Journal
CHEMICAL COMMUNICATIONS
Volume 53, Issue 47, Pages 6323-6326Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cc01351e
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Funding
- JSPS KAKENHI grant [15K05489, 15K17441]
- MEXT-Supported Program for the Strategic Research Foundation at Private Universities
- Grants-in-Aid for Scientific Research [15K17441] Funding Source: KAKEN
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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 diamine 1, 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 (broken vertical bar g(em)broken vertical bar = similar to 3-4 x 10(-3)) contribution from the minor excimer component, which should exhibit an efficient chiral environment around the dimeric pyrenes.
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