitation were investigated by means of time-resolved fluorescence and absorption spectroscopies. Although only the fluorescence of the Py monomer was observed before the ns laser irradiation, fluorescence of the excimer was observed during the initial one-shot laser irradiation. From the time-resolved fluorescence measurements, it was revealed that the appearance of the excimer was due to the transient melting of the glassy medium by the local temperature increase around Py, which was induced by the iterative reabsorption of the laser light by the S1 state. The time period of melting for allowing the translational diffusion of Py was limited in the time region ≤ ca. 10 ns. With an increase in laser exposure, the fluorescence intensity of the excimer increased concomitantly with the appearance and increase of the amount of Py dimer, which was also confirmed by steady-state absorption spectroscopy. Time-resolved fluorescence spectrum recorded by only the one-shot laser exposure did not show dimer emission. This suggested that the formation of the dimer was through the excimer produced by transient melting; its dissociation into monomers was prohibited in the highly viscous environment. Upon further increase in laser exposure (several 1000 shots), solidified Py was observed due to crystal formation/aggregation with the dimers as the nucleation species.

Graphical abstract: Laser-induced reprecipitation of pyrene at 77 K and its dynamics as studied by spectroscopic techniques

Supplementary files

Article information

Article type
Paper
Submitted
30 jan 2018
Accepted
19 mai 2018
First published
21 mai 2018

Photochem. Photobiol. Sci., 2018,17, 910-916

Laser-induced reprecipitation of pyrene at 77 K and its dynamics as studied by spectroscopic techniques

F. Ito, S. Miyadera, H. Matsuda, Y. Ishibashi, S. Ito and H. Miyasaka, Photochem. Photobiol. Sci., 2018, 17, 910 DOI: 10.1039/C8PP00047F

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