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Metal organic frameworks composite Eu2O3@[Zn2(1,4-ndc)2dabco] synthesized by pulsed laser ablation in flowing liquid and its fluorescent sensing of fatty alcohol with different branch chains
摘要： This work reports the metal organic frameworks composite Eu2O3@[Zn2(1,4-ndc)2dabco] synthesized by pulsed laser ablation in flowing liquid. Powder X-ray Diffraction (PXRD) and SEM were used to characterize its structure and morphology. The results show that the Eu2O3 nanoparticles with the average particle size of 3.08 nm are uniformly distributed among the crystal and the BET specific surface area of the composite Eu2O3@[Zn2(1,4-ndc)2dabco] is 1087 m2/g. At 296 K, the adsorption capacities of C2H2 on composite are up to 117.3 cm3/g, which is larger than that of the compound [Zn2(1,4-ndc)2dabco]. The C2H6/CH4 selectivity of the composite Eu2O3@[Zn2(1,4-ndc)2dabco] is 25.9 and much higher than that of some familiar MOFs materials. Moreover, the composite Eu2O3@[Zn2(1,4-ndc)2dabco] can emit very intense characteristic fluorescence at 613 nm of Eu3t ion under ultraviolet radiation and can be used for detecting of fatty alcohols with different branch chains in fluorescence sensing because of its fluorescence intensity at 613 nm is sensitive to fatty alcohol with different carbon chains. The luminescence based sensing mechanism of the composite Eu2O3@[Zn2(1,4-ndc)2dabco] was discussed.
关键词： Flowing liquid,MOFs composites,Adsorption,Fatty alcohol with different branch chains,Pulsed laser ablation,Fluorescent sensing
更新于2025-09-23 15:19:57
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Off-on fluorescent switching of boron-doped carbon quantum dots for ultrasensitive sensing of catechol and glutathione
摘要： A signal-off-on probe of B-doped carbon quantum dot (B-CQD) is developed for ultrasensitive detection of catechol (CC) by fluorescence quenching and glutathione (GSH) by fluorescence recovering without any auxiliary of biomolecules or labeled materials. In this sensing system, the B-CQDs with a high quantum yield of 42% are prepared via a facile hydrothermal method with precursors of citric acid as C source and sodium tetraphenylborate as B source. The microstructure and fluorescence stability of the B-CQDs are investigated. Under the optimum conditions, the B-CQDs are highly sensitive for detecting CC with a linear range of 1-50 nM and a detection limit of 0.25 nM under a typical signal-to-noise ratio of 3 to 1 (S/N=3), and for sensing GSH with a linear range of 2-100 nM and a detection limit of 0.5 nM (S/N=3). Meanwhile, the developed B-CQDs show a good selectivity for sensing CC and GSH under high concentrations of interfering substances, such as biological thiols and amino acids. The B-CQDs are successfully applied to determination of CC in river water and GSH in human serum, where the recoveries are 103.3%-106.0% and 99.8%-106.3% for CC and GSH sensing, respectively. The signal-off-on mechanisms of the B-CQDs sensor are discussed.
关键词： Glutathione,B-doped carbon quantum dot,Sensitivity,Fluorescent sensing,Catechol
更新于2025-09-23 15:19:57
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A novel Co(II) based multifunctional metal-organic framework: synthesis, fluorescence sensing and magnetic analysis
摘要： A new coordination Co(II) complex, namely, [Co2(DIPT)4(PClA)2Cl2]·H2O ( NCl-1 ) ( DIPT= 2-(2,4-dichlorophenyl) -1H-imidazo [4,5-f]-[1,10]phenanthroline, HPClA=3-(2-chlorophenyl)acrylie ) has been synthesized under solvothermal conditions and structurally characterized by elemental analysis, IR spectroscopy, single-crystal X-ray diffraction analysis, nitrogen adsorption analysis and powder X-ray diffraction. NCl-1 constructed by six coordinated mode with metal center and connected different ligands and ions, exhibits a three-dimensional structure under interactions of hydrogen bond and π-π stacking interactions. The luminescence explorations demonstrated that NCl-1 exhibits highly selective and sensitive sensing for organic solvents ( MeOH ) and metal ion ( Fe3+ ). Furthermore, magnetic analysis indicated that NCl-1 also own the property of anti ferromagnetic.
关键词： Crystal structure,Magnetic property,Fluorescent sensing,Hydrothermal synthesis
更新于2025-09-11 14:15:04
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Molecular recognition and fluorescent sensing of urethane in water
摘要： Molecular recognition and fluorescent sensing of Group 2A carcinogen -- urethane was achieved in aqueous solution. The molecular sensors are the endo-functionalized molecular tubes with amide protons in the hydrophobic cavity. 1H NMR, fluorescence, and ITC titrations and single crystal X-ray crystallography reveal the binding stoichiometry, the binding affinities, and the driving forces. The binding is mainly driven by the hydrophobic effect through releasing the “high-energy” cavity water with minor contribution from hydrogen bonding. In addition, the syn-configured molecular tube was found to be a good fluorescent sensor for urethane in water (concentration range: 6.2 μmol/L - 60 μmol/L) and in beer (concentration range: 22.9 μmol/L – 60 μmol/L).
关键词： Molecular recognition,Urethane,Host-guest Chemistry,Fluorescent sensing
更新于2025-09-10 09:29:36
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CeO2 Nanowire-BODIPY-Adenosine Triphosphate Fluorescent Sensing Platform for Highly Specific and Sensitive Detection of Arsenate
摘要： Effective and sensitive monitoring of arsenate in drinking water is significant for risk management of public health. Here, we demonstrated that CeO2 nanowire acted as an efficient quencher for small fluorescent molecules with phosphate group, BODIPY-adenosine triphosphate (BODIPY-ATP) and riboflavin-5'-phosphate (Rf-P), and developed CeO2 nanowire-BODIPY-ATP platform for highly selective and sensitive detection of arsenate. The response strategy was based on the competitive coordination chemistry of CeO2 nanowire between arsenate and phosphate group of BODIPY-ATP. Arsenate displaced adsorbed BODIPY-ATP to enhance fluorescence, allowing detection of arsenate down to 7.8 nM, which is lower than the WHO defined limit 130 nM. Excellent linear range of 20-150 nM and 150-1000 nM was obtained. Importantly, this system was simple in design and convenient in operation. And the platform exhibited excellent selectivity for arsenate without the interference of phosphate ions. Finally, the proposed method had been successfully employed for determination of arsenate in real water samples.
关键词： competitive coordination,BODIPY-ATP,CeO2 nanowire,arsenate,fluorescent sensing
更新于2025-09-09 09:28:46
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Game Theory in Molecular Nanosensing System for Rapid Detection of Hg2+ in Aqueous Solutions
摘要： Game theory—the scientific study of interactive, rational decision making—describes the interaction of two or more players from macroscopic organisms to microscopic cellular and subcellular levels. Life based on molecules is the highest and most complex expression of molecular interactions. However, using simple molecules to expand game theory for molecular decision-making remains challenging. Herein, we demonstrate a proof-of-concept molecular game-theoretical system (molecular prisoner’s dilemma) that relies on formation of the thymine–Hg2+–thymine hairpin structure specifically induced by Hg2+ and fluorescence quenching and molecular adsorption capacities of cobalt oxyhydroxide (CoOOH) nanosheets, resulting in fluorescence intensity and distribution change of polythymine oligonucleotide 33-repeat thymines (T33). The “bait” molecule, T33, interacted with two molecular players, CoOOH and Hg2+, in different states (absence = silence and presence = betrayal), regarded as strategies. We created conflicts (sharing or self-interest) of fluorescence distribution of T33, quantifiable in a 2 × 2 payoff matrix. In addition, the molecular game-theoretical-system based on T33 and CoOOH was used for sensing Hg2+ over the range of 20 to 600 nM with the detection limit of 7.94 nM (3σ) and for determination of Hg2+ in pond water. Inspired by the proof-of-concept for molecular game theory, various molecular decision-making systems could be developed, which would help promote molecular information processing and generating novel molecular intelligent decision systems for environmental monitoring and molecular diagnosis and therapy.
关键词： fluorescent sensing,thymine–Hg2+–thymine,game theory,Hg2+,cobalt oxyhydroxide nanosheets
更新于2025-09-04 15:30:14