2,7-二(3-(氰基)苯基)-9,9-二乙基芴的合成、晶体结构及光学性质

Abstract

A new fluorene derivative,2,7-bis(3-cyanophenyl)-9,9-diethyl-fluorene has been synthesized and characterized by elemental analysis,FT-IR spectra,1 H NMR and X-ray single crystal diffraction.The compound crystallizes in orthorhombic,space group Pnma with a = 1.380 0(3) nm,b = 2.230 6(4) nm,c = 0.726 33(15) nm,V = 2.235 8(8) nm 3,Z =4,D c = 1.261 g / cm 3,μ(MoKα) =0.073 mm-1,F(000) =896,S = 1.013,the final R = 0.046 9 and wR = 0.104 2.The UV-Vis absorption and fluorescence spectra of the title compound were investigated.Under excitation of 330 nm at room temperature,the compound showed intense blue fluorescence with an emission peak of 408 nm.The fluorescence quantum yield of the title compound in CH 2 Cl 2 solution is 0.64 and the Stokes shift between the UV-Vis absorption and fluorescence maxima is 56 nm for the film.This compound may be suitable as a promising candidate for blue-emitting material.