Synthesis, photophysics and molecular structures of luminescent 2,5-bis(phenylethynyl)thiophenes (BPETs)
作者:Jamie S. Siddle、Richard M. Ward、Jonathan C. Collings、Simon R. Rutter、Laurent Porrès、Lucas Applegarth、Andrew Beeby、Andrei S. Batsanov、Amber L. Thompson、Judith A. K. Howard、Abdou Boucekkine、Karine Costuas、Jean-François Halet、Todd B. Marder
DOI:10.1039/b701172e
日期:——
The spectroscopic studies of 1a–h and 2 show that both electron donating and electron withdrawing para-subsituents on the phenyl rings shift the absorption and emission maxima to lower energies, but that acceptors are more efficient in this regard. The short singlet lifetimes and modest fluorescence quantum yields (ca. 0.2–0.3) observed are characteristic of rapid intersystem crossing. The single-crystal
两个当量对位乙炔基苯的Sonogashira交叉偶联与2,5-二碘噻吩为制备2,5-双(对-R-苯基乙炔基)噻吩(R = H,Me,OMe,CF 3,NMe 2,NO 2,CN和CO 2 Me)提供了简单的合成途径(1a – h)。同样地,2,5-双(五氟苯基乙炔基)噻吩(2)是通过耦合制备的。2,5-二碘噻吩 和 五氟苯基乙炔。所有化合物均通过NMR,IR,拉曼光谱和质谱,元素分析进行表征,并测量了它们的吸收和发射光谱,量子产率和寿命。1a - h和2的光谱研究表明,苯环上的给电子和吸电子对位取代基都将吸收和发射最大值转移到较低的能量,但是受体在这方面更有效。观察到的短单峰寿命和适度的荧光量子产率(约0.2-0.3)是系统间快速杂交的特征。2,5-双(苯基乙炔基)噻吩,2,5-双(对位)的单晶结构-碳甲氧基苯基乙炔基)噻吩,2,5-双(对甲基苯基乙炔基)噻吩和2,5-双(五氟苯基乙炔基)噻吩通过X射线衍射在120