PHENOTHIAZINE-CARBOXALDEHYDE-HYDRAZONE DERIVATIVES SYNTHESIS, CHARACTERIZATION AND ELECTRONIC PROPERTIES

Phenothiazine-carboxaldehyde-hydrazones and bis-hydrazones were prepared by the microwave assisted condensation of 10-methylphenothiazine-3-carboxaldehyde and 10-methyl-phenothiazine-3,7-dicarboxaldehyde respectively, with different substituted hydrazine derivatives in good yields and very short reaction time (3 min). Structural assignments of the new hydrazones were based on mass spectrometry, FT-IR and high resolution NMR spectroscopy analyses; some of the molecular structures were confirmed by X-ray diffraction on single crystals. The electronic properties were examined by absorption/emission UV-Vis spectroscopy and cyclic voltammetry. N,N-Dimethyl-hydrazones show fluorescence in both solution and aggregated state.