Functionalized cationic [4]helicenes with unique tuning of absorption, fluorescence and chiroptical properties up to the far-red range
2016; Royal Society of Chemistry; Volume: 7; Issue: 7 Linguagem: Inglês
10.1039/c6sc00614k
ISSN2041-6539
AutoresI. Hernández Delgado, Simon Pascal, Antoine Wallabregue, Romain Duwald, Céline Besnard, Laure Guénée, C. Nançoz, Eric Vauthey, R. C. Tovar, Jamie L. Lunkley, Gilles Muller, Jérôme Lacour,
Tópico(s)Luminescence and Fluorescent Materials
ResumoUnprecedented 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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