Abstract: Several D- π -A trimethyl-s-triazine derivatives were synthesized via aldol reaction with trimethyl-s-triazine as donors，and their steady-state，transient spectra were characterized. The molecular structure of the compounds was analyzed using density functional theory（DFT）. Combined with the conclusions of the computational model and the results of spectral characterization， the effect on optical properties related to the symmetry of molecular structures and different donors was discussed. The experimental results demonstrated that the designed molecular structure showed expected optical properties. These properties were mainly determined by the intramolecular charge transfer between the electron-donor unit D and the triazine-acceptor unit.

Key words: triazine, D-π-A, fluorescent materials