Lanthanide(III)‐Based Multicolor Luminescent Hybrid Gel for Amine Sensing

Abstract

Bridged polysilsesquioxanes (BPs) show great potential in the development of lanthanide-based luminescent materials, owing to their capacity to loading lanthanide complexes with high concentration and their flexible processability. A novel BP precursor, consisting of a C -symmetrical benzene central core moiety, capable of sensitizing the luminescence of Eu and Tb is reported. Tunable, full-color luminescent gels were facilely prepared by mixing the as-synthesized precursor and Ln ions in appropriate solvents. By either changing the Eu /Tb molar ratio or altering the excitation wavelength, the emission colors of the final gels can be finely tuned. Additionally, the yellow-colored emissive gel with a molar ratio of Eu to Tb of 0.5 can be used as an effective ratiometric luminescent sensor for distinguishing amines with lower pK (<5) from those with higher pK (>9).

An Encyclopedic Compendium on Chemosensing Supramolecular Metal‐Organic Gels

“…[170] Amines: Bridged polysilsesquioxanes (BPs) effectively incorporated lanthanide complexes at high concentrations, making them promising for lanthanide-based luminous materials (Figure 5C). The precursor L2 boosted Eu(III) and Tb(III) luminescence [171] and combining the precursor with Ln(III) ions produced adjustable, full-color brilliant gels easily. By changing the Eu(III)/Tb(III) molar ratio or excitation wavelength, the resultant gels' emission colors may be accurately changed.…”

Latest advances in sensors for optical detection of relevant amines: insights into lanthanide-based sensors

“…58 The same group of researchers also reported other systems with potential for amine vapours sensing. 65,74 In one of these works, preparation of Eu 3+ complexes into a layered zirconium phosphate was performed. 65 However, a poor resolution was obtained.…”

“…10). 74 Bridged polysilsesquioxanes, consisting of benzene central cores linked by a silica-based network obtained by aminopropyltriethoxysilane precursor, could sensitize the luminescence of Eu 3+ and Tb 3+ . The colour changes result from electron transfer from the electron-rich organic amines to the p-electron-deficient polysilsesquioxanes.…”

Selective Recognition of Fe(III) in Aqueous Environment over Covalently‐Bonded Tb‐Complex‐Containing Fluorescent Porous Copolymer Microspheres

“…Unfortunately, most of the reported Ln‐complexes are unstable and sensitive to outside species due to the complexes can be easily disturbed by competing ligands, metal ions, acidic, or alkaline substances. A prevalent solution is incorporating Ln‐complexes into organic framework, polymers, inorganic, or hybrid matrices . Polymer microspheres are cost‐effective, easily available, and have convenient functionalization, which can provide hydrophobic environment to protect the Ln‐complexes from being disturbed by outside species.…”