Six alkyl peroxides and two acyl peroxides have been used to quench the excited triplet state of a series of photosensitizers. The quenching rate constants (kq) determined by laser flash photolysis were found to decrease at lower sensitizer triplet energies; however, the falloff slope was only 16% as steep as the -0.73 mol kcal'1 characteristic of normal energy transfer. The low slope is rationalized in terms of a repulsive peroxide excited state. Peroxides which are more thermally labile are generally better quenchers of a given sensitizer. Electron transfer is considered but it is concluded that the peroxides studied here undergo ordinary exchange energy transfer.
Blitzlicht‐Pyrolyse der isomeren Methylfurfurylbenzoate (I) bzw. (IV) führt zu einem Gemisch aus dem Cyclobutenon (II) und dem Cyclooctadifuran (III) bzw. ausschließlich zu (III).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.