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Proceedings Paper

Study of spectral and photophysical properties of covalently linked porphyrin dimers
Author(s): Vladimir S. Chirvony; G. P. Gurinovich
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Paper Abstract

Unusual absorption and photophysical properties are revealed for a novel fixed-distance symmetric ethylene-bridged porphyrin dimer, trans-1,2-bis(meso-octaethylporphyrinyl)ethene (tbis equals OEP in short), investigated by the methods of absorption and fluorescence steady- state spectroscopies as well as picosecond fluorescence and femtosecond transient absorption time-resolved spectroscopies. It is found that in solutions of organic solvents, tbis equals OEP exists in two isomeric forms: an isomer P, and an isomer U (ca. 85% and 15%, respectively, in toluene). It was found that lifetimes of the lowest excited singlet states of both isomers are strongly dependent on solvent viscosity, the isomer U displaying the stronger dependence. Particularly, the fluorescence lifetime of the isomer U was found to increase to approximately 0.5 ns in polymer films at room temperature or in rigid glasses of organic solvents at 77 K. To the best of our knowledge, this is the first example of such viscosity-dependent photophysics for porphyrins. A qualitative explanation of these observations is proposed.

Paper Details

Date Published: 2 January 1995
PDF: 10 pages
Proc. SPIE 2370, 5th International Conference on Laser Applications in Life Sciences, (2 January 1995); doi: 10.1117/12.197469
Show Author Affiliations
Vladimir S. Chirvony, Institute of Molecular and Atomic Physics (Belarus)
G. P. Gurinovich, Institute of Molecular and Atomic Physics (Belarus)

Published in SPIE Proceedings Vol. 2370:
5th International Conference on Laser Applications in Life Sciences
Pavel A. Apanasevich; Nikolai I. Koroteev; Sergei G. Kruglik; Victor N. Zadkov, Editor(s)

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