Differentially functionalized hexakis( p-substituted-phenylethynyl)benzene and hexakis[4-( p-substituted-styryl)phenylethynyl]benzene derivatives with various (D6h, D3h, D2h, and C2v) symmetries were synthesized by Sonogashira cross-coupling reactions. The optical properties of this starburst-type π-conjugated system were investigated. Among them, hexakis[4-( p-dioctylaminostyryl)phenylethynyl]benzene (5) showed the largest two-photon absorption cross-section of δ = 818 GM at 800 nm, which was determined by open aperture Z-scan with 120 fs laser pulses in toluene solution.
通过 Sonogashira 交叉偶联反应合成了不同对称性(D6h、D3h、D2h 和 C2v)的不同官能化六(对取代
苯乙炔基)
苯和六[4-(对取代
苯乙烯基)
苯乙炔基]
苯衍
生物。研究了这种星爆型 π 共轭体系的光学性质。其中,六[4-( 对二辛基
氨基
苯乙烯基)
苯乙炔基]
苯(5)在 800 纳米波长处显示出最大的双光子吸收截面δ = 818 GM,这是通过在
甲苯溶液中使用 120 fs 激光脉冲进行开孔 Z 扫描测定的。