Synthesis Of Carbazole Derivatives And Their Two - Photon Properties

In this paper, six kinds of Carbazole derivatives, C-Et C1、C-n-Bu C1、C-Ph C1、C-Et C2、C-n-Bu C2 and C-Ph C2,have been designed and synthesized. Their structures were characterized by elemental analysis, FT-IR and 1H NMR, respectively.Influence of Vilsmeie reaction conditions, including reactant proportion, reaction time, reaction solvent were studied on the yield and selectivity of monoformylated carbazole derivatives and diformylated carbazole derivatives. Subsequently, effect of reaction solvent on the yield and selectivity of cis-styryl and trans- styryl was investigated.Fluorescence spectra, electronic absorption and fluorescence quantum yieldΦof these carbazole derivatives have been measured, and influence of moleculer structures on the properties was discussed.Two-photon absorption (TPA) properties of the derivatives have been researched using the methods of nonlinear transmission and up-converted fluorescence emission. TPA cross-sections of the derivatives were measured using a method of TPA induced fluorescence. Third-order nonlinear parameters of the compounds have been tested by Z-scan including n2,β,χ(3) andγ.