Extra-ligation and screening effects upon interaction of photoinduced excited states of multiporphyrin arrays with molecular oxygen in solutions

Eduard I. Zenkevich; E. I. Sagun; Valentin N. Knyukshto; Alexander M. Shulga; Christian von Borczyskowski

doi:10.1117/12.468916

30 May 2002 Extra-ligation and screening effects upon interaction of photoinduced excited states of multiporphyrin arrays with molecular oxygen in solutions

Eduard I. Zenkevich, E. I. Sagun, Valentin N. Knyukshto, Alexander M. Shulga, Christian von Borczyskowski

Author Affiliations +

Proceedings Volume 4749, ICONO 2001: Novel Trends in Nonlinear Laser Spectroscopy and Optical Diagnostics and Lasers in Chemistry, Biophysics, and Biomedicine; (2002) https://doi.org/10.1117/12.468916
Event: XVII International Conference on Coherent and Nonlinear Optics (ICONO 2001), 2001, Minsk, Belarus

Abstract

In this work we present the results showing how the extra-ligation, spacer properties and porphyrin macrocycle screening may influence on the conformational dynamics and photophysical properties of multiporphyrin arrays as well as on their interaction with molecular oxygen in solutions at 293 K. Steady-state and time-resolved studies indicate that for a sequence of porphyrin or chlorin chemical dimers Zn- cyclodimer yields (ZnOEP)₂Ph yields (ZnOEP)₂ yields (ZnOEChl)₂ with relative lowering of excited S₁- and T₁-states, the extra-ligation by pyridine does not influence essentially on fluorescence parameters but leads to an increase of T₁-states non-radiative decay. At 293 K the T₁-state quenching by O₂ for Zn-dimer- pyridine complexes depends on the nature and flexibility of the spacer between macrocycles and donor-acceptor interactions with pyridine. In triads and pentads the dimeric subunit plays the role of screen weakening O₂ interaction with the second subunit. As a result, the T₁-state quenching by O₂ in triads and pentads is decreased by 50 divided by 70 percent with respect to that for the corresponding individual monomers.

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Eduard I. Zenkevich, E. I. Sagun, Valentin N. Knyukshto, Alexander M. Shulga, and Christian von Borczyskowski "Extra-ligation and screening effects upon interaction of photoinduced excited states of multiporphyrin arrays with molecular oxygen in solutions", Proc. SPIE 4749, ICONO 2001: Novel Trends in Nonlinear Laser Spectroscopy and Optical Diagnostics and Lasers in Chemistry, Biophysics, and Biomedicine, (30 May 2002); https://doi.org/10.1117/12.468916

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