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Interaction of TbCl_3 and lanthanide complexes with poly(N-vinylpyrrolidone)

Journal of Rare Earths 2014年第3期32卷 282-287页

作者： M.Karbowiak J.Cichos K.Buczko Faculty of Chemistry University of Wroc?aw

The interaction of TbC13 and lanthanide（Ⅲ） β-diketonate complexes with poly（N-vinylpyrrolidone）（PVP） polymer was studied using fluorescence spectroscopy. In the presence of PVP the emission of Tb3＋ in cthanolic solution of TbCl3 significantly in- creased owing to the excitation energy transfer from PVP to Tb3＋ ions, which was more efficient as compared to a direct excitation of the Tb3＋ 4f75d1 levels. In contrast, emission of NEt4Tb（hfa）4 and NEt4Eu（hfa）4 complexes was almost completely quenched in solu- tion containing PVP. The PVP bound both Ln3＋ ions and hfa ligands which caused decomposition of Ln-hfa complexes and switched off the excitation energy transfer from the ligand to the emitting Ln3＋ ion. The important role of hydrogen bonds in stabilization of in- teraction ofhfa ligands with PVP was indicated.

关键词： poly(N-vinylpyrrolidone) PVP lanthanide(Ⅲ) TbCl3 emission quenching rare earths

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Histidine‑Stabilized Copper Nanoclusters as a Fluorescent Probe for Selective and Sensitive Determination of Vitamin B_(12)

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Journal of Analysis and Testing 2018年第2期2卷 168-174页

作者： Krishnamoorthy Shanmugaraj Thangarasu Sasikumar Malaichamy Ilanchelian Centre for Nanoscience and Nanotechnology Department of ChemistryThe Gandhigram Rural InstituteGandhigramDindigulTamil Nadu 624302India Department of Chemistry Bharathiar UniversityCoimbatoreTamil Nadu 641046India

Herein,we report the highly sensitive and selective determination of vitamin B_(12)(VB_(12))using histidine-stabilized copper nanoclusters(His-CuNCs)as a fluorescent probe by the spectrofluorometry *** as-synthesized His-CuNCs were characterized by UV–Vis absorption,steady-state emission,and high-resolution transmission electron microscopy ***-CuNCs exhibited an emission maximum around 443 nm,when excited at 350 *** emission intensity of His-CuNCs was significantly quenched by the addition of VB_(12),hinting that the synthesized probe can be employed for sensing of VB_(12).Based on the decrease in emission intensity,the concentration of VB_(12) was determined and the emission intensity of His-CuNCs can be quenched by VB_(12) via fluorescence resonance energy-transfer ***-CuNCs showed high selectivity toward the determination of VB_(12) in the presence of other potentially interfering vitamins,cations,and *** addition,the proposed sensing platform displayed a sensitive response to VB_(12) in the linear range of 4.00–28.00×10^(−6) mol dm^(−3) with a limit of detection of 3.30×10^(−9) mol dm^(−3).The proposed sensing system is simple,low cost,selective,and sensitive for the determination of VB_(12) in biological samples.

关键词： Histidine-stabilized copper nanoclusters Energy transfer Spectrofluorometry emission quenching Vitamin B_(12)

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