Water-soluble Tb³⁺ and Eu³⁺ complexes based on task-specific ionic liquid ligands and their application in luminescent poly(vinyl alcohol) films

Abstract

Novel water-soluble lanthanide complexes (Ln(IMI-DPA)3) have been synthesized using the task-specific ionic liquid consisting of a dipicolinic acid motif as the sensitizer of lanthanide luminescence. In Ln(IMI-DPA)3, Ln(3+) ions are in 9-fold coordination through six carboxylate oxygen atoms and three nitrogen atoms in pyridine units, and the water molecule is excluded from the coordination sphere of the lanthanides. It is found that Ln(IMI-DPA)3 possess bright luminescence, long luminescence lifetime in aqueous solution, high thermal stability and good water solubility. Furthermore, these complexes can be incorporated into water-soluble poly(vinyl alcohol) (PVA) matrixes to obtain highly luminescent, transparent and flexible PVA composite films. The emission colors of the films can be tuned from red, orange, yellow, light green, green to white light by regulating the concentration of the various luminescent components.

Hybridization of CsPbBr3 Perovskite Nanocrystals with Polymer Nanofiber to Improve their Luminescence Stability

“…The luminescence lifetime was measured by using a 2 W laser (360 nm) as the excitation source. Quantum yields were determined by using an integrating sphere whose inner face was coated with BenFlect from FLS920P Edinburgh spectrofluorometer …”

Two Novel Binuclear Lanthanide Complexes with 2,5‐Dichlorobenzoic Acid and 5,5’‐Dimethyl‐2,2’‐bipyridine: Crystal Structures, Luminescence and Thermal Properties

“…Figure (a) shows the excitation spectra of complex 2 (Tb 3+ ion), which was recorded by monitoring the emission of Tb 3+ ion at 545 nm. The excitation maximum peak 328 nm dominates the whole excitation spectra of complex 2 , which is attributed to the typical π‐π* electronic transition of the organic ligand . The emission spectra of complex 2 shows four characteristic emission peaks of the Tb 3+ ion at 490, 546, 584, 622 nm.…”

Smart Stimulation Response of a Pyrene-Based Lanthanide(III) MOF: Fluorescence Enhancement to HX (F and Cl) or R-COOH and Artificial Applicable Film on HCl Vapor Sensing

“…In the ATR-IR spectrum (Figure 11a), 1-HCl showed the carboxylate asymmetric stretching (νnd as COO − ) vibration peak at 1683 cm −1 , the same as to H 4 TBAPy, and had a distinct blue shift compared with that of complex 1 (1659 cm −1 ), which inferred that complex 1 was dissociated into free H 4 TBAPy ligand and Pr 3+ ion by HCl vapors. 63 The −OH vibration peak of 1-HCl at 3340 cm −1 was wider than that of complex 1 (3368 cm −1 ), indicating that −OH is protonated to H 3 O + . However, the vibrational peaks of the carboxyl of 1-HCl-TEA were the same as that of complex 1, suggesting that carboxyl was deprotonated, and the carboxyl of ligand TBAPy coordinated with Pr 3+ .…”