CC BY 3.0 UnportedZhang, YingHeberle, MartinWächtler, MariaKarnahl, MichaelDietzek, Benjamin2022-06-242022-06-242016https://oa.tib.eu/renate/handle/123456789/9272https://doi.org/10.34657/8310A combination of UV-Vis and resonance Raman spectroscopy in conjunction with electrochemistry is employed to reveal the nature of a side product formed when using heteroleptic Cu(I)-photosensitizers [(P^P)Cu(N^N)]+ for photocatalytic hydrogen generation. It is shown that homoleptic [Cu(N^N)2]+ complexes are formed under oxidative conditions confirming a proposed deactivation pathway.enghttps://creativecommons.org/licenses/by/3.0/540Copper compoundsPhotosensitizersSpectroelectrochemistryDeactivation pathwaysHeterolepticOxidative conditionsPhoto-catalyticPhotocatalytic hydrogenResonance Raman spectroelectrochemistriesResonance Raman spectroscopySide productsHydrogen productionArticle