Circularly Polarized Luminescence Switching Driven by Precisely Tuned Supramolecular Interactions: From Hydrogen Bonding to - Interaction

It is highly challenging to achievecircularly polarized luminescence(CPL) switching by precisely tuning supramolecular interactions andunveiling the mechanism of supramolecular chirality inversion. Herein,we demonstrated CPL switching based on diethyl l-glutamate-9-cyanophenanthrene(LGCP) and diethyl l-glutamate-pyrene (LGP) via the preciseregulation of supramolecular interactions. LGCP assembly driven byhydrogen bonding showed right CPL, while LGP assembly driven by & pi;-& pi;interaction led to left CPL. Remarkably, significant CPL switchingwas observed from the assemblies of LGCP/octafluoronaphthalene (OFN),attributed to the alteration of the dominating interaction from weakhydrogen bonding to rather strong & pi;-& pi; interaction,while the assemblies of LGP/OFN exhibited minimum CPL variation becausethe dominating & pi;-& pi; interaction within the assemblyof LGP/OFN illustrated quite limited variations upon arene-perfluoroareneinteraction. This work provides a feasible strategy toward the efficientmodulation of the chiroptical properties of multiple component supramolecularsystems, meanwhile offering possibilities for the mechanism explorationof the chirality inversion of supramolecular assemblies.