Dynamics of self-organized porphyrin aggregates

Eduard I. Zenkevich; Alexander M. Shulga; Andrei Chernook; Ulrich Rempel; Christian von Borczyskowski

doi:10.1117/12.197430

2 January 1995 Dynamics of self-organized porphyrin aggregates

Eduard I. Zenkevich, Alexander M. Shulga, Andrei Chernook, Ulrich Rempel, Christian von Borczyskowski

Proceedings Volume 2370, 5th International Conference on Laser Applications in Life Sciences; (1995) https://doi.org/10.1117/12.197430
Event: Laser Applications in Life Sciences: 5th International Conference, 1994, Minsk, Belarus

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.

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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); https://doi.org/10.1117/12.197430

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