Design, Synthesis And Properties Of High Flourescent Cyanostilbene Derivatives

Optoelectronic functional material is a hot topic in material field and plays a huge role in promoting social and economic development. Especially, the organic optoelectronic functional materials have the advantages of exact structure, easy purification, easy tailored and self-assembly, which have been widely applied in OLEDs, chemosensor and bioimaging. Recently, there are a great of organic optoelectronic functional materials with excellent properties have been reported. However, most of organic fluorophores have a lower luminous efficiency. To develop high emission materials is significant in theory and practice. According to the previous literature, in this paper, a series of novel α-cyanostilbene derivatives with excellent emissive properties have been designed and synthesized by introducing α-cyanostilbene to organic luminophors. Further, the boron complexes were synthesized using chelate groups functionalized α-cyanostilbene derivatives. Their photophysics properties were investigated using absorption spectra, fluorescence spectra and DFT calculations. The main research contents are as follow:1. The two type D-π-A and D-π-D α-cyanostilbene derivatives with different push-pull groups were designed and synthesized by Knoevenagel and Williamson reactions. FT-IR,1H NMR and 13C NMR were used to characterize their structure. Their photophysics properties were investigated by absorption spectra, fluorescence spectra and DFT calculations. The steric effect and electron effect of alkoxy have a deeply effect on the photophysics properties of compounds.2. Compounds with intramolecular FRET properties have been designed and synthesized, which were characterized by FT-IR,1H NMR and 13C NMR. Their photophysics properties were investigated using absorption spectra, fluorescence spectra and DFT calculations. The results showed that the efficiently intramolecular FRET was occurred through connecting donor of the α-cyanostilbene derivatives with excellent emissive properties with acceptor by alkyl group to one molecule.3. α-Cyanostilbene Schiff base derivatives and their boron complexes have been designed and synthesized and characterized by FT-IR,1H NMR and 13C NMR. The properties were preliminarily investigated by absorption spectra, fluorescence spectra and DFT calculations. Comparing to the ligands, the molar absorption coefficients and emission of the boron complexes were highly enhancement.