Photophysical properties of the phenoxazin dyes resazurin and resorufin in soybean lecithin microemulsions

A snapshot of the electrochemical reaction layer by using 3 dimensionally resolved fluorescence mapping

“… 18 – 20 The oxidized form RZ is only fairly fluorescent ( λ = 638 nm, φ = 0.11). 21 RF, which is electrogenerated through a two-electron irreversible reduction of RZ, is highly fluorescent ( λ = 592 nm, φ = 0.41). 21 Also, RF can be further reduced reversibly, through another 2-electron process, to the non-fluorescent DH.…”

“… 21 RF, which is electrogenerated through a two-electron irreversible reduction of RZ, is highly fluorescent ( λ = 592 nm, φ = 0.41). 21 Also, RF can be further reduced reversibly, through another 2-electron process, to the non-fluorescent DH. Therefore, the appearance and disappearance of fluorescence can be readily achieved in situ under potential control.…”

Organic dyes in illuminated manuscripts: a unique cultural and historic record

“…In brief, the main absorption band results from an allowed π-π* transition, which is observed at 570-580 nm in polar protic solvents and at 588 nm in polar aprotic nitrile solvents [36,38]. The formation of an ion pair or of a similar structure, with the capacity of disrupting the conjugation (e.g.…”

“…hydroxy-orcein 7-hydroxy-2-phenoxazone a,b amino-orcein 7-amino-2-phenoxazone a amino-orceimin 7-amino-2-phenoxazime a In order to understand the differences observed between the absorption maxima of hydroxyand amino-orcein chromophores, it is important to point out the main results of the spectroscopic characterization, including excited state properties, of hydroxy-orcein, also known as resorufin (table 1) [36][37][38]. In brief, the main absorption band results from an allowed π-π* transition, which is observed at 570-580 nm in polar protic solvents and at 588 nm in polar aprotic nitrile solvents [36,38].…”

Direct oxidative pathway from amplex red to resorufin revealed by in situ confocal imaging

“…1 It is also a highly fluorescent dye because upon excitation it reemits efficiently at a maximum of 583 nm with a typical quantum yield F RS = 0.41 in water at pH 8.5. 2 The molecular structure of RS comprises an electroactive iminoquinone moiety. The corresponding electrochemical behaviour is characterized by a bi-electronic reversible reduction of RS to the corresponding colourless dihydroresorufin (DH).…”