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Issue 5, 2018
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A versatile method for the determination of photochemical quantum yields via online UV-Vis spectroscopy

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Abstract

We have developed a simple method for determining the quantum yields of photo-induced reactions. Our setup features a fibre coupled UV-Vis spectrometer, LED irradiation sources, and a calibrated spectrophotometer for precise measurements of the LED photon flux. The initial slope in time-resolved absorbance profiles provides the quantum yield. We show the feasibility of our methodology for the kinetic analysis of photochemical reactions and quantum yield determination. The typical chemical actinometers, ferrioxalate and ortho-nitrobenzaldehyde, as well as riboflavin, a spiro-compound, phosphorus- and germanium-based photoinitiators for radical polymerizations and the frequently utilized photo-switch azobenzene serve as paradigms. The excellent agreement of our results with published data demonstrates the high potential of the proposed method as a convenient alternative to the time-consuming chemical actinometry.

Graphical abstract: A versatile method for the determination of photochemical quantum yields via online UV-Vis spectroscopy

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Publication details

The article was received on 27 Oct 2017, accepted on 11 Apr 2018 and first published on 01 May 2018


Article type: Paper
DOI: 10.1039/C7PP00401J
Citation: Photochem. Photobiol. Sci., 2018,17, 660-669
  • Open access: Creative Commons BY-NC license
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    A versatile method for the determination of photochemical quantum yields via online UV-Vis spectroscopy

    E. Stadler, A. Eibel, D. Fast, H. Freißmuth, C. Holly, M. Wiech, N. Moszner and G. Gescheidt, Photochem. Photobiol. Sci., 2018, 17, 660
    DOI: 10.1039/C7PP00401J

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