Photophysical and electrochemical properties of π-extended molecular 2,1,3-benzothiadiazoles
作者:Brenno A. DaSilveira Neto、Aline Sant'Ana Lopes、Gunter Ebeling、Reinaldo S. Gonçalves、Valentim E.U. Costa、Frank H. Quina、Jairton Dupont
DOI:10.1016/j.tet.2005.08.093
日期:2005.11
adequate band gap values for testing as OLEDs. The 4,7-disubstituted-2,1,3-benzothiadiazoles 4a–e and 7a–e exhibit different electrochemical behavior. The presence of two ethynyl spacers in 2,1,3-benzothiadiazoles 7a–e shifts the reduction potentials to less cathodic values and also results in two well-defined and distinct reduction processes.
4,7-二溴-2,1,3-苯并噻二唑与芳基硼酸(苯基,1-萘基,4-甲氧基苯基,4-氯苯基和4-三氟甲基苯基)在催化量的NCP-夹钳式金枪鱼环的存在下反应能够以高收率获得光致发光的π扩展4,7-二芳基-2,1,3-苯并噻二唑4a – e。这些4,7-二芳基-2,1,3-苯并噻二唑具有高荧光量子产率,高电子亲和力和足够的带隙值,可作为OLED进行测试。由于存在两种阻转异构体,因此4,7-双萘-2,1,3-苯并噻二唑4b具有两个不同的寿命(双指数衰减)。4,7-二乙炔基-2,1,3-苯并噻二唑6的Sonogashira偶联反应与相应的卤代芳基化合物(碘代苯,1-溴代萘,4-碘代苯甲醚,4-溴代N,N-二甲基苯胺和2-溴代吡啶)提供光致发光的π扩展的4,7-双-炔基芳基-2,1, 3-苯并噻二唑7a - e,也高产。这些4,7-二乙炔基-2,1,3-苯并噻二唑也具有较高的荧光量子产率,较高的电子