Xiang Luo,Yuqing Yang,Mingdi Yang,Kehua Zhang,Yuxi Xian,Ping Wang,Hongliang Xu,Xianhai Hu
Polymer-based transition metal complexes have attracted much attention in many fields of application. In this article, a fluorescent polymer-based transition metal complex was prepared by bonding the transition metal complex with the polymer. First, Schiff base salicylaldehyde ethanolamine (HL) as a ligand was prepared by the reaction of salicylaldehyde with ethanolamine. Then, salicylaldehyde glycolamine Zn( ii ) transition metal complexes (ZnL 2 ) were synthesized with HL and Zn 2+ as the central ion. Finally, a blue fluorescent waterborne-based polyurethane Zn( ii ) complex (ZnL 2 -WPU) with an antibacterial function was prepared with ZnL 2 as a chain extender by modified acetone method. The characteristics of fluorescence, heat stability, and bacteriostasis were characterized. Compared with ZnL 2 , the UV–vis absorption peak of ZnL 2 -WPU shows a blue shift of about 20 nm. ZnL 2 -WPU has a strong blue fluorescence emission at 450 nm, and the intensity increases significantly with ZnL 2 content. Surprisingly, the fluorescence lifetime of ZnL 2 -WPU is obviously increased, reaching more than one time that of ZnL 2 . Interestingly, the antibacterial efficiency of ZnL 2 -WPU against E. coli reached an incredible 99%. More importantly, ZnL 2 -WPU uses water as the dispersing medium, which is more environmentally friendly.
In recent years, fluorescence sensors have been widely used in explosive detection due to their portability and high efficiency. In the present work, two K-region tetrasubstituted deep-blue pyrene-based luminogens were designed and synthesized by introducing electron-donating groups. The optical properties were investigated by experimental and density functional theory (DFT) methods. Reasonable luminescence efficiency and electron rich characteristic allowed for the possible detection of nitro-explosives. Both luminogens, especially TFPy , exhibit a sensitive response towards nitroanilines ( NA ), with a limit of detection (LOD) for p -NA as low as 2.75 × 10 –8 M, which is mainly attributed to the electron-donating substituents on the periphery of the pyrene core and the extended π-conjugated structure. These research results establish a low-cost and simple strategy for the detection of trace nitroaniline.
Zhiheng Zhang,Hongchen Chen,Weize Diao,Chuangxin Zhou,Guozhen Liu
Eutectic gallium indium (EGaIn) nanoparticles can be modified with aniline derivatives to introduce versatile functional groups toward bioapplications beyond materials science. The p-aminobenzoic acid (PABA) modified EGaIn (EGaIn-PABA) demonstrated high wettability with the presence of carboxyl groups, but the priority of carboxyl and amino groups binding on EGaIn surface remains unclear. To study the binding nature of PABA to EGaIn, the anti-mouse IgG antibody labeled with fluorescein isothiocyanate (FITC) (IgG-FITC) was covalently modified to EGaIn-PABA to verify the presence of terminal carboxyl groups on EGaIn surface. The binding of gold nanoparticles (AuNPs) to EGaIn-PABA nanoparticles suggested the presence of terminal amino groups on EGaIn surface. Then, taking advantage of the reductive nature of amino groups, the Almar blue fluorescence experiment was designed to determine the co-existence of carboxyl and amino groups on the EGaIn-PABA surface with the approximate ratio of 3:7, suggesting carboxyl groups had a higher probability of binding with the EGaIn surface than that of amino groups. Then, an aptasensor was fabricated on the EGaIn-PABA surface with AuNPs for electrochemical detection of interleukin-6 with a sensitivity of 1 pg/mL.
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