Non-classical Circularly Polarized Luminescence (CPL) Control based on Precise Chiral Space Control

Abstract

Recently, the development of optically active luminophores that can emit circularly polar ized luminescence (CPL) with high functionalities, such as a high dissymmetry factor (g_CPL) and a high quantum yield (Φ_F), has attracted attention in the field of chiroptical materials. Generally, enantiopair of luminophores with a stereogenic centre(s) provide mirror-image CPL signals with (+)- and (–)-signs. Upon combining chiral peptides and fluorescent pyrene moieties, chiral oligopeptides bearing pendant pyrenyl units exhibit CPL originating from intramolecular pyrene excimers, and the sign of their CPL signals can be controlled by the distance between the pendant pyrenes and the type of solvent em ployed.