Kazuto Takaishi, Yoshihiro Satō, Tadashi Ema
Multibridged azapyrenophanes were synthesized as organic circularly polarized luminescence (CPL) emitters. The g lum reached +0.12 and the B CPL amounted to 2,600 M –1 cm –1 at −95 °C. The xylylene-bridging to the binaphthyl-bridged pyrenophane produced a quadruply bridged structure that prompted the pyrene excimer to adopt a D 2 -symmetric rigid conformation. This strategy maximized the latent CPL performance. Furthermore, these emitters functioned as temperature- and acid/base-triggered (+)/(−)- or on/off-CPL switches in which enantiospecific responses toward chiral solvents were also observed.