35th Winter School on Wave and Quantum Acoustics
J. Bodzenta, M. Dzida and T. Pustelny
J. Phys. IV France 137 (2006) 331-340
DOI: 10.1051/jp4:2006137064

Intramolecular interactions in porphyrin - labelled polymers studied by spectroscopic, photothermal and photoelectric examinations

A. Siejak¹, D. Wróbel¹ and Yu.S. Avlasevich<sup>2, 3

1</sup>  Institute of Physics, Poznan University of Technology, Nieszawska 13A, 60965 Poznan, Poland
²  Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 F. Skaryna Ave., 220072 Minsk, Belarus
³  Present address: Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany

(Published online 23 December 2006)

Abstract
The aim of this study is characterization of photophysical properties of newly synthesized porphyrin-labelled polymers in aqueous solution, methanol and dioxane. The copper, zinc and free base tetraphenylporphyrins (CuTPP, ZnTPP and H₂TPP) covalently linked to polyethylene glycol (PEG) or poly(N)isopropylacrylamide (PNIPAM) were investigated. Absorption, fluorescence and photothermal properties were determined in order to follow deactivation pathways of radiative and non-radiative processes of the excited states of the porphyrin molecules in the polymeric systems and some intramolecular interactions. The spectroscopic experiments were supported by the photoelectric studies of the investigated systems in a photoelectrochemical cell. It was shown that the polymers cause the changes in electronic distribution in porphyrin covalently linked to the polymeric chain and can lead to enhancement of the photoactivity of the porphyrin species in light energy to electric energy conversion. The absorption, fluorescence and photothermal experiments showed the existence of the aggregated porphyrins, charge transfer in the dye-polymer systems.

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