Control of Chiroptical Property of 5helicene Derivative Based on Expansion of Chiral Space and Controlling Electronic Transitions

摘要

Helicenes have been attracting attention because of their chiroptical properties derived from the helical molecular structure. However, circularly polarized luminescence (CPL) of unsubstituted helicenes are weak due to its low fluorescence quantum yield (?f ≤ 0.04) and small CPL dissymmetry factor (gCPL). In this work, we introduced phenyl group into the edge of [5]helicene to expand π-conjugation with helical chirality.