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Proceedings Paper

Dynamics of self-organized porphyrin aggregates
Author(s): Eduard I. Zenkevich; Alexander M. Shulga; Andrei Chernook; Ulrich Rempel; Christian von Borczyskowski
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Paper Abstract

Supramolecular ensembles stable at room temperature (complexation constant and activation energy range from 5 (DOT) 106 M-1 to 5 (DOT) 107 M-1 and from 0.5 to 1.0 eV correspondingly) containing up to five macrocyclic fragments have been constructed using two-fold ligation of Zn-porphyrin and Zn-chlorin chemical dimers by pyridyl substituted porphyrin or related molecules. Spectral, photophysical and thermodynamic properties of triadic and pentadic arrays have been studied in a temperature range from 140 to 360 K. Kinetic behavior of the complexes was investigated using a fluorescent picosecond laser setup ((Delta) t approximately equals 30 ps) with 2-D (wavelength-lifetime) registration. Observed spectral properties are explained in terms of extra-ligation (red shift of all electronic bands <EQ 550 cm-1)) and excitonic splitting ((Delta) E < 1900 cm-1). Nonradiative for- and backward excitation energy transfer (K > 1010 c-1), electron transfer and d-(pi) interactions are discussed as the main paths of electronic excitation deactivation in the complexes.

Paper Details

Date Published: 2 January 1995
PDF: 5 pages
Proc. SPIE 2370, 5th International Conference on Laser Applications in Life Sciences, (2 January 1995); doi: 10.1117/12.197430
Show Author Affiliations
Eduard I. Zenkevich, Institute of Molecular and Atomic Physics (Belarus)
Alexander M. Shulga, Institute of Molecular and Atomic Physics (Belarus)
Andrei Chernook, Institute of Molecular and Atomic Physics (Belarus)
Ulrich Rempel, Technische Univ. Chemnitz-Zwickau (Germany)
Christian von Borczyskowski, Technische Univ. Chemnitz-Zwickau (Germany)

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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