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Relevant academic research and scientific papers

Yellow emitting materials: Truxene-based conjugated hyperbranched polymer containing difluoroboron-diketonate complexes

A series of novel hyperbranched polymers BF2-HP(1–4) containing difluoroboron-diketonate complexes and truxene units have been synthesized. To achieve the target polymers, the precursors Boc-HP(1–4) were obtained through the Pd (0)-catalyzed Suzuki polymerization with an “A2 + B3” or “A2 + B2 + B3” approach in different molar ratios. After the deprotection of Boc-groups, the reaction with BF3 gave the polymers BF2-HP(1–4). The new BF2 containing polymers exhibited red-shifts in their UV–vis absorption and emission compared with their uncomplexed counterparts. The tunable hyperbranched architectures of BF2-HP(1–4) resulted in diverse optical properties. With the decrease of linear units in BF2-HP(1–4), the emission peaks in chloroform solution presented a significant blue-shift, whereas a red-shift was noted in films. Notably, the hyperbranched architectures could suppress the aggregation more effectively than the linear architectures not only in poor solvents such as DMF but also in the film states. In addition, these polymers showed high thermal stability, and good solubility in common organic solvents.

Improved AIE-Active Probe with High Sensitivity for Accurate Uranyl Ion Monitoring in the Wild Using Portable Electrochemiluminescence System for Environmental Applications

The development of highly sensitive and selective uranyl ion (UO22+) probes has attracted significant attention owing to the threat to human health caused by high toxicity, radioactivity, and long half-life. Herein, the development of aggregation-induced emission (AIE) active polymer dots (Pdots) is described for an accurate UO22+ monitoring using a portable electrochemiluminescence (ECL) system. An AIE-active polymer containing tetraphenylethene and boron ketoiminate moieties is prepared into Pdots and modified with ssDNA to capture UO22+, which can amplify the ECL signal of the Pdots through a resonance energy transfer mechanism. This probe provides an ultralow detection limit of 10.6 pm/2.5 ppt, which is at least two orders of magnitude lower than the known UO22+ luminescent probes. Only UO22+ can provide an obvious ECL enhancement among the various metal ions, indicating the excellent selectivity of this probe. Furthermore, a portable ECL analyzer is designed to realize UO22+ measurements in the wild. The anodic ECL mechanism of UO22+ is discovered and ECL technology is first applied in monitoring radioactive substances. This study provides a novel strategy for the development of accurate UO22+ probes and a practical UO22+ monitoring method, indicating its potential application in the environmental and energy fields.

Theoretical and Experimental Study on Boron β-Diketonate Complexes with Intense Two-Photon-Induced Fluorescence in Solution and in the Solid State

Three boron diketonate chromophores with extended π-conjugated backbone were prepared and their spectroscopic features were investigated through a combined theoretical/experimental study. It was shown that these complexes, which undergo very large electro

Chiral sensing for induced circularly polarized luminescence using an Eu(iii)-containing polymer and d- or l-proline

An Eu(iii)-containing polymer can exhibit intense induced circularly polarized luminescence (CPL) in the presence of proline. In addition, the optical anisotropy factor (glum) of the polymer for 5D0 → 7F1/7F 2 transition was much higher than that of a single model molecule, which reveals the amplification effect of CPL arising from the conjugated polymer structure.