title: Red-hair-inspired chromogenic system based on a proton-switched dehydrogenative free-radical coupling.
abstract: In the presence of micromolar peroxides or biometals (Fe(III), Cu(II), V(V) salts), and following a strong acid input, the stable 3-phenyl-2H-1,4-benzothiazine is efficiently converted to a green-blue Δ(2,2')-bi(2H-1,4-benzothiazine) chromophore via dehydrogenative coupling of a 1,4-benzothiazinyl radical. The new system is of potential practical interest for colorimetric peroxide and redox biometal detection.
authors.affiliation: Department of Chemical Sciences, University of Naples "Federico II" , Via Cinthia 4, I-80126 Naples, Italy, Department of Chemistry "Ciamician", University of Bologna , Via S. Giacomo 11, I-40126 Bologna, Italy, and Scuola Normale Superiore , Piazza dei Cavalieri 7, I-56126 Pisa, Italy.
authors.forename: Loredana
authors.initials: L
authors.lastname: Leone
authors.forename: Orlando
authors.initials: O
authors.lastname: Crescenzi
authors.forename: Riccardo
authors.initials: R
authors.lastname: Amorati
authors.forename: Luca
authors.initials: L
authors.lastname: Valgimigli
authors.forename: Alessandra
authors.initials: A
authors.lastname: Napolitano
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Barone
authors.forename: Marco
authors.initials: M
authors.lastname: d'Ischia
mesh_terms: D005609:Free Radicals / Q000737:chemistry*; D010084:Oxidation-Reduction; D010545:Peroxides / Q000737:chemistry*; D011522:Protons; D014131:Trace Elements / Q000032:analysis / Q000737:chemistry*
chemical_list: D005609:Free Radicals; D010545:Peroxides; D011522:Protons; D014131:Trace Elements