Functionalized cationic [4]helicenes with unique tuning of absorption, fluorescence and chiroptical properties up to the far-red range
Chemical Science2016Vol. 7(7), pp. 4685–4693
Citations Over TimeTop 10% of 2016 papers
I. Hernández Delgado, Simon Pascal, Antoine Wallabrègue, Romain Duwald, Céline Besnard, Laure Guénée, C. Nançoz, Eric Vauthey, R. C. Tovar, Jamie L. Lunkley, Gilles Muller, Jérôme Lacour
Abstract
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 (|glum| ∼ 10-3).
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