Synthesis And Characterization Of Triphenyl Derivatives

A novel high solubility, violet or blue-light fluorescent triphenyl compounds containing a flexible long-chain(-OC4H9,-OC8H17,-OC12H25,-OC14H29)were synthesized for the first time in the dioxane-ethanol-water homogeneous system by Suzuki Reaction. It was prepared with p-boronobenzoic acid and alkoxy bromobenzene in the presence of PdCl2-EDTA.Their chemical structures were confirmed by a variety of techniques including 1H NMR and FT-IR. The thermodynamic properties were investigated by the means of DSC. The optical properties were detected with UV and fluorescence spectra. The thermal stability and luminous efficiency of triphenyl derivatives with different alkoxy were investigated. Conclusions:1.We optimized the synthetic route and reaction condition. Though a large number of experiments we find that with PdCl2-EDTA as a catalyst and dioxane/ethanol/water as the solvent reaction triple homogeneous system the highest yield of benzene, the reaction time shorter and simple treatment.2.These compounds had relatively high thermal stability and decomposition temperature was above 300℃from DSC and TG spectrums.3. With the increase of branched-chain carbon atoms the blue shift is enhanced from the fluorescence spectrum; the blue shift was caused by long alkyl chain distorting triphenyl conjugate plane, weaking theπelectronic system of aromatic ring, leading to blue shift; the fluorescence intensity is affected the fluorescence self-quenching.