pH-influenced handedness inversion of circularly polarized luminescence†
Abstract
Circularly polarized luminescence (CPL) inversion in supramolecular nano-assemblies remains attractive due to the unique applications in chiroptical switches, chiral recognition, and smart materials. Herein, the co-assembly behaviour of a pair of tolane substituted Phe–Phe dipeptides with 1,2-diaminoethane at different pH values has been investigated. Handedness inversion of CPL was detected for the co-assemblies by changing pH values. It was demonstrated that the chirality-induced twist conformation of the tolane moiety in dipeptides was responsible for the CPL inversion. The co-assembling strategy by combining luminescent dipeptides and organic amines at different pH values could be a promising approach for designing and preparing CPL-active nanomaterials, and readily tuning chiroptical properties.
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