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

Eduard Stadler; Anna Eibel; David Fast; Hilde Freißmuth; Christian Holly; Mathias Wiech; Norbert Moszner; Georg Gescheidt

doi:10.1039/c7pp00401j

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

Eduard Stadler^*, Anna Eibel, David Fast, Hilde Freißmuth, Christian Holly, Mathias Wiech, Norbert Moszner, Georg Gescheidt

^*Corresponding author for this work

Institute of Physical and Theoretical Chemistry (6350)

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	660-669
Number of pages	10
Journal	Photochemical & Photobiological Sciences
Volume	17
Issue number	5
DOIs	https://doi.org/10.1039/c7pp00401j
Publication status	Published - 1 Jan 2018

ASJC Scopus subject areas

Physical and Theoretical Chemistry

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10.1039/c7pp00401j

Cite this

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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.",

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AU - Stadler, Eduard

AU - Eibel, Anna

AU - Fast, David

AU - Freißmuth, Hilde

AU - Holly, Christian

AU - Wiech, Mathias

AU - Moszner, Norbert

AU - Gescheidt, Georg

PY - 2018/1/1

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AB - 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.

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

Abstract

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