Synthesis and Optical Properties, Including Two-Photon Absorption Cross-Sections, of Differentially Functionalized Starburst-Type π-Conjugated Molecules
A Synthetic Strategy Leading to Monodisperse PPV Oligomers by Coupling Reactions of Vinyltrimethylsilanes
作者:Francesco Babudri、Gianluca M. Farinola、Linda C. Lopez、Maria G. Martinelli、Francesco Naso
DOI:10.1021/jo001795v
日期:2001.6.1
novel strategy for the synthesis of well-defined oligo(phenylenevinylene)s was developed. The procedure is entirely based upon two coupling processes, both involving vinyltrimethylsilanes. Bis(styryl)benzenes 2a-g bearing two octyloxy groups in the central aromatic ring and various substituents on the external aromatic rings were prepared in good yield by a regio- and stereoselective coupling reaction of
Synthesis and Optical Properties, Including Two-Photon Absorption Cross-Sections, of Differentially Functionalized Starburst-Type π-Conjugated Molecules
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.