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Unprecedented surface stabilized InP quantum dots with bidentate ligands
摘要： For InP-based QDs, the current technology does not outperform CdSe-based QDs in many respects, one of which is stability. The optical stability of QDs is closely related to their surface properties, so QDs often use organic ligands for surface protection. These organic ligands are dynamically attached and detached on the QD surface; during detachment, their surfaces are easily damaged and oxidized, thereby deteriorating their optical characteristics. Therefore, we have synthesized a ligand 1,2-hexadecanedithiol with a bidentate form, inducing one ligand to bind to the QD surface strongly through the chelate effect, as a good way to improve the stability of the QDs; thus, the PL stability of the green-light-emitting InP-based QDs was greatly increased. To confirm the existence of the dithiol ligand, we used thermogravimetric analysis/simultaneous thermal analysis-mass spectroscopy (TGA/STA-MS). After that, we applied the ligand to blue-light-emitting ZnSe QDs and red-light-emitting InP QDs, and for those two types of QD we also confirmed that the stability was increased. Additionally, we tested dithiol exchanged QDs at a high temperature of 150 °C, and the increase of stability was effective even in a high temperature condition.
关键词： stability,quantum dots,bidentate ligands,InP-based QDs,TGA/STA-MS
更新于2025-09-23 15:19:57
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Bismuth(III) based Metal Organic Frameworks: Luminescence, Gas Adsorption, and Antibacterial Studies
摘要： BiIII-MOFs 1–4 were prepared via solvothermal method using four organic linkers; 2-mercapto-3-methyl-4-thiazoleacetic acid (H2MMTA), 2,6-naphthalenedicarboxylic acid (2,6-NDA), 4,6-dihydroxy-2-mercaptopyrimidine (H2DMP), and 4-mercaptobenzoic acid (H2MBA), respectively. The resulting MOFs were structurally/morphologically characterized by UV/Vis, AAS/ICP-MS, Fourier transform infrared spectroscopy (FT-IR), 1H NMR, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and powder X-ray diffraction technique. All these MOFs showed good luminescence properties exhibiting blue luminescence. N2 gas adsorption isotherms of 1–4 confirmed the porosity of these frameworks. In order to evaluate the effect of metal ion upon chelation, the free organic linkers and respective MOFs were screened for their antibacterial potential against some pathogenic bacteria and appreciable activity was observed.
关键词： Metal organic frameworks,Luminescence,Bismuth,Bidentate ligands
更新于2025-09-04 15:30:14
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Synthesis and Characterization of <i>N</i> , <i>N</i> ′-Bismesityl Phenanthrene-9,10-diimine and Imine–Nitrone
摘要： The sterically bulky compounds N,N′-bismesityl phenanthrene-9,10-diimine [1] and imine?nitrone [2] were synthesized. To the best of our knowledge, this is the first report of the synthesis of a bulky steric imine?nitrone accessed from the secondary ketimine using urea hydrogen peroxide over methyltrioxorhenium catalyst. Purified compounds were characterized using 1H and 13C NMR, high-resolution mass spectrometry, and infrared spectrometry. We report the first crystal structure of compound 1. Detailed IR bands of compounds 1 and 2 were assigned by comparing experimentally measured spectra to individually animated modes of quantum mechanically computed spectra. We believe these compounds may be of use as bidentate ligands in the synthesis of novel organometallic compounds. The asymmetric N and O coordination sites of compound 2 might impart interesting electronic effects to organometallic compounds compared to the symmetric N,N′-coordination sites of compound 1.
关键词： organometallic compounds,quantum mechanically computed spectra,N,N′-bismesityl phenanthrene-9,10-diimine,urea hydrogen peroxide,imine?nitrone,bidentate ligands,methyltrioxorhenium catalyst
更新于2025-09-04 15:30:14