Circularly polarized luminescent systems fabricated by Tröger's base derivatives through two different strategies

The Tröger's base derivative rac-TBPP was synthesized and separated into two enantiomers R(2N)-TBPP and S(2N)-TBPP by chiral column chromatography. These compounds show a strong circularly polarized luminescence with g(lum) values of +0.0021, and −0.0025, respectively. The second way to fabricate the rac-TBPP-based CPL-active material is to co-gel the fluorescent rac-TBPP with a chiral ᴅ-glutamic acid gelator DGG by co-assembly strategy. At the molar ratio of rac-TBPP/DGG = 1:80, the g(lum) value of the co-gel was about three times higher than the g(lum) values of R(2N)-TBPP and S(2N)-TBPP enantiomers. Interestingly, the CPL handedness of the rac-TBPP/DGG co-gel could be adjusted effectively by changing their stoichiometric ratios.