37470-42-1Relevant articles and documents
Photoluminescence performance of green light emitting terbium (III) complexes with β-hydroxy ketone and nitrogen donor ancillary ligands
Khanagwal, Jyoti,Kumar, Rajesh,Devi, Rekha,Bala, Manju,Sehrawat, Priyanka,Khatkar,Taxak
, p. 742 - 754 (2021)
An efficient and cost-effective technique, solution precipitation approach is adopted to synthesize five bright green luminescent terbium (III) complexes by employing the main β-hydroxy ketone ligand, 2-hydroxy-4-ethoxyacetophenone, and ancillary ligands like bathophenanthroline, 5,6-dimethyl-1,10-phenanthroline, 1,10-phenanthroline, and 2,2-bipyridyl. The elemental compositions and binding mode of ligand to terbium (III) ion can be validated by using energy dispersive X-ray analysis, elemental analysis, Fourier transform infrared, and proton nuclear magnetic resonance spectroscopy. The complexes are thermally stable up to 158°C and possess the cubic shaped particles as confirmed by thermogravimetric analysis and scanning electron microscopic study, respectively. The band-gap energy (3.02–2.92 eV) of complexes is reckoned through diffuse reflectance spectra, which tailors them as potential candidates in the field of military radars. The photoluminescence studies unveil that the complexes exhibit the bright green luminescence corresponding to 5D4 → 7F5 transition of Tb3+ ion (548 nm) under the excitation wavelength of 395 or 397 nm. The Commission International de I’Eclairage chromaticity coordinates (x, y) and color purity substantiates the green emission of complexes. The energy transfer mechanism elucidates that the main ligand and ancillary ligands sensitize Tb3+ ion, which in turn enhances the luminescence efficiency of the emissive layer of white organic light emitting diodes. The results reveal that the complexes are considered as good contenders in the field of display devices and laser technology. Lastly, in vitro antimicrobial and antioxidant activity proclaim the potent antimicrobial and antioxidant actions of complexes via tube dilution and 2, 2-diphenyl-1-picrylhydrazyl assays, respectively.
Designing of luminescent complexes of europium(III) ion with hydroxyl ketone and nitrogen donor secondary ligands for improving the luminescence performance and biological actions
Hooda, Pooja,Khanagwal, Jyoti,Khatkar, S. P.,Kumar, Rajesh,Poonam,Taxak, V. B.
, (2021)
Europium based five luminescent europium(III) complexes with 2-hydroxy-4-ethoxyacetophenone (main ligand) and second chromophores, bathophenanthroline, 5,6-dimethyl-1,10-phenanthroline, 1,10-phenanthroline and 2,2-bipyridyl have been prepared by employing cost-effective solution precipitation method. The various advanced techniques are employed to investigate the structural information. Thermal study proclaims the thermal stability of complexes up to 155 °C. The analyzed band-gap for complexes opens the application of these complexes in laser system. The photoluminescent properties of complexes under ultraviolet light clearly reveal the presence of prominent emission peak (5D0→7F2 transition) centered at 611 nm responsible for intense red emission of complexes, which highlights the applicability of these complexes in advanced optoelectronic devices. Judd-Ofelt intensity parameters, internal quantum efficiency and sensitization mechanism confirm the luminescence efficiency of complexes. The complexes display the excellent antimicrobial and antioxidant features.
Natural product Hirtellanine B and its derivatives in the preparation process for the preparation of medicine for treating tumor with the application of the
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Paragraph 0065; 0150, (2016/10/10)
The present invention provides a preparation method of a natural product Hirtellanine B, wherein 2,4,6-trihydroxyacetophenone is adopted as a raw material, and steps of compound a preparation, compound b preparation, compound c preparation, compound d preparation, compound e preparation, compound f preparation, compound g preparation, and the like are performed to prepare the natural product Hirtellanine B. According to the present invention, biological activity screening is performed on Hirtellanine B and 14 Hirtellanine B derivatives, and results show that the natural product Hirtellanine B can inhibit proliferations of Jurkat cells, Raji cells and K562 cells, and the compounds provide a certain inhibition activity for tumor cells. The method has characteristics of easily available raw material, high reaction yield and reasonable operation, and is suitable for industrial production. The Hirtellanine B and the derivatives thereof can be used for preparing tumor treatment drugs, and have great clinical values. The natural product Hirtellanine B preparation method reaction formulas are as the follows.
