The chiroptical performance of the molecules showed a direct relationship with their aggregation behaviors. The chiral center system always exhibited aggregation-induced circular dichroism (AICD) effect and the chirality was transferred from the chiral center to the molecular backbone upon aggregation. While the axial-chiral system showed opposite aggregation-annihilated circular dichroism (AACD) effect and it was related with the conformational change during the process of aggregation. In addition, achiral molecules could aggregate to generate strong and unique chiroptical signals and it was likely because a dominant handedness was formed upon aggregation.

Read more: 1). Liq. Cryst. XXII, 2018, 107350H. ; 2) Chem. Asian J. 2019, 14, 674.