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2 January 1995 Dynamics of self-organized porphyrin aggregates
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Proceedings Volume 2370, 5th International Conference on Laser Applications in Life Sciences; (1995)
Event: Laser Applications in Life Sciences: 5th International Conference, 1994, Minsk, Belarus
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.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Eduard I. Zenkevich, Alexander M. Shulga, Andrei Chernook, Ulrich Rempel, and Christian von Borczyskowski "Dynamics of self-organized porphyrin aggregates", Proc. SPIE 2370, 5th International Conference on Laser Applications in Life Sciences, (2 January 1995);

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