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A novel NIR-emissive probe with large Stokes shift for hypochlorite detection and imaging in living cells
摘要： Due to the importance of hypochlorite (ClO-) in the process of life, a near-infrared region (NIR) emissive probe (DCPO-DMTC) with large Stokes shift was synthesized for the selective detection of hypochlorite. This probe detects exogenous and endogenous hypochlorite via "oxidative deprotection" of dimethylthiocarbamate-protected phenolic hydroxyl groups. The response was monitored by time-course UV–Vis and fluorescent spectroscopy. The emission response of the probe to ClO? presented a good linear relationship in the 0–100 μM concentration range, and the LOD of this probe was 164 nM. The probe was used to successfully visualize endogenous ClO- generation in RAW 246.7 cells under external stimulation.
关键词： NIR-emissive,Large Stokes-shift,Hypochlorite,Bioimaging
更新于2025-09-23 15:22:29
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Counter Anion Effect on the Photophysical Properties of Emissive Indolizine-Cyanine Dyes in Solution and Solid State
摘要： Near-infrared emissive materials with tunable Stokes shifts and solid-state emissions are needed for several active research areas and applications. To aid in addressing this need, a series of indolizine-cyanine compounds varying only the anions based on size, dipole, and hydrophilicity were prepared. The effect of the non-covalently bound anions on the absorption and emission properties of identical π-system indolizine-cyanine compounds were measured in solution and as thin films. Interestingly, the anion choice has a significant influence on the Stokes shift and molar absorptivities of the dyes in solution. In the solid-state, the anion choice was found to have an effect on the formation of aggregate states with higher energy absorptions than the parent monomer compound. The dyes were found to be emissive in the NIR region, with emissions peaking at near 900 nm for specific solvent and anion selections.
关键词： solid-state emission,optical materials,NIR emissive materials,indolizine cyanine,stokes shift
更新于2025-09-23 15:22:29
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Quantitative Sensitization Efficiencies in NIR-Emissive Homoleptic Ln(III) Complexes Using 2-(5-Methylpyridin-2-yl)-8-hydroxyquinoline
摘要： A series of lanthanide complexes [Ln(MPQ)3] (Ln = Nd, Gd, Er, Yb, Lu) using a monoanionic tridentate methylpyridyl-substituted 8-hydroxyquinoline ligand (MPHQ = 2-(5-methylpyridin-2-yl)-8-hydroxyquinoline) have been prepared and characterized using elemental analysis (CHN), single-crystal X-ray diffraction (XRD), and 1H NMR spectroscopy. This ligand forms homoleptic charge-neutral lanthanide complexes with three coordinated ligands arranged in an 'up?up?down' fashion around the metal center. The photophysical properties of the Nd, Er, and Yb complexes were investigated using absorption and emission spectroscopy, with the latter species displaying efficient sensitization in the Near Infra-Red (NIR) region and a photoluminescence quantum yield (PLQY) as high as 1.0% in CH2Cl2 solution. The intersystem crossing and energy-transfer processes involved in the antenna effect were further investigated using transient absorption techniques, which revealed essentially quantitative sensitization efficiencies for the NIR-emitting cations.
关键词： lanthanide complexes,8-hydroxyquinoline ligand,homoleptic,quantitative sensitization efficiencies,NIR-emissive
更新于2025-09-23 15:21:01