A series of four donor aryl alkynyl substituted thiazole derivatives 3a–d and three similar aryl donor–acceptor systems 6a–c have been synthesized. All compounds bear different electron-donating groups in the 5-position of the thiazole core. The influence of both electron donor strength and the additional phenylethynyl unit on photophysical properties, i.e. UV/Vis absorption, fluorescence emission and fluorescence lifetime, has been evaluated. Additionally, theoretical calculations have been performed at the CAM-B3LYP/6-31+G(d,p) level and good agreement with the experimental data has been achieved. The new derivatives synthesized via palladium catalyzed cross coupling are characterised by moderately strong emission between 474 and 538 nm (ΦF = 0.35–0.39) and Stokes’ shifts ranging from 0.54 to 0.79 eV (4392–6351 cm−1). The smaller chromophores of type 6 exhibit modest to high fluorescence emission (ΦF = 0.45–0.76) between 470 and 529 nm and their Stokes’ shifts range from 0.59 to 0.65 eV (4765–5251 cm−1).
已经合成了四种供体芳基
乙炔基取代的
噻唑衍
生物3a-d和三种类似的供体-受体体系6a-c。所有化合物均在
噻唑核心的5-位上带有不同的电子供体基团。评估了电子供体强度和附加的
苯乙炔单元对光物理性质(即UV/Vis吸收、荧光发射和荧光寿命)的影响。此外,在CAM-B3LYP/6-31+G(d,p)
水平进行了理论计算,得到了与实验数据良好的吻合。通过
钯催化的交叉耦合合成的新衍
生物具有中等强度的发射(474至538 nm,ΦF = 0.35-0.39)和斯托克斯位移从0.54至0.79 eV(4392-6351 cm−1)。类型6的较小色团显示出适度的至高荧光发射(ΦF = 0.45-0.76),在470至529 nm之间,其斯托克斯位移范围从0.59至0.65 eV(4765-5251 cm−1)。