Lanthanide-Mediated Cyclodextrin-Based Supramolecular Assembly-Induced Emission Xerogel Films: A Transparent Multicolor Photoluminescent Material

Abstract

Supramolecular xerogel films as multicolor photoluminescent materials are ideal for applications in optical devices, such as photochromic smart windows and LEDs. Therefore, a blue-fluorescence supramolecular hydrogel has been successfully constructed from α-CD and benzimidazole derivatives (WCB) through host–guest interactions with supramolecular assembly-induced emission (SAIE) properties. The hydrogel WCB-α-CD enables the coordination with different lanthanide metal ions (Ms) to form supramolecular nanoparticles with spherical-like morphology, thus rendering the xerogel films for lanthanide luminescence. The xerogel films WCB-α-CD@Ms, with high luminous transmittance (T > 90%) and multicolor photoluminescence, exhibit a promising potential for smart optical film materials utilizing supramolecular assembly.

A Pd2L4 Metallacage‐Cored Supramolecular Amphiphile and Its Application in Dual‐Responsive Controllable Release†

“…The value of SLB greater than 0.5 means that the liquid behavior dominates and less than 0.5 implies the solid behavior dominates. [ 66‐67 ] By comparison, the SLB value of the gel increased from 0.21 to 0.59 after adding γ ‐CD (Figure 2b), indicating the dominated effect of liquid behavior after supramolecular gel was destroyed. Based on the above results, we deduce that there was a host–guest interaction between γ ‐CD and the pyrene unit of 1 ·([BF 4 ] – ) 4 , which prevented the π–π stacking between pyrene molecules, and the gel collapsed after the supramolecular network was destroyed.…”

Pyridine-Dicarbohydrazone-Based Polyacrylate Hydrogels with Strong Mechanical Property, Tunable/Force-Induced Fluorescence, and Thermal/pH Stimuli Responsiveness

“…Lanthanide ions are usually regarded as prior metal ions to make fluorescent materials with different colors because of their excellent coordination abilities and fluorescence properties. 3,16,17 d−f transition enables intense metal-center luminescence, particularly when incorporated with sensitizing ligands in the first coordination sphere. 18−22 Based on that, Weng et al 23 have reported a multistimuli responsive fluorescent hydrogel controlled by the dynamic coordination of Eu 3+ -iminodiacetate.…”

“…Smart fluorescent materials, exhibiting tunable fluorescent properties, are a key branch of smart materials and have been intensively exploited over the last few decades. Developing a fluorochromic material equipped with multistimuli responsive behaviors has long been attracting increasing attention. , Meanwhile, combining the advantages of polymer hydrogels could make smart fluorescent materials soft and wet for applications in biosensors, probes, light-emitting devices, and information storage and confidentiality. − …”

“…However, the color change of fluorescence in hydrogel sensors for direct detection is more visible and obvious for naked-eye recognition. Lanthanide ions are usually regarded as prior metal ions to make fluorescent materials with different colors because of their excellent coordination abilities and fluorescence properties. ,, Among them, Eu with the d–f transition enables intense metal-center luminescence, particularly when incorporated with sensitizing ligands in the first coordination sphere. − Based on that, Weng et al have reported a multistimuli responsive fluorescent hydrogel controlled by the dynamic coordination of Eu 3+ -iminodiacetate. Also, Wang et al have prepared a red-emitting luminescent Eu 3+ -based gel with multistimuli responsiveness.…”

Efficient artificial light-harvesting systems with gel properties formed by ion recognition

“…Supramolecular gels are an interesting sort of soft material that display moderate flexibility, which readily allows them to change their shape and properties according to the external conditions, like heat, solvents, pH, light, cations/anions and oxidative/reductive reactions. 4 The key to gel formation is the self-assembly of the low molecular weight gels (LMWGs), interconnected via a variety non-covalent interactions, such as hydrogen bonding, van der Waals interactions, π–π forces, metal coordination and hydrophobic effects. 5 These excellent properties offered supramolecular gels extraordinary ability to act as smart materials, which has kept on attracting substantial research interest for promising application prospects in tissue engineering, microfluidic devices, chemosensors, drug delivery, optoelectric devices, smart films and biomaterials etc.…”