Enhancing the Circularly Polarized Luminescence of Self‐assembled Cyanostilbenes through Extended π‐Conjugation

Abstract

Main observation and conclusionChiral supramolecular assembly of π‐conjugated luminophores provides a promising avenue for enhancing circularly polarized luminescence. In this study, we shed light on the impact of π‐conjugation length on circularly polarized luminescent performance of the resulting supramolecular assemblies, by designing a tetra‐cyanostilbene monomeric compound alongside two dicyanostilbene control compounds. These cyanostilbene‐based compounds possess the ability to form chiral supramolecular polymers in toluene, driven by a synergistic combination of intermolecular hydrogen bonding and π–π stacking interactions. The extended π‐aromatic skeleton brings bathochromic‐shifted fluorescence and enhanced intermolecular stacking capability for the tetra‐cyanostilbene compound. Consequently, chiral supramolecular assemblies formed by the tetra‐cyanostilbene compound demonstrate a remarkable two‐fold increase in glum values relative to the assemblies formed by the dicyanostilbene compounds. Overall, this study provides valuable insights into the relationship between π‐conjugation length and the circularly polarized luminescent performance of π‐conjugated supramolecular assemblies.This article is protected by copyright. All rights reserved.

Achieving Circularly Polarized Phosphorescence through Noncovalent Clipping of Metallotweezers

“…Circularly polarized phosphorescent (CPP) materials have garnered significant attention due to their combination of long-lived luminescence and chirality characteristics. , Although crystallizing chiral phosphors represents a plausible strategy for constructing CPP materials, it fails to produce circularly polarized phosphorescence in the solution state due to the phosphorescent quenching of dissolved oxygen and free molecular motions in solution. Host – guest complexation presents an alternative approach to tackle this issue and provides solution-processable CPP materials .…”

Stimuli-Triggered Dynamic Transformations in Supramolecular Polymers

“…Supramolecular polymers consist of polymeric arrays of monomer units held together by highly directional noncovalent bonds. − Since Lehn’s pioneering work in 1990, significant efforts have been directed toward constructing various types of supramolecular polymers, driven by multiple hydrogen bonds, − host–guest complexation, − metal–ligand coordination, , and π–π stacking interactions. − The reversibility and dynamic nature of these noncovalent interactions endow supramolecular polymers with stimuli-responsiveness, holding promising prospects in applications such as self-healing, shape-memory, and recyclable materials. − External stimuli can dynamically transform supramolecular polymers in several ways, including (i) triggering the depolymerization of supramolecular polymers into monomeric species, (ii) inducing transformations between different types of supramolecular polymers, (iii) activating a “dormant” monomer, leading to in situ supramolecular polymerization, and (iv) enabling time-programmable supramolecular polymerization. To further advance the field and promote the applications of stimuli-responsive supramolecular materials, fundamental research in supramolecular polymer chemistry should focus on three key aspects: (i) designing novel types of stimuli-responsive supramolecular polymers, (ii) understanding the interplay and cooperativity of various noncovalent interactions at the molecular level, which govern self-organization and adaptivity of stimuli-responsive supramolecular polymers, and (iii) investigating the dynamics of conversion under external stimuli.…”