Tomoyuki Amako

Dependence of circularly polarized luminescence due to the neighboring effects of binaphthyl units with the same axial chirality

The solution-dissolved-state circular dichroism (CD) and the circularly polarized luminescence (CPL) of chiral binaphthyl fluorophores was controlled by both the axial chirality of the binaphthyl units as well as by the effect of neighboring binaphthyl units.

Solid-state circularly polarised luminescence and circular dichroism of viscous binaphthyl compounds

The chiroptical properties of two viscous chiral fluorophores, (R)-2,2′-hepthoxy-1,1′-binaphthyl [(R)-1] and its antipode [(S)-1], dispersed in inorganic (KBr and KCl) and organic polymer (PMMA and PS) matrices are studied in the photoexcited and ground states. Both (R)-1 and (S)-1 emit circularly polarised luminescence (CPL) with a high quantum efficiency in these solid matrices (15–58%) and in chloroform solution (14%).

Polymorphism of Supramolecular Charge-Transfer Complex Composed of 10,10′-dihydroxy-9,9′-biphenanthryl and p-benzoquinone

Charge-transfer (CT) complexes were prepared using racemic (rac)-10,10′-dihydroxy-9,9′-biphenanthryl, which has a large and highly π-conjugated phenanthrene ring, as the electron donor and p-benzoquinone as the electron acceptor. This CT system showed a polymorphism.