Synthesis,characterization and third-order nonlinear optical properties of bromo[tri-alpha-(2,4-dimethyl-3-pentyloxy) subphthalocyanine]boron complex

摘要

A new subphthalocyanine complex,bromo[tri-alpha-(2,4-dimethyl-3-pentyloxy)subphthalocyanine]boron,has been synthesized and characterized by elemental analysis,MALDI-TOF-MS,FT-IR and UV-vis spectroscopy.Its third-order nonlinear optical (NLO) properties in ethanol solution have been studied by Z-scan technique using 8 ns laser pulses at 532 nm.The results reveal that the new complex exhibits strong NLO absorption effect (alpha_2 = 3.7 X 10~(-10) mW~(-1)) and self-focusing refractive performance (alpha2 = 2.1 x l0~(-17) m~2 W~(-1)).The effective third-order NLO susceptibility (CHI~((3))) and the molecular second-order hyperpolarizability (gamma) value were calculated to be 1.12 x 10~(-11) and approx 6.8 x 10~(-28) esu,respectively.All of the values are comparable to those of the reported good NLO materials.In addition,the effects of cone-shaped molecular structure and axially heavy-atom (Br) substitution on third-order NLO properties are discussed.