Abstract
Herein, we give a retrospective overview and analyze recent developments in the field of chemiluminescence derived from organic oxidation processes (so called oxychemiluminescence), most prominently, mediated by peroxy radicals. As evidenced from the presented analysis, the diversities of the reaction and the excited-state-generation mechanisms are governed mainly by a diverse chemical nature of substrates being oxidized. The notable oxychemiluminescence cases, which involve peroxy radicals as key reactive species, refer to oxidation of saturated and unsaturated hydrocarbons, polymers, lipids and proteins. The general feature of the considered chemiluminescence processes pertains to a formation of high-energy cyclic intermediates (tetroxides and/or dioxetanes), whose cleavage yields electronically excited products. The considered modes of the chemiluminescence enhancement encompass the energytransfer and the electron-transfer mechanisms. Most prominent application of the discussed oxychemiluminescence phenomenon resides in a versatile chemiluminescent assay to monitor antioxidants (both their concentration and reactivity) in chemical and biological media.
Highlights
IntroductionThe emission of light, derived either from chemical processes (chemiluminescence) or living organisms (bioluminescence), is of prime interest for both pure and applied science
The emission of light, derived either from chemical processes or living organisms, is of prime interest for both pure and applied science
As for the lanthanide complexes, the efficient triplet-energy acceptors in hydrocarbon solutions, these chemiluminescence enhancers become unstable in biological suspensions since they dissociate in the presence of phosphates and influence kinetics of lipid peroxidation.[117,118]
Summary
The emission of light, derived either from chemical processes (chemiluminescence) or living organisms (bioluminescence), is of prime interest for both pure and applied science. Studies on chemi- and bioluminescence provide relevant insights for understanding the fundamentals of energy conversion in numerous fields of chemistry and biology and for scrutinizing the reaction mechanisms These light-emission phenomena are of great import for numerous commercial applications, first of all, for modern analytical techniques. In this context, the diversities of light-generating processes and modes of their harnessing are impressive.[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16] The subject matter of the present contribution encompasses salient facets of chemiluminescence derived from oxidation of organic substrates, most prominently, mediated by peroxy radicals. This refers to the relevant aspects of photochemistry, photophysics, oxidation and peroxide chemistry
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