Phenothiazine

Phenothiazine, 1-bromobutane, benzyl and 4-tert-butylaniline were obtained from Energy Chemical (China). All the other reactants and solvents were obtained from commercial sources. All organic solvents used in this study were dried with the suitable desiccants and freshly distilled prior to the relevant reactions.
The NMR spectrum was measured on Bruker 500. The mass spectrum was recorded using a Bruker Esquire 3000 mass spectrometer. Thermogravimetric analysis (TGA) was performed on Shimadzu thermal analyzer in Japan. The UV-vis absorption spectrum was recorded on a Shimadzu UV-2550 spectrometer. The cyclic voltammogram was performed on an electrochemical analyzer (CHI Instruments 760 B). At room temperature, using Edinburgh instrument FLS920 integrating sphere and Xe lamp, the quantum yield of photoluminescence was measured by the absolute method. At room temperature, the Edinburgh instrument FLS920 was used with a microsecond ash lamp as the excitation source (repetition frequency 90 Hz), and the photoluminescence decay lifetime was measured by a timecorrelated single photon counting spectrometer.
The synthesis process of the intermediates, 10-butyl-10H-Phenothiazine-3-carbaldehyde and 10-butyl-10H-Phenothiazine-3,7-dicarbaldehyde, were described in our previous paper [35] .