Kazuki Nakabayashi

Can chiral P(III) coordinate Eu(III)? Unexpected solvent dependent circularly polarised luminescence of BINAP and Eu(III)(hfa)3 in chloroform and acetone

The coordination of Eu(III) (from Eu(III)(hfa)3) by chiral P(III) (from BINAP) led to circularly polarised luminescence in dilute solutions on the order of |gem| ≈ 10−2 at 5D0 → 7F1 and |gem| ≈ 10−3 at 5D0 → 7F2 transitions regardless of the coordinating ability of the solvent (i.e., in non-coordinating ethanol-free chloroform and coordinating acetone).

Circularly polarized luminescence of biaryl atropisomers: subtle but significant structural dependency

The signs of circularly polarised luminescence and circular dichroism of chiral biaryl fluorophores in the CHCl3-dissolved state (solution state) and the PMMA-film-dispersed state (solid state) were successfully controlled by modifying the internal axial chirality and the axial bonding position of the biaryl units.

Cryptochiral binaphthyl–bipyrene luminophores linked with alkylene esters: intense circularly polarised luminescence, but ultraweak circular dichroism

A C2-symmetric binaphthyl-based luminophore connected to two luminescent pyrene pendants was designed to express cryptochirality, as demonstrated by the ultraweak circular dichroism signals observed in their ground state. The observed results were due to the unrestricted rotational freedom of the flexible ester wires between the binaphthyl and pyrene moieties in the absence of light. Finally, the C2-symmetric luminophore revealed photoexcited chirality, as confirmed by intense circularly polarised luminescence.

Photoexcited state chirality transfer. Hidden tunability of circularly polarized luminescent binaphthyl–anthracene tandem molecular systems

Circularly polarized luminescent properties of C2-symmetrical binaphthyl molecular systems bearing two achiral anthracenes as luminophores were tuned by solely exploiting photoexcited-state chirality transfer from the binaphthyl to anthracenes when open- or closed-type binaphthyl structure as non-luminophore were chosen.