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| 1 | Rare earth upconversion nanophosphors: synthesis, functionalization and application as biolabels and energy transfer donors显示文摘This review focused on rare earth upconversion nanophosphors (UCNPs), a particular class of emitters whose photoluminescence mechanism is of fundamental difference from that of conventional dyes and semiconductor quantum dots. We in the first section gave a brief summary on a variety of synthetic methodologies developed during the past decades. Instead of presenting an exhaustive reference list, we selected only a few representative examples, illustrating the merits and limits of each involved synthetic route. Then we surveyed the recent progress in the functionalization techniques for these nanomaterials, depicting the modification in microstructures and improvement in properties with respect to the parent nanoparticles. And finally, we emphasized their application in the research fields of biolabeling and energy transfer, narrating their superior performance benefiting from the unique excitation and emission properties. | 张超 孙聆东 张亚文 严纯华 | 2010 | Journal of Rare Earths2010，28，6： | 14 |
| 2 | Multi-spectroscopic characterization of bovine serum albumin upon interaction with atomoxetine显示文摘The quenching interaction of atomoxetine(ATX) with bovine serum albumin(BSA) was studied in vitro under optimal physiological condition(pH=7.4) by multi-spectroscopic techniques. The mechanism of ATX-BSA system was a dynamic quenching process and was confirmed by the fluorescence spectra and lifetime measurements. The number of binding sites, binding constants and other binding characteristics were computed. Thermodynamic parameters ΔH^0 and ΔS^0 indicated that intermolecular hydrophobic forces predominantly stabilized the drug-protein system. The average binding distance between BSA and ATX was studied by F?rsters theory. UV-absorption, Fourier transform infrared spectroscopy(FT-IR), circular dichroism(CD), synchronous spectra and three-dimensional(3D) fluorescence spectral results revealed the changes in micro-environment of secondary structure of protein upon the interaction with ATX. Displacement of site probes and the effects of some common metal ions on the binding of ATX with BSA interaction were also studied. | Arunkumar T. Buddanavar Sharanappa T. Nandibewoor | 2017 | Journal of Pharmaceutical Analysis2017，7，3： | 10 |
| 3 | Recent progress of energy transfer and luminescence intensity boosting mechanism in Nd3+-sensitized upconversion nanoparticles显示文摘Rare earth doped upconversion nanoparticles can be considered as the spice of research in the field of luminescence nanomaterials due to their unique optical properties such as near-infrared excitation.Enormous works have been reported about biomedical applications of 980 nm excited and Yb^3+-sensitized upconversion nanoparticles.However,980 nm excitation wavelength overlaps with the absorption band of water molecules in the biological environment,leading to overheating effect that can induce thermal damages of normal cells and tissues.Recently,Nd^3+-sensitized upconversion nanoparticles which can be excited with 808 nm has been widely investigated as alternative nanoparticles that can surmount this issue of overheating effect.Even though Nd^3+-sensitized upconversion nanoparticles can reduce the overheating effect by 20 fold as compared to Yb^3+-sensitized counterpart,there are several factors that reduce the upconversion luminescence intensity.In this review article,photon energy harvesting and transferring mechanisms in Nd^3+,Yb^3+and emitter ions co-doped upconversion nanoparticles under 808 nm excitation are briefly discussed.Factors that affect upconversion luminescence intensity and quantum yield of Nd^3+-sensitized upconversion nanoparticles are also addressed.Besides,some of the important strategies that have been recently utilized to boost upconversion luminescence intensity of Nd^3+sensitized upco nversion nanoparticles are tho roughly summarized.Lastly,the future challenges in the area and our perspectives are in sight. | Solomon Tiruneh Dibaba Xiaoqian Ge Wei Ren Lining Sun | 2019 | Journal of Rare Earths2019，37，8： | 9 |
| 4 | Optical properties of NaY(MoO4)2:Eu3+ nanophosphors prepared by molten salt method显示文摘We synthesized NaY(MoO4)2:Eu3+phosphors of different doping concentrations by a molten salt method.This facile way possesses advantages such as simple process,lower calcination temperature(350℃)and small particle size(70 nm).The crystal system is tetragonal phase and crystal lattice is body centered.The photo luminescence measurements including emission spectra,excitation spectra and fluorescence decay curves were carried out,elucidating that NaY(MoO4)2:Eu3+can be effectively excited by near UV and blue light.Moreover,it can be concluded that Eu3+energy transfer type is exchange interaction.Huang-Rhys factor and the critical energy transfer distance(Rc)were calculated to be 0.043 and 0.995 nm,respectively.Auzel’s model was used to obtain the intrinsic radiative transition lifetime of5 D0 level(τ0=0.923 ms).Furthermore,a calculation method was used to calculate refractive index n of nontransparent NaY(MoO4)2:1 mol%Eu3+phosphor,and n was obtained to be 1.86. | Lin Bai Qingyu Meng Mingxue Huo Yu Sui | 2019 | Journal of Rare Earths2019，37，12： | 8 |
| 5 | A one-dimensional heat transfer model of the Antarctic Ice Sheet and modeling of snow temperatures at Dome A, the summit of Antarctic Plateau显示文摘A vertical one-dimensional numerical model for heat transferring within the near-surface snow layer of the Antarctic Ice Sheet was developed based on simplified parameterizations of associated physical processes for the atmosphere, radiation, and snow/ice systems. Using the meteorological data of an automatic weather station (AWS) at Dome A (80°22′S, 70°22′E), we applied the model to simulate the seasonal temperature variation within a depth of 20 m. Comparison of modeled results with observed snow temperatures at 4 measurement depths (0.1, 1, 3, 10 m) shows good agreement and consistent seasonal variations. The model results reveal the vertical temperature structure within the near-surface snow layer and its seasonal variance with more details than those by limited measurements. Analyses on the model outputs of the surface energy fluxes show that: 1) the surface energy balance at Dome A is characterized by the compensation between negative net radiation and the positive sensible fluxes, and 2) the sensible heat is on average transported from the atmosphere to the snow, and has an evident increase in spring. The results are considered well representative for the highest interior Antarctic Plateau. | CHEN BaiLian1,3, ZHANG RenHe2, SUN ShuFen1, BIAN LinGen2, XIAO CunDe4,2 & ZHANG TingJun5 1 Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China 2 Chinese Academy of Meteorological Sciences, Beijing 100081, China 3 Graduate University of Chinese Academy of Sciences, Beijing 100049, China 4 Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China 5 The National Snow and Ice Data Center, University of Colorado, Boulder, CO 80309-0449, USA | 2010 | Science China Earth Sciences2010，53，5： | 7 |
| 6 | Synthesis,characteristic and intramolecular energy transfer mechanism of reactive terbium complex in white light emitting diode显示文摘A reactive Tb(III) complex with 2-aminobenzoic acid(2-ABAH) and acrylonitrile(AN) as ligands was synthesized.The structure of the complex was characterized by elemental analysis and Fourier transform infrared spectrometry(FT-IR).The results indicated that the ligands were coordinated with Tb(III) ion.Thermal gravity-derivative thermogravimetric(TG-DTG) analysis indicated that the complex kept stable up to 198 oC.Luminescence properties were investigated by UV-vis absorption spectra and fluorescence spectra.The results suggested that being excited at 361 nm,the complex exhibited characteristic emission of Tb(III) ion,revealing that the complex could be excited by 365 nm ultraviolet chip.The HOMO and LUMO,ΔE(HOMO-LUMO),molecular frontier orbital,and the singlet state and triplet energy state levels of the ligands were calculated at the B3LYP/6-31+G(d) level.The results indicated that intramolecular energy transfer mechanism followed Dexter exchange energy transfer theory.Both the calculation for excited state of ligand and energy transfer mechanism could provide the theoretical basis for the design of high luminescent materials of rare earth complexes with organic ligands. | 张爱琴 潘启亮 贾虎生 刘旭光 许并社 | 2012 | Journal of Rare Earths2012，30，1： | 6 |
| 7 | White-light emitting single-phase phosphor La_3Si_6N_(11):Dy^(3+),Tb^(3+):Color tunable emission, thermal stability and energy transfer process显示文摘A novel white-light emitting single-phase phosphor La_3 Si_6 N_(11):Dy^(3+),exhibiting two emission peaks centering at 475 and 575 nm, was prepared via conventional solid-state reactions. The structure and morphology of La_3 Si_6 N_(11):Dy^(3+)/Tb^(3+) were investigated by X-ray diffraction(XRD) and scanning electron microscopy(SEM). The emission colors can be tuned from white to yellow-green through increasing the Tb^(3+) concentration in La_3 Si_6 N_(11):Dy^(3+),Tb^(3+), The mechanism of energy transfer(ET) from Dy^(3+) to Tb^(3+) is confirmed according to the excitation,emission spectra and decay lifetimes curve. The temperaturedependent luminescence measurements of La_(2.83)Si_6 N_(11):0.1 Dy^(3+),0.07 Tb^(3+) were also performed, and a good thermal stability is shown, suggesting superior properties for the application as white lightemitting diodes(w-LEDs) phosphor. | Yuanhong Liu Yuan Xue Ronghui Liu Mingyue Chen Guantong Chen Chunpei Yan Xia Zhang Yu'nan Zhou Wei Gao Xiaole Ma | 2019 | Journal of Rare Earths2019，37，4： | 5 |
| 8 | Cationic conjugated polymers for homogeneous and sensitive fluorescence detection of hyaluronidase显示文摘The cationic charged water-soluble polyfluorenes containing 2,1,3-benzothiadiazole (BT) units (P1-3) have been synthesized and characterized. These polymers demonstrate intramolecular energy transfer from the fluorene units to the BT sites when oppositely charged hyaluronan is added due to the formation of electrostatic complexes, followed by a shift in emission color from blue to green or brown. Upon adding hyaluronidase, the hyaluronan is cleaved into fragments. The relatively weak electrostatic interactions of hyaluronan fragments with polyfluorenes keep their main chains separated and energy transfer from the fluorene units to the BT sites is inefficient, and the polyfluorenes recover their blue emissions. The complexes of conjugated polymers/hyaluronan can be utilized as probes for sensitive and facile fluorescence assays for hyaluronidase. The new assay method interfaces with the aggregation and light harvesting properties of conjugated polymers. | AN LingLing LIU LiBing WANG Shu | 2009 | Science China Chemistry2009，52，6： | 5 |
| 9 | Efficient improvement of 2.7 μm luminescence of Er^(3+):oxyfluoride glass containing gallium by Yb^(3+) ions codoping显示文摘Mid-infrared laser materials with low phonon energy have significant applications. However, the development of available glass systems for high-power laser gain medium have posed a great challenge.Therefore, we investigated the 2.7 μm spectroscopic properties of Er^(3+)/Yb^(3+) -codoped oxyfluoride glass containing gallium, which were prepared by typically melting and quenching methods. The 2.7 μm luminescence properties of the Er^(3+)/Yb^(3+)-codoped oxyfluoride glass containing gallium were recorded by a 980 nm laser diode. The Judde Ofelt parameters, decay curves, emission cross section, energy transfer efficiency and quantum efficiency were calculated. The maximum emission cross section of YbFGa-0.5 is 1.63 × 10^(-20) cm^2 by 980 nm excitation. The energy transfer efficiency is calculated to be77.8% for the YbFGa-0.5 glass around 2700 nm. The quantum efficiency at 1530 nm is 65.6%. The result reveals that the best doping concentration ratio of Er^(3+):Yb^(3+) ions is 1:0.5, and suggests an effective energy transfer from Yb^(3+) to Er^(3+) ions. | Yapei Peng Xinqiang Yuan Long Zhang Peiguang Yan Wenfei Zhang Shuangchen Ruan | 2019 | Journal of Rare Earths2019，37，5： | 5 |
| 10 | Recent progress report on DNA B-Z transition modulated by rare earth-amino acid complex and Alzheimer's disease amyloid beta显示文摘Rare earth elements have unique physical, magnetic, luminescent and catalytic properties. They have been successfully used as medicine and probes in luminescent resonance energy transfer (LRET) for bioassays, as well as reagents for diagnosis in magnetic resonance imaging (MRI). In this progress report, we will focus on recent progress on how rare earth amino complexes bind to DNA and change DNA structure, especially on DNA B-Z transition induced by rare earth amino acid complex and its potential impact on Alzheimer's disease (AD). | 耿杰 曲晓刚 | 2010 | Journal of Rare Earths2010，28，6： | 5 |
| 11 | Preparation, Structure, Photoluminescence and Energy Transfer Mechanism of a Novel Holmium Complex显示文摘A novel holmium complex [Ho(HIA)_2(H_2O)_4(NO_3)](NO_3)_2(1, HIA = isonicotinic acid) has been synthesized through hydrothermal reactions and characterized by single-crystal X-ray diffraction. Complex 1 crystallizes in the C2/c space group of monoclinic system: a = 14.4797(7), b = 12.4768(2), c = 13.3471(5) ?, β = 118.690(4)°, V = 2115.26(13) ?~3, C_(12)H_(16)HoN_5O_(17), Mr = 667.23, Z = 4, Dc = 2.095 g/cm^3, μ(Mo Kα) = 3.838 mm^(–1) and F(000) = 1304. The crystal structure of 1 is characterized by an isolated structure. Solid-state photoluminescence experiment uncovers that it shows yellow light emission. The emission bands are originated from the characteristic emission of the 4 f electrons intrashell transition of the ~5S_2 → ~5I_8 and ~5F_5 → ~5I_8 of the Ho^(3+) ions. Energy transfer mechanism is explained by the energy level diagram of the Ho3+ ion and the isonicotinic acid ligand. It has remarkable CIE chromaticity coordinates of(0.4929, 0.4632), so it may be a promising color converter for lighting and displays. | 匡汉茂 张转霞 林隆祯 陈华龙 陈文通 | 2019 | Chinese Journal of Structural Chemistry2019，38，3： | 5 |
| 12 | Causes and underlying dynamic processes of the mid-winter suppression in the North Pacific storm track显示文摘Baroclinic wave activity in the North Pacific exhibit peaks in late fall and early spring, and a local minimum in midwinter, when by linear baroclinic instability theory it should attain its maximum. This counterintuitive phenomenon, or'midwinter suppression'(MWM) as called, is investigated with a functional analysis apparatus, multiscale window transform(MWT), and the MWT-based theory of canonical transfer and localized multi-scale energetics analysis, together with a feature tracking technique, using the data from the European Centre for Medium-Range Weather Forecasts ReAnalysis(ERA-40). It is found that the MWM results from a variety of different physical processes, including baroclinic canonical transfer, diabatic effect, energy flux divergence, and frictional dissipation. On one hand, baroclinic canonical transfer and diabatic effect achieve their respective maxima in late fall. More transient available potential energy is produced and then converted to transient kinetic energy, resulting in a stronger storm track in late fall than in midwinter. On the other hand, in early spring, although baroclinic instability and buoyancy conversion are weak, energy flux convergences are substantially strengthened, leading to a net energy inflow into the storm track. Meanwhile, frictional dissipation is greatly reduced in spring; as a result, less transient energy is dissipated in early spring than in midwinter. It is further found that the weakening of baroclinic canonical transfer in midwinter(compared to late fall) is due to the far distance between the storm and the jet stream(located at its southernmost point), which suppresses the interaction between them. Regarding the increase in energy flux convergence in early spring, it appears to originate from the increase(enhancement) in the number(strength) of storms from the upstream into the Pacific. | Yuanbing ZHAO X.San LIANG | 2019 | Science China Earth Sciences2019，62，5： | 4 |
| 13 | Enhancing bioelectricity generation in microbial fuel cells and biophotovoltaics using nanomaterials显示文摘Microbial fuel cells and biophotovoltaics represent promising technologies for green bioelectricity generation.However,these devices suffer from low durability and efficiency that stem from their reliance on living organisms to act as catalysts.Such limitations can be overcome with augmented capabilities enabled by nanotechnology.This review presents an overview of the different nanomaterials used to enhance bioelectricity generation through improved light harvesting,extracellular electron transfer,and anode performance.The implementation of nanomaterials in whole-cell energy devices holds promise in developing bioelectrical devices that are suitable for industry. | Mohammed Mouhib Alessandra Antonucci Melania Reggente Amirmostafa Amirjani Alice J. Gillen Ardemis A.Boghossian | 2019 | Nano Research2019，12，9： | 4 |
| 14 | Spectroscopic investigations on Dy^(3+) ions doped zinc lead alumino borate glasses for photonic device applications显示文摘This paper presents the structural, optical absorption, photoluminescence (PL) and decay spectral properties of Dy^(3+)ions doped zinc lead alumino borate (ZPAB) glasses to elucidate their possible usage in photonic devices such as w-LEDs and lasers. A broad hump shown by the XRD spectrum recorded for an un-doped ZPAB glass confirms its non-crystalline nature. The Judd-Ofelt (J-O) intensity parameter evaluated from the measured oscillator strengths of the absorption spectral features were used to estimate various radiative parameters and also to understand the nature of bonding between Dy^(3+)ions and oxygen ligands. Under 350 nm excitation, the as-prepared glasses are exhibiting two emission bands^4F_(9/2)→~6H_(15/2)(blue),and^4F_(9/2)→~6H_(13/2)(yellow) at 483 and 575 nm,respectively. From the PL spectra,the Y/B ratio values, CIE chromaticity color coordinates and color correlated temperature (CCT) were evaluated. The experimental lifetimes measured from the decay profiles are decreasing with increase in Dy^(3+)ions concentration in these glasses which may be attributed to the cross-relaxation and nonradiative multiphonon relaxation process. Decay profiles observed for higher concentration were well fitted to Inokuti-Hirayama (I-H) model to understand the energy transfer process and subsequent decrease in experimental lifetimes. The higher values of radiative parameters, emission cross-sections,quantum efficiency, optical gain and gain band width suggest the suitability of 0.5 mol%of Dy^(3+) ions in these ZPAB glasses for the photonic device application. | Nisha Deopa Shubham Saini Sumandeep Kaur Aman Prasad A.S.Rao | 2019 | Journal of Rare Earths2019，37，1： | 4 |
| 15 | Targeted energy transfer of a parallel nonlinear energy sink显示文摘A parallel nonlinear energy sink(NES) is proposed and analyzed. The parallel NES is composed of a vibro-impact(VI) NES and a cubic NES. The dynamical equation is given, and the essential analytical investigation is carried out to deal with the cubic nonlinearity and impact nonlinearity. Multiple time-scale expansion is introduced, and the zeroth order is derived to give a rough outline of the system. The underlying Hamilton dynamic equation is given, and then the optimal stiffness is expressed. The clearance is regarded as a critical factor for the VI. Based on the periodical impact treatment by analytical investigation, the relationships of the cubic stiffness, the clearance, and the zeroth-order attenuation amplitude of the linear primary oscillator(LPO) are obtained.A cubic NES under the optimal condition is compared with the parallel NES. Harmonic signals, harmonic signals with noises, and the excitation generated by a second-order?lter are considered as the potential excitation forces on the system. The targeted energy transfer(TET) in the designed parallel NES is shown to be more e?cient. | Yimin WEI Sha WEI Qianlong ZHANG Xinjian DONG Zhike PENG Wenming ZHANG | 2019 | Applied Mathematics and Mechanics(English Edition)2019，40，5： | 4 |
| 16 | Recent Developments in Integrated Solar Combined Cycle Power Plants显示文摘Global concern for depleting fossil fuel reserves have been compelling for evolving power generation options using renewable energy sources. The solar energy happens to be a potential source for running the power plants among renewable energy sources. Integrated Solar Combined Cycle(ISCC) power plants have gained popularity among the thermal power plants. Traditional ISCC power plants use Direct Steam Generation(DSG) approach. However, with the DSG method, the ISCC plant’s overall thermal efficiency does not increase significantly due to variations in the availability of solar energy. Thermal Energy Storage(TES) systems when integrated into the solar cycle can address such issues related to energy efficiency, process flexibility, reducing intermittency during non-solar hours. This review work focuses and discusses the developments in various components of the ISCC system including its major cycles and related parameters. The main focus is on CSP technologies, Heat Transfer Fluid(HTF), and Phase Change Material(PCM) used for thermal energy storage. Further, study includes heat enhancement methods with HTF and latent heat storage system. This study will be beneficial to the power plant professionals intending to modify the solar-based Combined Cycle Power Plant(CCPP) and to retrofit the existing Natural Gas Combined Cycle(NGCC) plant with the advanced solar cycle. | KHANDELWAL Neelam SHARMA Meeta SINGH Onkar SHUKLA Anoop Kumar | 2020 | Journal of Thermal Science2020，29，2： | 4 |
| 17 | Von Willebrand Factor Antigen and ADAMTS13 Activity Assay in Pregnant Women and Severe Preeclamptic Patients显示文摘The present study examined von Willebrand factor (vWF) levels and ADAMTS13 activity in pregnant and severe preeclamptic women in order to shed light on the prothrombotic state in severe preeclampsia.Thirty healthy women of childbearing age,22 second trimester pregnant women,30 third trimester pregnant women and 10 severe preeclamptic patients were recruited in this study.ADAMTS13 activity was determined by the FRETS-vWF73 assay and vWF antigen (vWF:Ag) levels by an enzyme-linked immunosorbent assay.The results showed that there were statistically significant differences in plasma vWF antigen levels between the severe preeclamptic and third trimester pregnant women,between third and second trimester pregnant women (P<0.05).The third trimester pregnant women had significantly lower plasma ADAMTS13 activity than second trimester pregnant women (P<0.05).Nevertheless,no significant differences in plasma ADAMTS13 activity were found between severe preeclamptic patients and the third trimester pregnant women (P>0.05).In conclusion,plasma ADAMTS13 activity is normal in severe preeclampsia despite the increased vWF:Ag levels.Prothrombotic state is involved in the pathogenesis of severe preeclampsia,as a result of endothelial injury. | 张丹丹 肖娟 黄浩梁 陈娟娟 刘涛 尹宗智 高单萍 刘琼 艾继辉 陈素华 | 2010 | Journal of Huazhong University of Science and Technology(Medical Sciences)2010，30，6： | 4 |
| 18 | Upconversion Photoluminescence and Energy Transfer Mechanism of a Novel Terbium-mercury Compound显示文摘A novel terbium-mercury complex [Tb(IA)3(H3 O)2]2 n(2 n HgCl4)(n Hg2 Cl5)·n H3 O· 3 n H2 O(1, HIA = isonicotinic acid) has been synthesized through hydrothermal reactions and characterized by single-crystal X-ray diffraction. Complex 1 crystallizes in the C2/c space group of monoclinic system with a = 24.2347(5), b = 20.8342(6), c = 15.3206(3) ?, β = 128.257(2)°, V = 6074.3(2) ?3, C36H41Cl13Hg4N6O20Tb2, Mr = 2458.80, Z = 4, Dc = 2.689 g/cm3, μ(Mo Kα) = 13.014 mm–1 and F(000) = 4520. The crystal structure of 1 is characterized by a one-dimensional(1-D) chain-like structure. Solid-state UV/Vis diffuse reflectance spectrum reveals the existence of a wide optical band gap of 3.36 eV. Solid-state photoluminescence experiment uncovers that it shows reddish brown upconversion emission. The emission bands are originated from the characteristic emission of the 4 f electrons intrashell transition of the 5D4 → 7 FJ(J = 6, 5, 4) of the Tb3+ ions. Energy transfer mechanism is explained by the energy level diagram of the Tb3+ ion and the isonicotinic acid ligand. It shows a remarkable CIE chromaticity coordinates(0.4158, 0.4005). | 林维晟 匡汉茂 罗辉 陈文通 | 2019 | Chinese Journal of Structural Chemistry2019，38，6： | 3 |
| 19 | Computer Simulation on Kinetics of Primary Process in Photosynthesis (Ⅲ)——Energy Transfer in the Trimers and Hexamers of C-Phycocyanins显示文摘Based on the crystal structure data from X-ray analysis,the energy transfer processes inthe trimers and hexamers of C-phycocyanins(C-PC)have been simulated.The simulation results show(i)The excitation energy could transfer back and forth many times through a certain path before it was finallylost through fluorescence emission.(ii)The higher the aggregate,the less the transfer times.(iii)In atrimer,an m-(mediate)chromophore in a monomer and an f-(fluorescing)chromophore in another are inclosest proximity to each other and an appropriate orientation.These two chromophores form a fast transferpair with their energy transfer proceeding so fast that the time constant is less than 1 ps.There are 3 suchfast transfer pairs which are symmetrically equivalent in a trimer,while the paths of m■f and f■f betweenthe monomers are responsible for linking the fast transfer pairs.(iv)The excitation energy on an s-(sensi-tizing)chromophore is dominantly transferred to the f-chromophore in the same monomer.(v)In the hex-amer,there are 2 types of principal paths for linking the 2 trimers,which are m■m and s■s paths,whilethe excitation energy on the f-chromophores will be transferred into another trimer through the m-chro-mophore in the same fast transfer pair.The simulation shows that the hexamer possesses an optimal struc-ture for energy transfer. | 赵井泉 朱晋昌 蒋丽金 | 1994 | Science China Chemistry1994，37，11： | 3 |
| 20 | Chemiluminescence behavior of sodium hydrogen carbonate in the potassium permanganate-hydrogen peroxide reaction显示文摘Chemiluminescence (CL) phenomenon of hydrogen peroxide with potassium permanganate in the presence of sodium hydrogen carbonate was reported.Effects of the surfactant on the CL system were investigated.Nonionic surfactants could effectively increase the CL signal.Radical scavengers and organic reagents such as nitro blue tetrazolium chloride (NBT),cytochrome c,sodium azide,ascorbic acid,thiourea,tert-butanol and dimethyl sulphoxide were used to study the emitting species.CL emission spectrum was recorded and the results showed that the maximal emission wavelengths of NaHCO3-H2O2-KMnO4 system were 440 and 634 nm.The mechanism was discussed based on electron spin resonance (ESR) spectra,fluorescence spectra and UV-vis absorption spectra.The addition of rhodamine B or uranine into this CL system enhanced the CL signal.It was due to part of the energy transfer from singlet oxygen and excited triplet dimers of two CO2 molecules to rhodamine B or uranine.The CL could be induced by excited rhodamine B or uranine. | CHEN Hui1,2,LU Chao1,LI RuiBo1,GUO GuangSheng1 & LIN Jin-Ming2 1State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology,Beijing 100029,China 2Department of Chemistry,Tsinghua University,Beijing 100084,China | 2010 | Science China Chemistry2010，53，8： | 3 |
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