Chiral exciplex dyes showing circularly polarized luminescence: Extension of the excimer chirality rule

Kazuto Takaishi, Sho Murakami, Kazuhiro Iwachido, Tadashi Ema

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

A series of axially chiral binaphthyls and quaternaphthyls possessing two kinds of aromatic fluorophores, such as pyrenyl, perylenyl, and 4-(dimethylamino)phenyl groups, arranged alternately were synthesized by a divergent method. In the excited state, the fluorophores selectively formed a unidirectionally twisted exciplex (excited heterodimer) by a cumulative steric effect and exhibited circularly polarized luminescence (CPL). They are the first examples of a monomolecular exciplex CPL dye. This versatile method for producing exciplex CPL dyes also improved fluorescence intensity, and the CPL properties were not very sensitive to the solvent or to the temperature owing to the conformationally rigid exciplex. This systematic study allowed us to confirm that the excimer chirality rule can be applied to the exciplex dyes: left- and right-handed exciplexes with a twist angle of less than 90° exhibit (-)- and (+)-CPL, respectively. This journal is

Original languageEnglish
Pages (from-to)14570-14576
Number of pages7
JournalChemical Science
Volume12
Issue number43
DOIs
Publication statusPublished - Nov 21 2021

ASJC Scopus subject areas

  • Chemistry(all)

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