We report the chiroptical properties of enantiopure 2.2fluorenonophane measured using electronic circular dichroism and circularly polarized luminescence spectroscopy. The target compound exhibited excellent chiroptical properties with high dissymmetry factors of gabs = ±1.3 × 10-2 and glum = +2.5 × 10-2/-2.6 × 10-2 in a wide range of solvents, accompanied by strong indications of excimer formation. This study emphasizes the outstanding role of 2.2paracyclophanes as model systems for small molecules with relatively large CPL and expands this compound class by using the easily accessible and modifiable fluorenone derivative.
Loleit et al. (Thu,) studied this question.