Poly（arylene ethynylene）s,P1 and P2 containing 1,3,5-triazine and chalcone unites respectively,were synthesized by Sonogashira coupling reaction.These polymers exhibited good solubility in common organic solvents,su...Poly（arylene ethynylene）s,P1 and P2 containing 1,3,5-triazine and chalcone unites respectively,were synthesized by Sonogashira coupling reaction.These polymers exhibited good solubility in common organic solvents,such as dichloromethane,chloroform,and tetrahydrofuran.The molecular weight Mw of P1 was 6390 with polydispersity（PDI） being 2.33 and that of P2 was 6870 with polydispersity（PDI） being 1.85 characterized by GPC.The photophysical properties were analyzed by solution and solid state photoluminescence spectroscopy.P1 emitted blue fluorescence at around 441 nm in CH2Cl2 or THF solutions under UV excitation.The photoluminescence behavior of P2 was dependent on the solvent,with green emitting light at around 550 in CH2Cl2 solution and 500 nm in THF solution.Powder photoluminescence spectra of P1 and P2 showed that the peak wavelengths respectively shifted to 530 and 605 nm.展开更多
The poly(2,5-dipentyloxy-para-phenylene ethynylene)(P) was synthesized by Pd-catalyzed Sonogashira coupling reaction.Due to causing energy transfer between the nitrobenzene’s quenchers and the polymer chains through ...The poly(2,5-dipentyloxy-para-phenylene ethynylene)(P) was synthesized by Pd-catalyzed Sonogashira coupling reaction.Due to causing energy transfer between the nitrobenzene’s quenchers and the polymer chains through the charge-transfer interaction,the fluorescence quenched properties of P varied obviously with the para-substituting group’s structure in the nitrobenzene derivatives.The fluorescence quenching efficiency of quenchers improved with increasing of electron repulsion capability of the para-substituting group.The fluorescence quenching efficiency increased nonlinearly with the concentration of the quenchers and had,however,no relation with the quenching time.展开更多
文摘Poly（arylene ethynylene）s,P1 and P2 containing 1,3,5-triazine and chalcone unites respectively,were synthesized by Sonogashira coupling reaction.These polymers exhibited good solubility in common organic solvents,such as dichloromethane,chloroform,and tetrahydrofuran.The molecular weight Mw of P1 was 6390 with polydispersity（PDI） being 2.33 and that of P2 was 6870 with polydispersity（PDI） being 1.85 characterized by GPC.The photophysical properties were analyzed by solution and solid state photoluminescence spectroscopy.P1 emitted blue fluorescence at around 441 nm in CH2Cl2 or THF solutions under UV excitation.The photoluminescence behavior of P2 was dependent on the solvent,with green emitting light at around 550 in CH2Cl2 solution and 500 nm in THF solution.Powder photoluminescence spectra of P1 and P2 showed that the peak wavelengths respectively shifted to 530 and 605 nm.
文摘The poly(2,5-dipentyloxy-para-phenylene ethynylene)(P) was synthesized by Pd-catalyzed Sonogashira coupling reaction.Due to causing energy transfer between the nitrobenzene’s quenchers and the polymer chains through the charge-transfer interaction,the fluorescence quenched properties of P varied obviously with the para-substituting group’s structure in the nitrobenzene derivatives.The fluorescence quenching efficiency of quenchers improved with increasing of electron repulsion capability of the para-substituting group.The fluorescence quenching efficiency increased nonlinearly with the concentration of the quenchers and had,however,no relation with the quenching time.
