摘要
Polyphenylene dendrimers 11,12 and 13 containing terminal trimethylsilyl groups have been synthesized by phosphine-free palladium chloride catalyzed Suzuki couplings of 1,3,5-tris(3′,5′-dibromophenyl)benzene 9 with aryl boronic acids 5 and 6.These macromolecules were characterized by Fourier transform infrared (FTIR),nuclear magnetic resonance (NMR) and matrix assisted laser desorption/ionization time of flight (MALDI-TOF) mass spectra.Gel permeation chromatograph (GPC) indicated that the hydrodynamic radium of 12,with trimethylsiliyl (—TMS) groups substituted at para-positions on its terminal benzene rings,was larger than that of 13,with trimethylsiliyl groups substituted at meta-positions on its terminal benzene rings.X-ray powder diffraction patterns showed that dendrimer 12 was of a certain amount of crystallinity and dendrimer 13 was amorphous.
Polyphenylene dendrimers 11,12 and 13 containing terminal trimethylsilyl groups have been synthesized by phosphine-free palladium chloride catalyzed Suzuki couplings of 1,3,5-tris （3＇, 5＇-dibromophenyl） benzene 9 with aryl boronic acids 5 and 6. These macromolecules were characterized by Fourier transform infrared （FTIR）, nuclear magnetic resonance （NMR） and matrix assisted laser desorption/ionization time of flight （MALDI-TOF） mass spectra. Gel permeation chromatograph （GPC） indicated that the hydrodynamic radium of 12, with trimethylsiliyl （-TMS） groups substituted at para-positions on its terminal benzene rings, was larger than that of 13, with trimethylsiliyl groups substituted at meta-positions on its terminal benzene rings. X-ray powder diffraction patterns showed that dendrimer 12 was of a certain amount of crystallinity and dendrimer 13 was amorphous.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2006年第3期523-527,共5页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号50273021)资助项目
