Synthesis, Crystal Structure, and Photophysical Properties of 4-(4-(Dimethylamino)phenyl)-6-phenylpyrimidin-2-amine

The pyrimidine core is present in a wide variety of compounds that show interesting fluorescent properties and have been used as pigments and dyes. In this research, we synthesized 4-(4-(dimethylamino)phenyl)-6-phenylpyrimidin-2-amine (compound 9) from chalcone (8) with 45% yield. We obtained monocrystals of 9 by slow evaporation of dichloromethane as a solvent. Additionally, we measured the photophysical properties of compound 9, and its absorption wavelength (λ_abs), molar absorption coefficient (ε), excitation wavelength (λ_exc) and emission wavelength (λ_em), as well as Stokes shift (Δλ), increase with increasing solvent polarity. These properties are all related to the stabilization of the excited state by the solvent.