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Inter- and intramolecular excimer circularly polarised luminescence of planar chiral paracyclophane-pyrene luminophores.

ABSTRACT: Two types of planar chiral [2,2]paracyclophane-pyrene luminophores (1 and 2) with different binding positions of the fluorescent pyrene units were synthesised. (R)/(S)-1 with 1-pyrene units exhibited green intermolecular excimer circularly polarised luminescence (CPL) at 530 nm in the KBr-pellet, but exhibited no CPL signal in dilute CHCl₃ solution. In contrast, (R)/(S)-2 with 2-pyrene units exhibited a blue intramolecular excimer CPL at 450 nm in CHCl₃ solution. This is the first example of using the binding position of pyrene and the external environment to tune the type (inter- or intramolecular) and chiroptical sign of excimer CPL.

SUBMITTER: Hara N

PROVIDER: S-EPMC9050457 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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Inter- and intramolecular excimer circularly polarised luminescence of planar chiral paracyclophane-pyrene luminophores.

Hara Nobuyuki N Shizuma Motohiro M Harada Takunori T Imai Yoshitane Y

RSC advances 20200320 19

Two types of planar chiral [2,2]paracyclophane-pyrene luminophores (1 and 2) with different binding positions of the fluorescent pyrene units were synthesised. (R)/(S)-1 with 1-pyrene units exhibited green intermolecular excimer circularly polarised luminescence (CPL) at 530 nm in the KBr-pellet, but exhibited no CPL signal in dilute CHCl3 solution. In contrast, (R)/(S)-2 with 2-pyrene units exhibited a blue intramolecular excimer CPL at 450 nm in CHCl ...[more]

PMID: 35495310

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