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Zeitschrift für Naturforschung A

A Journal of Physical Sciences

Editor-in-Chief: Holthaus, Martin

Editorial Board: Fetecau, Corina / Kiefer, Claus


IMPACT FACTOR 2016: 1.432

CiteScore 2017: 1.30

SCImago Journal Rank (SJR) 2017: 0.403
Source Normalized Impact per Paper (SNIP) 2017: 0.632

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1865-7109
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Volume 48, Issue 12

Issues

Monomer and Excimer Fluorescence of 2-Phenylindole in p-Xylene at 20 °C Studied by Frequency-Domain Fluorometry

A. Kawski
  • Luminescence Research Group, Institute of Experimental Physics, University of Gdansk, 80-952 Gdansk, Poland
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ I. Gryczyński
  • Center for Fluorescence Spectroscopy, Department of Biological Chemistry, University of Maryland, Baltimore MD 21201, USA
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  • De Gruyter OnlineGoogle Scholar
/ B. P. Maliwal
  • Center for Fluorescence Spectroscopy, Department of Biological Chemistry, University of Maryland, Baltimore MD 21201, USA
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  • De Gruyter OnlineGoogle Scholar
/ G. Piszczek
  • Luminescence Research Group, Institute of Experimental Physics, University of Gdańsk, 80-952 Gdańsk, Poland
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Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/zna-1993-1204

Abstract

The effect of 2-phenylindole (2PI) concentration in p-xylene upon the fluorescence decay time was investigated by frequency-domain fluorometry. The fluorescence decay of a dilute (10~ 5 M) 2PI solution in p-xylene at 20 °C is single exponential with the mean decay time t = 1.87 ns and practically independent of the observation wavelength (A obs) in the fluorescence band. The fluores-cence decay in a highly concentrated solution (6 x 10" 3 M) is heterogenic and depends on A obs . For a given modulation frequency (~ 200 Hz), the fluorescence phase shifts at the longwave observation (440-480 nm) distinctly exceed 90°, thus clearly indicating that the observed (excimer) fluorescence results from a process taking place in the excited state. The fluorescence decays were measured at seven values of A obs (360-480 nm), and all the results were analyzed comprehensively (tj and t 2 are equal for all A obs ; the amplitudes are different). The lifetimes of the excimer state is relatively short (~3.5 ns). Radiative (r e) and non-radiative (t,) rate constants for monomer fluorescence of 2PI in p-xylene were determined using appropriate data from photo-and radioluminescence measure-ments.

About the article

Received: 1993-09-10

Published Online: 2014-06-02

Published in Print: 1993-12-01


Citation Information: Zeitschrift für Naturforschung A, Volume 48, Issue 12, Pages 1173–1176, ISSN (Online) 1865-7109, ISSN (Print) 0932-0784, DOI: https://doi.org/10.1515/zna-1993-1204.

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© 1946 – 2014: Verlag der Zeitschrift für Naturforschung. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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