Diffusion-controlled sensitization of photocleavage reactions on surfaces


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WÖLL, Dominik, Nikita LUKZEN, Ulrich STEINER, 2012. Diffusion-controlled sensitization of photocleavage reactions on surfaces. In: Photochemical & Photobiological Sciences. 11(3), pp. 533-538. ISSN 1474-905X. eISSN 1474-9092

@article{Woll2012Diffu-19091, title={Diffusion-controlled sensitization of photocleavage reactions on surfaces}, year={2012}, doi={10.1039/C1PP05319A}, number={3}, volume={11}, issn={1474-905X}, journal={Photochemical & Photobiological Sciences}, pages={533--538}, author={Wöll, Dominik and Lukzen, Nikita and Steiner, Ulrich} }

2012-04-20T07:11:05Z Diffusion-controlled sensitization of photocleavage reactions on surfaces 2013-01-29T23:25:04Z Publ. in: Photochemical & Photobiological Sciences ; 11 (2012), 3. - S. 533-538 Wöll, Dominik 2012 deposit-license Steiner, Ulrich Wöll, Dominik eng Steiner, Ulrich The kinetic rate equation for the photosensitized cleavage reaction of surface-bound photolabile chromophores with free diffusion of sensitizer molecules from the bulk of a solution to the surface is derived by determining the stationary solution of a diffusion equation with suitable boundary conditions. The relation between the phenomenological rate constant for the photosensitized reaction at the surface and in the bulk is established. Applying the result to the analysis of an experimental example, the origin of the quasi zeroth-order kinetics of the sensitized reaction is revealed. A theoretical comparison of intramolecular sensitization in photocleavable protecting groups with a molecular antenna and sensitization with the freely diffusing sensitizer shows that in a typical case sensitization with free diffusion is more effective than intramolecular sensitization for sensitizer concentrations higher than 5 mM. Lukzen, Nikita Lukzen, Nikita

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