Delgado I Hernández, Pascal S, Wallabregue A, Duwald R, Besnard C, Guénée L, Nançoz C, Vauthey E, Tovar R C, Lunkley J L, Muller G, Lacour J
Department of Organic Chemistry , University of Geneva , Quai Ernest Ansermet 30 , CH-1211 Geneva 4 , Switzerland.
Laboratory of Crystallography , University of Geneva , Quai Ernest Ansermet 24 , CH-1211 Geneva 4 , Switzerland.
Chem Sci. 2016 Jul 1;7(7):4685-4693. doi: 10.1039/c6sc00614k. Epub 2016 Apr 8.
Unprecedented regioselective post-functionalization of racemic and enantiopure cationic diaza [4]helicenes is afforded. The peripheral auxochrome substituents allow a general tuning of the electrochemical, photophysical and chiroptical properties of the helical dyes (26 examples). For instance, electronic absorption and circular dichroism are modulated from the orange to near-infrared spectral range (575-750 nm), fluorescence quantum efficiency is enhanced up to 0.55 (631 nm) and circularly polarized luminescence is recorded in the red (|| ∼ 10).
实现了外消旋和对映体纯的阳离子二氮杂[4]螺旋烯前所未有的区域选择性后官能化。外围助色团取代基能够对螺旋染料的电化学、光物理和手性光学性质进行一般调节（26个实例）。例如，电子吸收和圆二色性在从橙色到近红外光谱范围（575 - 750 nm）内得到调制，荧光量子效率提高到0.55（631 nm），并且在红色区域记录到圆偏振发光（|| ∼ 10）。
