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A through-bond energy transfer-based ratiometric fluorescent pH probe: For extreme acidity and extreme alkaline detection with large emission shifts
摘要： A ratiometric fluorescence pH probe 1 based on through-bond energy transfer (TBET) with a 2-(2-hydroxyphenyl)benzoxazole (HBO) as donor and a Rhodamine derivative as acceptor is developed through simple condensation reaction. The probe exhibits a ratiometric fluorescence emission (I593/I422) characteristics and linear response to extreme acidity range of 5.00-2.88, and a ratiometric fluorescence emission (I555/I422) characteristics and linear response to extreme alkaline range of 10.00-13.78, respectively. Moreover, 1 possesses highly selective response to pH over metal ions, good reversibility and excellent photostability. Probe 1 is cellpermeable and can distinguish near pH 5.55 fluctuations in Hela cells. Furthermore, 1 can be immobilized on a test paper, which shows a rapid and reversible colorimetric response to HCl/NH3 vapor by the naked-eye.
关键词： ratiometric fluorescent response,pH sensing,large emission shifts,through-bond energy transfer,fluorescent probe
更新于2025-11-21 11:24:58
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Effect of Unsymmetrically Branched Alkyl Chains on the Electrochemical Band Gap and Thermal Stability of the PCDTBT
摘要： This work introduces a modified poly[N-9’-heptadecanyl-2,7-carbazole-alt-5,5-(4’,7’-di-2-thienyl-2’,1’,3’-benzothiadiazole)] (PCDTBT) with the unsymmetrically branched N-alkyl chain, which name as poly[N-9’-(2-hexyldecyl)-2,7-carbazole-alt-5,5-(4’,7’-di-2-thienyl-2’,1’,3’-benzothiadiazole)] (P1). The synthesis of P1 involves dimerization, cyclization, tosylation, N-alkylation, bromination, Stille’s and Suzuki’s coupling reactions. Suitable analysis techniques have used to study the chemical, physical, electrochemical, optical, and thermal properties of P1. The analysis results show that P1 possesses higher HOMO and LUMO energy levels than the previously reported PCDTBT, which have been narrowing the electrochemical band gap down to 1.58 eV. However, the P1 experiences 5% thermal degradation at 280 °C, which is relatively less favourable than the PCDTBT. Hence, the replacement of the symmetrically branched alkyl chains of PCDTBT with unsymmetrically branched alkyl chains results in both improvement and draw-back on the characteristics of the polymer.
关键词： bond energy,Alkylation,cyclic voltammetry,electrochemistry,polymerization
更新于2025-11-19 16:56:35
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Mechanism Behind the Easy Exfoliation of Ga <sub/>2</sub> O <sub/>3</sub> Ultra-Thin Film Along (100) Surface
摘要： The transparent wide band gap semiconductor β-Ga2O3 has gained wide attention due to its suitability to a wide range of applications. Despite not being a van der Waals material and having highly strong ionic bonding, the material can be mechanically cleaved and exfoliated easily along favorable surfaces to make ultra-thin layers and used in device fabrications. One of the interesting properties of this material is that thin layers preserve the pristine bulk-like electronic properties, which makes it even more promising for applications in power devices. However, very little is known about the mechanism why such ultra-thin film or even single bilayer exfoliation is favorable from the bulk. In this letter, we have explained the mechanism of such phenomenon by detailed analyses of different types of Ga–O bonding character. The protocol of methodology used and developed in this study can be utilized in general to understand bond breaking and forming of other complex materials as well. This understanding will give us a better control to fabricate thin film 2D devices.
关键词： density functional theory,bond energy,computational physics,2D Ga2O3,easy exfoliation,surface energy
更新于2025-09-23 15:23:52
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The Bond-Energy Method in Site Occupancy and Property of Eu <sup>3+</sup> Doped in SrAl <sub/>2</sub> B <sub/>2</sub> O <sub/>7</sub> Phosphors
摘要： The SrAl2B2O7:1%Eu3+ phosphors were obtained by solid-state reaction. Photoluminescence (PL) spectra are characterized the property of samples, and under the excitation of 394 nm, the sharp emission lines of SrAl2B2O7:1%Eu3+ can be assigned to Judd-Ofelt transitions (5D0–7FJ) of Eu3+, which are 5D0–7F1, 5D0–7F2, 5D0–7F3, and 5D0–7F4. The bond energy method is used to determine the site occupancy, and the occupancy of Eu3+ can be determined by comparing the deviation of its bond energy in different locations at Sr2+, Al3+ and B3+ sites. Theoretical calculation result indicates that Eu3+ would preferentially occupy the smaller energy variation sites Sr2+.
关键词： Eu3+,Site Occupancy Preference,SrAl2B2O7,Bond-Energy Method
更新于2025-09-23 15:22:29
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The Bond-Energy Method in Site Occupancy and Property of High Concentration Eu <sup>3+</sup> in Sr <sub/>2</sub> CeO <sub/>4</sub> Phosphors
摘要： The low concentration of Eu3+ doped Sr2CeO4 phosphors has been widely studied in recent years and in this paper, we researched the properties of high concentration Eu3+ doped in Sr2CeO4. The Sr2Ce(1?x)Eu4?x/2 (x = 0, 1%, 10%, 20%) phosphors were obtained by traditional solid-state reaction. Photoluminescence (PL) spectra are characterized the property of samples. PL spectra illustrate that the concentration of Eu3+ increased, the intensity of 5D0-7F1, 5D0-7F2 increased and intensity of Sr2CeO4 host emission intensity was decreased. The phenomenon can be ascribed to the energy transfer from Ce4+ to Eu3+. When the concentration of Eu3+ is 20%, the completely red emission can be obtained even if no other ions are doped under the excitation wavelength of 350 nm, it is proved that Eu3+ occupied Ce sites rather than Sr site in Sr2CeO4 samples. The conclusion we make is due to the value of ΔE Eu-Ce-O and ΔE Eu-Sr-O calculated by bond-energy method, the smaller the value, the easier it is for the doped ions Eu3+ to enter the site.
关键词： Site Occupancy Preference,High Concentration,Eu3+ Doping,Bond-Energy Method,Sr2CeO4
更新于2025-09-19 17:15:36
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Development of a Prea??assembled TBET Fluorescent Probe for Ratiometric Sensing of Anticancer Platinum(ll) Complexes
摘要： Fluorescence microscopy has emerged as an attractive technique to probe intracellular processing of Pt-based anticancer compounds. Herein, we reported the first Through-Bond Energy Transfer (TBET) fluorescent probe NPR1 designed for sensitive detection and quantitation of PtII complexes. The novel TBET probe was successfully applied for ratiometric fluorescence imaging of anticancer PtII complexes such as cisplatin and JM118 in cells. Capitalizing on the ability of the probe to discriminate between PtII complexes and their PtIV derivatives, the probe was further applied to study the activation of PtIV prodrug complexes that are known to release active PtII species after intracellular reduction.
关键词： Platinum Drugs,Fluorescent Probes,Ratiometric,Cisplatin,Through Bond Energy Transfer
更新于2025-09-19 17:13:59
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Investigations of physical parameters of Ge doped binary Se-As chalcogenide glassy alloys for optical fiber application
摘要： Germanium doped chalcogenide glasses have potential applications in non- linear and optoelectronic devices. Ternary Ge-Se-As system has been considered to study the different important physical parameters. The impact of deviation of Ge on the cost of As in Ge-Se-As glassy system has been discussed in terms of average coordination number, cohesive energy, heat of atomization, and the theoretical optical band gap of the system. Almost all the physical parameters are found to change linearly with the variation in Ge content. The physical properties approximated in the present study can reveal the structural details for optical fibers.
关键词： Chalcogenide glasses,cohesive energy,mean bond energy,glass transition temperature,lone pair electrons
更新于2025-09-16 10:30:52
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A ratiometric fluorescent probe for lysosomal hypochlorous acid based on through-bond energy transfer strategy
摘要： In this paper, we synthesized a ratiometric fluorescence probe (IRh-Ly) for lysosomal hypochlorous acid (HOCl) by adopting a through-bond energy transfer (TBET) strategy on rhodamine-imidazo[1,5-a]pyridine platform. IRh-Ly showed brilliant selectivity, rapid response for HOCl. The probe also exhibited high sensitivity with the detection limit calculated to be 10.2 nM. Moreover, we demonstrated its successful application of detecting lysosomal HOCl in living RAW264.7 cells. Notably, the morpholine was integrated into the fluorescent probe IRh-Ly and the results revealed that IRh-Ly could target lysosome and detect the lysosomal HOCl. All the unique features made IRh-Ly particularly suitable for ratiometric HOCl detection and bio-imaging applications.
关键词： Through-bond energy transfer,HOCl,Lysosomal,Ratiometric,Fluorescent probe
更新于2025-09-10 09:29:36