Absorption and fluorescence spectroscopic characterisation of a phenothiazine–flavin dyad

The Ugi Four‐Component Reaction Route to Photoinducible Electron‐Transfer Systems

“…[18] The fluorescence emission of AQ is even weaker and its fluorescence quantum yield is too low to be determined. For the dyad 1 the fluorescence emission was so faint that no signal could be recorded.…”

Photo-induced dynamics in a pyrene–isoalloxazine(flavin)–phenothiazine triad

“…The fluorescence quantum yields are / F (PYFPT, dichloromethane) % 3 · 10 À4 and / F (PYFPT, acetonitrile) % 2.4 · 10 À4 . The fluorescence of the isoalloxazine moiety is reduced approximately by a factor of 500 compared to the BMF fluorescence efficiency [62]. The reduction is approximately the same as in the case of the dyad PPF [62].…”

“…2a and b, respectively. The absorption cross-section spectra of the approximate constituents 10-(4-bromophenyl)-3-methylisoalloxazine (BMF) [62], 10-heptyl-3-phenylphenothiazine (PPT) [62], and 1-methylpyrene (PYM) [63] in dichloromethane (for structural formulae see Fig. 1) are included in Fig.…”

“…Emphasis is given to the mutual electronic interaction between the isoalloxazine, the pyrene, and the phenothiazine subunits. The photo-induced dynamics of the pyrene-flavin-phenothiazine triad PYFPT is compared with the photo-induced dynamics of the previously studied phenothiazine-isoalloxazine dyad PPF [62,69] and pyrene-isoalloxazine dyad PFD [63,69] (see structural formulae in Fig. 1).…”

“…The photo-dynamics of a pyrene-flavine dyad and of a phenothiazine-flavin dyad were analysed in [63,69] and [62,69], respectively.…”