Concentration-dependent circularly polarized luminescence (CPL) of chiral N, N′-dipyrenyldiamines: sign-inverted CPL switching between monomer and excimer regions under retention of the monomer emission for photoluminescence. Issue 47 (12th May 2017)

• Record Type: Journal Article
• Authors: Ito, Suguru; Ikeda, Kengo; Nakanishi, Shoma; Imai, Yoshitane; Asami, Masatoshi
• Is Part Of: Chemical communications. Volume 53:Issue 47(2017)
• Page Start: 6323
• Page End: 6326
• Publication Date: 2017-05-12
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1039/c7cc01351e
• Languages: English
• ISSNs: 1359-7345

Abstract

Abstract : The CPL of a chiral diamine can be switched between two regions under concomitant inversion of the handedness, while a strong PL intensity is maintained in the same region. Abstract : Herein, an unprecedented switching of circularly polarized luminescence (CPL) is described for chiral 4, 6-bis(1-(pyren-1-ylamino)propyl)dibenzo[ b, d ]furan (1 ). The CPL band of chiral diamine1, which contains two pyrene rings, can be switched between the monomer and excimer emission regions under concomitant inversion of the handedness, simply by changing the concentration of the fluorophore. In contrast, the maximum photoluminescence (PL) intensity is always observed in the monomer region, regardless of the concentration. The reversal of the intensity ratio of monomer and excimer emission between PL and CPL was attributed to a stronger CPL (| g em | = ∼3–4 × 10 −3 ) contribution from the minor excimer component, which should exhibit an efficient chiral environment around the dimeric pyrenes.