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Determination of photoredox properties of individual kinetically labile complexes in equilibrium systems

František Šimo and Jozef Šima

Institute of Inorganic Chemistry, Technology and Materials, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovakia

 

E-mail: jozef.sima@stuba.sk

Abstract: The paper evaluates the possibilities and limitations in characterising photochemical properties of individual kinetically labile species being in mutual equilibrium. A model of calculating quantum yield values is elaborated and applied to azidokojic iron(III) complexes in aqueous solutions. Based on the known speciation of the complexes as a function of pH, Fe(III) and azidokojic acid concentrations, electronic absorption spectra of individual species, and the determined overall quantum yield of Fe(II) photoformation at irradiation with monochromatised radiation at 366 nm, the quantum yield of Fe(III) to Fe(II) photoreduction was obtained for each of the complexes present in the investigated systems.

Keywords: iron(III) photoreduction – quantum yield – speciation – labile complexes – radiation absorption – photoreactivity model

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-011-0058-6

 

Chemical Papers 65 (5) 730–734 (2011)

Monday, June 17, 2024

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