Photochemical Action Plots Reveal Red‐shifted Wavelength‐dependent Photoproduct Distributions

Abstract

AbstractPhotochemical action plots are a powerful tool for mapping photochemical reaction outcomes wavelength‐by‐wavelength. Typically, they map either the depletion of a reactant or the formation of a specific product as a function of wavelength. Herein, we exploit action plots to simultaneously map the formation of several photochemical products from a single chromophore. We demonstrate that the wavelength‐resolved mapping of two reaction products formed during the irradiation of a chalcone species not only shows wavelength dependence – exhibiting the typical strong red‐shift of the photochemical reactivity compared to the absorbance spectrum of the chromophore – but also a strong wavelength selectivity with remarkably different product distributions resulting from different irradiation wavelengths.