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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting
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Autocatalytic Electrochemiluminescence

Claudia Martinez Asenjo1, Francesco Petrini2, Alessandro Fracassa1

  • 1Department of Chemistry "Giacomo Ciamician", Alma Mater Studiorum - University of Bologna, Bologna, 40129, Italy.

Angewandte Chemie (International ed. in English)
|December 31, 2025
PubMed
Resumen

Un nuevo sistema autocatalítico de electroluminiscencia (ECL) utiliza radicales de oxalato y peroxidisulfato para reducir el potencial de activación a -0,2 V. Este avance permite una generación de luz eficiente para aplicaciones avanzadas de biosensación e imagen.

Palabras clave:
ElectrocatálisisElectroluminiscenciaElectroquímicaMicroscopíaSimulación

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