A versatile method for the determination of photoc

A versatile method for the determination of photochemical quantum yields via online UV-Vis spectroscopyPhotochemical&PhotobiologicalSciencesPAPERCitethis:Photochem.Photobiol.Sci.,2018,17,660Received27thOctober2017,Accepted11thApril2018DOI:10.1039/c7pp00401jrsc.li/ppsAversatilemethodforthedeterminationofphotochemicalquantumyieldsviaonlineUV-Visspectroscopy†EduardStadler,*aAnnaEibel,aDavidFast,aHildeFreißmuth,aChristianHolly,aMathiasWiech,aNorbertMosznerbandGeorgGescheidt*aWehavedevelopedasimplemethodfordeterminingthequantumyieldsofphoto-inducedreactions.OursetupfeaturesafibrecoupledUV-Visspectrometer,LEDirradiationsources,andacalibratedspectro-photometerforprecisemeasurementsoftheLEDphotonflux.Theinitialslopeintime-resolvedabsor-banceprofilesprovidesthequantumyield.Weshowthefeasibilityofourmethodologyforthekineticanalysisofphotochemicalreactionsandquantumyielddetermination.Thetypicalchemicalactinometers,ferrioxalateandortho-nitrobenzaldehyde,aswellasriboflavin,aspiro-compound,phosphorus