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3D water-stable europium metal organic frameworks as a multi-responsive luminescent sensor for high-efficiency detection of Cr <sub/>2</sub> O <sub/>7</sub><sup>2?</sup> , MnO <sub/>4</sub><sup>?</sup> , Cr <sup>3+</sup> ions and SDBS in aqueous solution
摘要： A microporous europium metal–organic framework (Eu-MOF), namely, {[Eu3(bpydb)3(HCOO)(OH)2(DMF)]·3DMF·2H2O}n (1) with asymmetric trinuclear metal clusters extended by 4,40-(4,40-bipyridine-2,6-diyl) dibenzoic acid has been synthesized via the solvothermal method. PXRD of 1 confirms that it possesses excellent water stability and pH stability. The photo-luminescence properties of 1 exhibit effective recognition of Cr2O72?, MnO4?, and Cr3+ ions and SDBS. Furthermore, a wide linear range, high quenching constant and a low detection limit reveal that 1 can potentially act as a luminescence-based sensor for quantitative and highly sensitive detection of Cr2O72?, MnO4?, and Cr3+ ions as well as SDBS in aqueous solutions. To the best of our knowledge, the detection limit of 1 is the lowest value reported for Ln-MOF-based luminescent sensors to detect Cr2O72? ions (0.5 mM) in aqueous solutions. The use of a rare earth fluorescent probe for detecting MnO4? ions is not common. It is the first time that Ln-MOF as a fluorescence probe is used for detecting SDBS. Moreover, fluorescent-based test papers of 1 have also been prepared, which can be helpful to develop visual detection for Cr2O72?, MnO4?, and Cr3+ ions as well as SDBS in daily applications.
关键词： aqueous solution,SDBS,MnO4?,luminescent sensor,Cr2O72?,europium metal–organic framework,Cr3+ ions
更新于2025-09-10 09:29:36
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A Bifunctional Luminescent Coordination Polymer as Recyclable Sensor for Detecting TNP and Fe3+ with High Selectivity and Sensitivity
摘要： A thermo-stable three dimensional network [Cd2(BPDPE)2(1,2-H2bdc)2]n (1) (1,2-H2bdc = 1,2-benzenedicarboxylic acid, BPDPE = 4,4′-bis(pyridyl)diphenyl ether) with blue fluorescence was successfully synthesized and characterized. Complex 1 is a two-dimensional layer constructed by BPDPE connecting [Cd(1,2-bdc)]n one-dimensional chains, then a three-dimensional network is finally formed via π···π interactions. Importantly, Complex 1 presents an excellent fluorescent MOF sensor for highly sensitive and selective detecting TNP, the Ksv is up to 1.03×105 M-1. Further more, complex 1 can be quickly regenerated by simple washing, exhibiting good recyclability for detecting TNP. In addition, complex 1 shows higher sensitive fluorescent sensor for detecting Fe3+ cation than other metal ions. the Ksv is calculated to be 1.84×105 M-1. Furthermore, the quenching mechanisms of complex 1 as bifunctional sensor were studied as well.
关键词： Nitro aromatic explosives,Selectivity and sensitivity,Fluorescence sensing,Metal ions,Coordination polymer
更新于2025-09-10 09:29:36
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Selective Recognition of Fe(III) in Aqueous Environment over Covalently-Bonded Tb-Complex-Containing Fluorescent Porous Copolymer Microspheres
摘要： An environment-friendly synthesis of a covalently bonded terbium(Tb)-complex-containing monodispersed fluorescent porous copolymer microspheres, and their highly selective detection of Fe3+ are described. The as-made copolymer microspheres exhibit intense green fluorescence originating from Tb ions and high photostability in water. Encouragingly, the fluorescence of the copolymer microspheres can be selectively quenched by trace Fe3+ due to the interaction between Fe3+ and the ligands, which disturbs the coordination structure of Tb-complexes and inhibits the energy transfer from ligands to Tb ions. The intense fluorescence intensity, high fluorescence stability, together with the nanoscale and porous nature of the copolymer microsphere endows them with wide detection range (0–1500 μm) and low detection limit (2.1 μm) for selective recognition of Fe3+ in aqueous environment. This study paves a new pathway for the function of porous copolymer microspheres being used as targeting for biological detection and environmental issues.
关键词： Tb-complex,fluorescence sensors,iron ions,luminescence,polymer microspheres
更新于2025-09-10 09:29:36
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Comprehensive Supramolecular Chemistry II || Fluorescent Sensors for Biological Metal Ions
摘要： All living organisms require metals. They have vital roles as catalysts, osmotic regulators, signaling molecules, and transport molecules. Many different metals are present in the human body, and carry out a range of essential functions: for example, oxygen travels in the blood bound to iron in hemoglobin, neurons communicate by changing their sodium and potassium levels, and metal catalysts like manganese in superoxide dismutase speed up biochemical reactions.1 Although metals are so essential, they make up less than 3% of the human body by weight. The most abundant metals found in the body belong to periodic groups I and II, including calcium (1.5%), potassium (0.4%), sodium (0.2%), and magnesium (0.1%). Essential transition metals are considered to be trace elements because they collectively make up less than 0.1% of body mass. These include zinc, chromium, vanadium, cobalt, copper, manganese, molybdenum, and tin.2,3
关键词： Fluorescent Sensors,Biological Metal Ions,Fluorescence Imaging,Metal Probes,Ratiometric Probes
更新于2025-09-10 09:29:36
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Theoretical wavelengths, energy levels, lifetimes, and transition probabilities for the silicon isoelectronic sequence Cd XXXV-Ba XLIII, W LXI
摘要： We have performed the theoretical calculations of wavelengths and excitation energies from ground state for 56 ?ne-structure levels as well as of oscillator strengths and radiative decay rates for all the electric dipole (E1), magnetic dipole (M1), electric quadrupole (E2), and magnetic quadrupole (M2) transitions among these levels of the terms belonging to the 3s23p2, 3s23p3d, 3s3p3, 3s3p23d, 3s23d2, and 3p4 con?gurations for the silicon isoelectronic sequence Cd XXXV-Ba XLIII, W LXI. The calculation is based on the multicon?guration Dirac–Fock approach, and Breit interaction and quantum electrodynamic corrections are included. Electron correlation effects are taken into account by means of the expansions in terms of a basis of con?guration state functions. To achieve the accuracy of the data, independent calculation is provided with similar data obtained from the ?exible atomic code, taking W LXI as an example. Our results are compared with each other, and other available theories/experimental values and the energy levels/transition rates for a majority of strong transitions are found to be accurate to be better than 0.5%/10%. The present atomic data should be useful in controlled thermonuclear fusion research and technical plasma modeling.
关键词： Energies,Transition rates,Wavelengths,Si-like ions
更新于2025-09-10 09:29:36
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Encyclopedia of Spectroscopy and Spectrometry || Optical Spectroscopy of Rare-Earth Ions in the Solid State
摘要： The birth of optical spectroscopy as science can be considered from the time when in 1672 Isaac Newton published his famous paper describing the results of experiments where, using a glass prism, he decomposed a beam of sunlight into its optical spectral components ranging from blue to red. Since that time, scientists and engineers studied a broad range of phenomena associated with the interaction of light with matter, using the fact that light actually contains different spectral components. Within a field of optical spectroscopy, it is hard to underestimate the importance of optical spectroscopy of different optical centers in solid-state materials because of numerous scientific and industrial applications of such optical systems. These applications range from studying fundamental properties of impurity centers in solids, solid-state material properties, up-conversion devices, scintillators, and Faraday rotators to a creation of solid-state lasers.
关键词： rare-earth ions,Fu¨chtbauer–Ladenburg theory,optical spectroscopy,Judd–Ofelt theory,McCumber theory,electron–phonon coupling,Franck–Condon principle,solid state
更新于2025-09-10 09:29:36
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spectroscopy
摘要： We apply point-particle effective field theory to electronic and muonic 4He+ ions, and use it to identify linear combinations of spectroscopic measurements for which the theoretical uncertainties are much smaller than for any particular energy levels. The error is reduced because these combinations are independent of all short-range physics effects up to a given order in the expansion in the small parameters R/aB and Zα (where R and aB are the ion’s nuclear and Bohr radii). In particular, the theory error is not limited by the precision with which nuclear matrix elements can be computed, or compromised, by the existence of any novel short-range interactions, should these exist. These combinations of 4He measurements therefore provide particularly precise tests of quantum electrodynamics. The restriction to 4He arises because our analysis assumes a spherically symmetric nucleus, but the argument used is more general and extendable to both nuclei with spin, and to higher orders in R/aB and Zα.
关键词： 4He+ ions,spectroscopy,quantum electrodynamics,nuclear physics,effective field theory
更新于2025-09-10 09:29:36
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Plasmon-enhanced upconversion photoluminescence: mechanism and application
摘要： The enhanced local electromagnetic field (EM) excited on the noble metallic nanostructure exhibits potential application in various areas, particularly in surface-enhanced spectroscopy (SES). Resonant coupling of SPs to luminous centers can strongly moderate the emission spectra properties, including the angular distribution, the intensity, the speed of radiative decay, and even the spectrum radiation polarization, or so-called plasmon-enhanced fluorescence (PEF). Due to the low efficiency of emission and small absorption section of rare earth ions, plasmon-enhanced upconversion photoluminescence(PUCPL) has attracted increasing attention recently. In this review, we focus on recent advanced reports on PUCPL. First, the mechanism of the conventional upconversion process and related reports will be introduced. We will then demonstrate that the introduction of plasmonic nanostructure, including nonperiodic and periodic metallic nanostructures, has a critical effect on upconversion nanoparticles(UCNPs). The recent advances in plasmon-enhanced fluorescence with metallic tip configuration are also noted. Finally, the recent applications of PUCPL are introduced. As a result, the combination of a rare-earth luminescent center with plasmonic nanostructure can largely expand the application of upconversion materials.
关键词： surface-enhanced spectroscopy,mechanism,plasmonic nanostructure,Plasmon-enhanced upconversion photoluminescence,application,rare earth ions
更新于2025-09-10 09:29:36
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Heavy ion-induced single event effects in active pixel sensor array
摘要： The complementary metal-oxide-semiconductor (CMOS) active pixel sensors (APSs) can easily be susceptible to heavy-ion radiation in space applications. In this paper, pinned photodiode (PPD) active pixel sensor array have been exposed to heavy ion (Xe, Kr) with linear energy transfer (LET) (50.34, 37) and single event effects (SEEs) were studied. Devices were fully functional and integration time was changed during exposure, No single event latch-up (SEL) and single event functional interrupt (SEFI) happened. However single event transient (SET) effect happened, that is, a dark background with pixel clusters. The number of the pixel clusters, Total collected charge and cluster size were analyzed. Finally, SRIM simulations were conducted on a PPD with aim to predict the number of the electron-hole pairs generated by a heavy ion.
关键词： heavy ions,CMOS active pixel sensor (APS),SEE
更新于2025-09-10 09:29:36
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Light-emitting defects formed in GeO/SiO2 heterostructures with assistance of swift heavy ions
摘要： Germanium suboxide films and GeO/SiO2 multilayer heterostructures deposited onto Si(001) substrates using evaporation in high vacuum were modified using irradiation of 167 MeV Xe+26 ions with fluences varying from 1011 to 1013 cm?2. According to Raman spectroscopy data, the swift heavy ion irradiation does not lead to the expected decomposition of germanium suboxide in germanium nanoclusters and GeO2. Infrared absorption spectroscopy measurements show that under irradiation the GeO/SiO2 layers were intermixed with formation of Ge-O-Si bonds. We report strong photoluminescence in the visible range at room temperature, which is most probably due to Ge-related defect-induced radiative transitions. Moreover, a new infrared luminescence band (~0.8 eV) was observed in irradiated structures, which can be related to defects or defects complexes in GexSiyO2 glass.
关键词： swift heavy ions,Ge oxides,GexSiyO2 glasses,Luminescence,defects
更新于2025-09-10 09:29:36