Spectral characteristics of heterocyclic compounds with a chain structure, cooled in an ultrasonic jet View Full Text


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Article Info

DATE

2006-11

AUTHORS

V. A. Povedailo, D. L. Yakovlev

ABSTRACT

We have recorded the fluorescence excitation spectra of three heterocyclic compounds with a chain structure [BPO (2-phenyl-5-(4-diphenylyl)oxazole), POPOP (1,4-di[2-(5-phenyloxazolyl)]benzene, and TOPOT (1,4-di[2-(5-n-tolyloxazolyl)]benzene] and the fluorescence spectra of POPOP, under conditions where the molecules were cooled in an ultrasonic helium jet. A line structure is observed in the spectra of POPOP and TOPOT; for the BPO molecules, whose configuration changes considerably during electronic excitation, vibrational structure is apparent only in the low-frequency region of the excitation spectrum, and a diffuse spectrum is recorded starting from ν00 + 200 cm−1. For all the compounds, in the spectra we recorded vibrations with frequencies up to 100 cm−1, arising due to the flexibility of the molecular structure. The rotational contours of the lines for the electronic and vibronic transitions of the POPOP molecules (Trot = 10.5 K) and TOPOT molecules (Trot = 15 K) are structureless and bell-shaped. The degree of polarization of the fluorescence Pfl for the jet-cooled POPOP molecules for excitation of vibrations along the absorption band up to 2000 cm−1 above ν00 is practically constant (∼8.4%) and matches Pfl for high-temperature vapors. More... »

PAGES

815-821

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10812-006-0160-7

DOI

http://dx.doi.org/10.1007/s10812-006-0160-7

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1046835833


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