A poly ( p-phenylenevinylene ) ( PPV ) alternating copolymer, poly [ ( 2, 5-diphenylene-1, 3, 4-oxadiazole )-4-4' - vinylene-alt-2-methoxy-5-( 2-ethylhexyloxy )-1, 4-phenylenevinylene] (oxa-MEHPV), is synth...A poly ( p-phenylenevinylene ) ( PPV ) alternating copolymer, poly [ ( 2, 5-diphenylene-1, 3, 4-oxadiazole )-4-4' - vinylene-alt-2-methoxy-5-( 2-ethylhexyloxy )-1, 4-phenylenevinylene] (oxa-MEHPV), is synthesized by Heck coupling reaction and characterized with UV-vis, Fourier transform infrared ( FT-IR ), ^1H-NMR and photoluminescence ( PL ) spectroscopy, oxa-MEHPV possesses an outstanding thermal stability and shows excellent solubility in common organic solvents such as dichloromethane, chloroform, toluene, and tetrahydrofuran(THF). The introduction of the electron-deficient 1, 3, 4-oxadiazole units into the MEH-PPV backbone also increases the electron affinities of the conjugated segment, which leads to the blue-shift of the maximum absorption wavelength and makes the polymer have a high optical band-gap energy, good electron-transporting stability and high PL quantum yield.展开更多
基金The National Basic Research Program of China(973Program)(No.2007CB936300)the High Technology Research and Devel-opment Program of Jiangsu Province(No.BG2006033).
文摘A poly ( p-phenylenevinylene ) ( PPV ) alternating copolymer, poly [ ( 2, 5-diphenylene-1, 3, 4-oxadiazole )-4-4' - vinylene-alt-2-methoxy-5-( 2-ethylhexyloxy )-1, 4-phenylenevinylene] (oxa-MEHPV), is synthesized by Heck coupling reaction and characterized with UV-vis, Fourier transform infrared ( FT-IR ), ^1H-NMR and photoluminescence ( PL ) spectroscopy, oxa-MEHPV possesses an outstanding thermal stability and shows excellent solubility in common organic solvents such as dichloromethane, chloroform, toluene, and tetrahydrofuran(THF). The introduction of the electron-deficient 1, 3, 4-oxadiazole units into the MEH-PPV backbone also increases the electron affinities of the conjugated segment, which leads to the blue-shift of the maximum absorption wavelength and makes the polymer have a high optical band-gap energy, good electron-transporting stability and high PL quantum yield.