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fluorescence properties and Chemical Composition of Fine Particles in the Background Atmosphere of North China

Advances in Atmospheric Sciences 2023年第7期40卷 1159-1174页

作者： Ping LI Siyao YUE Xiaoyang YANG Di LIU Qiang ZHANG Wei HU Shengjie HOU Wanyu ZHAO Hong REN Gang LI Yuanguan GAO Junjun DENG Qiaorong XIE Yele SUN Zifa WANG Pingqing FU State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China Institute of Surface-Earth System Science School of Earth System ScienceTianjin UniversityTianjin 300072China University of Chinese Academy of Sciences Beijing 100049China

To understand the aerosol characteristics in a regional background environment,fine-particle(PM_(2.5),n=228)samples were collected over a one-year period at the Shangdianzi(SDZ)station,which is a Global Atmospheric Watch regional background station in North *** chemical and optical characteristics of PM_(2.5)were analyzed,including organic carbon,elemental carbon,water-soluble organic carbon,water-soluble inorganic ions,and fluorescent components of watersoluble organic *** source factors of major aerosol components are apportioned,and the sources of the fluorescent chromophores are further *** major chemical components of PM_(2.5)at SDZ were NO_(3)^(-),organic matter,SO_(4)^(2-),and NH_(4)^(+).Annually,water-soluble organic carbon contributed 48%±15%to the total organic *** formation(52%)and fossil fuel combustion(63%)are the largest sources of water-soluble organic matter and water-insoluble organic matter,*** addition,three humic-like and one protein-like matter were identified via parallel factor analysis for excitation–emission *** fluorescence intensities of the components were highest in winter and lowest in summer,indicating the main impact of burning *** study contributes to understanding the chemical and optical characteristics of ambient aerosols in the background atmosphere.

关键词： fine aerosols excitation-emission matrix fluorescence properties primary biological aerosols Shangdianzi

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Spectroscopic and fluorescence properties of Sm^(3+)-doped zincfluorophosphate glasses

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Journal of Rare Earths 2014年第10期32卷 918-926页

作者： V.B.Sreedhar Ch.Basavapoornima C.K.Jayasankar Department of Physics Sri Venkateswara University Department of Physics National Degree and P.G. College

Optical absorption and fluorescence spectra of Sm3＋-doped zincfluorophosphate glasses with molar composition of 44P2O5＋17K20＋9Al2O3＋（30-χ）ZnF2＋χSm2O3 （χ=0.01 mol.%, 0.05 mol.%, 0.1 mol.%, 0.5 mol.%, 1.0 mol.%, 2.0 and 3.0 mol.%） referred as PKAZFSm were prepared by melt quenching technique and were characterized through Raman, absorption, emission and decay curve analysis. From the absorption spectra, Judd-Ofelt intensity parameters were determined and were used to predict radiative properties such as transition probabilities （AR, radiative lifetimes （τR）, branching ratios （βR）, effective bandwidths （△λeff） and stimulated emission cross-section （σ（λp）） for the excited 4G5/2 luminescent level. The decay curve for the 4G5/2 level was single exponential for lower concentration and became non-exponential for higher concentrations. The non-exponential nature of the decay curves of the 4G5/2 level increased with increase in Sm3＋ ions concentration accompanied by decrease in lifetime due to energy transfer processes among the Sm3＋ ions. The non-exponential decay curves was well fitted to the generalized Inokuti-Hirayama model for S=6, indicating that the energy transfer among optically active ions was of dipole-dipole interaction. The cross-relaxation mechanism responsible for the quenching of lifetimes and the effect of variation of concentration on the spectroscopic properties were also discussed.

关键词： zincfluorophosphate glasses samarium Raman spectrum optical properties fluorescence properties rare earths

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Syntheses, characteristics, and fluorescence properties of complexes of europium with benzoic acid and its derivatives

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Rare Metals 2004年第4期23卷 306-310页

作者： ZHOUZhongcheng SHUWangen RUANJianming HUANGBoyun LIUYounian StareKeyLaboratotyforPowerMetallurgy CentralSouthUniversityChangsha410083China CollegeofChemistryandChemicalengineering CentralSouthUniversityChangsha410083China

The binary complexes of europium with benzoic acid and its derivatives(phthalic acid, m-phthalic acid, o-aminobenzoic acid, salicylic acid, and sulfosalicylic acid) weresynthesized and their compositions were identified by elemental analyses. UV and IR of the complexeshave been investigated. The UV spectra indicated that the complexes' ultraviolet absorption weremainly the ligands' absorption. The IR spectra showed that the IR spectra of complexes are differentfrom those of free ligands. The fluorescence properties of them were investigated by usingluminescence spectroscopy, the results showed that only three complexes appear as betterluminescence, they were Eu-benzoic acid, Eu-m-phthalic acid and Eu-phthalic acid, while the othersexhibited the ligands' wideband emission.

关键词： function materials rare earth complexes luminescence spectroscopy benzoicacid fluorescence properties

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Synthesis and fluorescence properties of Y_2O_3:Eu by molten salt synthesis method

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Journal of Rare Earths 2010年第5期28卷 688-692页

作者：吴晓勇梁玉军刘明宇陈蕊李永周 Engineering Research Center of Nano-Geomaterials of Ministry of Education University of Geosciences Faculty of Materials Science and Chemical Engineering China University of Geosciences

Red phosphors Y2O3:Eu were synthesized via molten salt synthesis method with the eutectic mixtures of KNO3-NaNO3 or KCl-NaCl as the fluxes. The as-prepared samples were investigated by means of X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and fluorescence spectrophotometer. The results showed that as-synthesized phosphors had good cubic crystallinity and the effect of annealing temperature on crystallinity was significant. Furthermore, different special morphologies of products were ob...

关键词： phosphor crystal structure fluorescence properties rare earths

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Synthesis,Crystal Structure,fluorescence properties and Geometrical Calculation of 4,8,10-Trimethyl-2-(3,5-dimethylpyrazol)-pyrido-[2',3':3,4]-pyrazol[1,5-a]-pyrimidin

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Chinese Journal of Structural Chemistry 2010年第6期29卷 879-884页

作者：张珊珊尹显洪刁开胜胡飞龙庄玥 College of Chemistry and Ecological Engineering Guangxi University for Nationalities

A novel compound 4,8,10-trimethyl-2-（3,5-dimethylpyrazol）-pyrido-[2＇,3＇：3,4]-py-razol-[1,5-5-a]-pyrimidine（C17H18N6） has been synthesized from 2,6-dichloro-4-methylnico-tino-nitrile,hydrazine and acetylacetone by substitution and *** structure was charac-terized by elemental analysis,1H NMR and IR,and single-crystal structure was determined by X-ray diffraction *** compound crystallizes in the monoclinic system,space group P21/c with a = 8.0338（9）,b = 28.618（3）,c = 7.2688（8）,β = 111.051（2）o,V = 1559.6（3） 3,Z = 4,Dc = 1.305 g/cm3,μ = 0.083 mm-1,Mr = 306.37,F（000） = 648,S = 0.971,the final R = 0.0795 and wR = 0.1746 for 1457 observed reflections（Ⅰ 〉 2σ（Ⅰ））.The results demonstrate that the pyridine,pyrazole and pyrimidine rings are nearly coplanar,which is evident from the dihedral angles among the four rings in the range of 0.13～*** face-to-face π-π stacking interactions among pyridine,pyrazol and pyrimidine rings result in a supramolecular crystal,in which they seem to be effective in stabilizing the ***,the fluorescence properties of the title compound were discussed,which showed very strong *** calculated results（selected bond lengths,bond angles and torsion angles） are all typical and agree well with the experimental results,which demonstrates that B3LYP/6-31＋G＊ is suitable for the title compound.

关键词： pyrido-[2' 3':3 4]-pyrazol[1 5-a]-pyrimidine synthesis crystal structure fluorescence properties

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Synthesis,Structural Characterization,fluorescence properties and Herbicidal Activity of Bis(substituted salicylaldehyde)Carbohydrazide Dibutyltin Complexes

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Chinese Journal of Structural Chemistry 2021年第12期40卷 1639-1646,1553页

作者： FENG Yong-Lan JIANG Wu-Jiu ZHANG Fu-Xing KUANG Dai-Zhi Key Laboratory of Functional Metal-organic Compounds of Hunan Province Key Laboratory of Functional Organometallic Materials of College of Hunan ProvinceDepartment of Chemistry and Material ScienceHengyang Normal UniversityHengyangHunan 421008China

A series of dibutyltin complexes,(Bu_(2)Sn)_(2)L,[(Bu_(2)Sn)_(2)L]3 and H_(2)LSnBu_(2),were synthesized by microwave-assisted methanolic solvothermal method,where H4L is[_(2)-(OH)-R-ArCH=NNH]_(2)CX,and X=O,R=4-NEt_(2)(Tl),5-Br(T_(2));X=S,R=H(T3);R=5-Br(T4).Their structures were characterized by elemental analysis,IR and(^(1)H,^(13)C)-NMR *** molecular structure of T_(2) was confirmed by X-ray *** crystal of T_(2) belongs to monoclinic system,space group ***-coordinated distorted triangular bipyramids and six-coordinated distorted octahedral configurations were formed by the coordination of oxygen and nitrogen atoms of ligand with two dibutyltins,thus forming a trimeric hexanuclear butyltin complex by the cross coordination of three units(Bu_(2)Sn)_(2)L with enol *** T_(2) and T4 exhibit fluorescence emission in DMF solvents and DMF-water *** fluorescence intensity of T_(2)-DMF-H_(2)0 system decreases almost linearly with the increase of water volume fraction(WVF).The aggregation fluorescence enhancement effect of T4-DMF-H_(2)0 solution system increases with the increase of WVF at the range of 0-_(2)0%*** WVF is more than _(2)0%,the fluorescence intensity decreases with the increase of *** addition,T1〜T4 have broad growth activities on target plants,such as Portulaca oleracea L.,Amaranthus spinosus L.,Cassia tora L.,Brassica campestris *** *** Tsen et Lee,and Amaranthus tricolor L.,and can be used as a candidate herbicide for further research.

关键词： bis(substituted salicylaldehyde)carbohydrazide dibutyltin fluorescence properties herbicidal activity

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Effects of Y(Ⅲ) Ions on the fluorescence properties of Ce(Ⅲ) Ion and the Organic Ligands in the Complex

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Chemical Research in Chinese Universities 1997年第3期13卷 189-194页

作者： LI Wen-lian. (Changchun Institute of Physics and the Excited State Process Laboratory, Chinese Academy of Sciences , Changchun , 1 30021 ) Takayuku Mishima , Gin-Ya Adachi and Jiro Shiokawa (Department of Applied Chemistry, Faculty of Engineering,

The enhancement effects of Y ( Ⅲ) ions on the fluorescence of Ce ( Ⅲ) in Ce ( Ⅲ)-Y ( Ⅲ)-PMMA (polymethylmethacrylate ) or Ce ( Ⅲ)-Y ( Ⅲ)-PVC (polyvinyl chloride ) complex systems were observed. The influence of Y ( Ⅲ) ions on the emission spectra of PMMA ligands in PMMA-Y ( Ⅲ) and the fluorescent enhance- ment of Y( Ⅲ) on Ce( Ⅲ) emission in PMMA-Ce-Y by Y( Ⅲ) ion were studied. It was also of interest to note that when Y ( Ⅲ) ions were added into PMMA and into bpy(bipyridine ) , respectively , the emission spectrum of PMMA ligands was split into fine structure bands by Y ( Ⅲ) , and the fluorescence intensities of bpy ligands in bpy-Y ( Ⅲ) complexes were considerably increased.

关键词： Effect fluorescence properties Organic ligand Complex

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Preparation and fluorescence properties of Co-doped Nanocomposite Film Based on Supra Molecular Structure

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Chinese Journal of Chemical Physics 2006年第2期19卷 183-186页

作者：李贵安李貅宋建平李发荣马少华张玉荣方晓玲西安交通大学电子与信息工程学院西安710049 陕西师范大学物理学与信息技术学院西安710062

A novel materials design procedure based on the co-doping of metal nanoparticle and azo dye compound （MNPADC） is developed to improve the properties of functional molecules. The synthesized materials were characterized by transmission electron micrograph （TEM）, ultraviolet-visible absorption spectra （UV-Vis） and fluorescence spectra （FS）. It was found that the fluorescence intensity of methyl orange （MO） was enhanced by 5 times in the aqueous composite system doped with silver nanoparticles whereas it was reduced by 15% and 20% in composite films with co-mixing and coating structures, respectively. The results indicate that the properties of functional molecules can be greatly improved in composite film with supra molecular structure and that the procedure presented here is effective.

关键词： Supra molecular structure Nanocomposite film Silver nanoparticles Methyl orange fluorescence properties

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Synthesis of Chrysenopyrazoles and fluorescence properties

Synthesis of Chrysenopyrazoles and Fluorescence Properties

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中国化学会第十八届全国有机分析及生物分析学术研讨会

作者： Chenchen Li Zunting Zhang Zhang Jin Longzhu Liu Tuo Ma Key Laboratory of the Ministry of Education for Medicinal Resources and Natural Pharmaceutical Chemistry National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest of China and School of Chemistry and School of Chemistry and Chemical Engineering Shaanxi Normal University

Chrysenopyrazoles were synthesized from o-hydroxyacetophenones and aryl halides via four steps. Intermediate 3-phenyl-4-arylpyrazoles were obtained in good yields. Irradiating 3-phenyl-4-arylpyrazoles, dehydration product chrysenopyrazoles and dehydrogenation product hydroxy-chrysenopyrazoles were obtained in the meantime. The fluorescence properties of chrysenopyrazoles were determined, and hydroxy-chrysenopyrazolesemit yellowish-green light in alkalinity due to excited-state intramolecular proton transfer（ESIPT）.

关键词： Chrysenopyrazoles ESIPT dehydration dehydrogenation fluorescence properties

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Synthesis and fluorescence properties of some new difluoroboron β-diketonate complexes

Synthesis and fluorescence properties of some new difluorobo...

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中国晶体学会第六届学术年会暨会员代表大会（功能分子晶体分会）

作者： Dong Ye Xing Zhi Zhong Sun Yan Jun Hou School of Chemistry and Materials Science Heilongjiang University

Organoboron compounds have wide range applications in catalysis,optoelectronic devices,sensors,and probes in the past few years.A series of novel difluoroboron β-diketonate complexes,containing the β-diketonate ligand bearing methyl or methoxyl substituents in position 6 or 5,6 of the ligand,respectively,have been *** crystal structure of the complexes has been *** complexes 2b showed highest fluorescence intensity when compared to other complexes in solution(concentration 10-5M in DCM).But in the solid state,complexes 2c and 2d showed higher fluorescence *** of ompounds 2c and 2d are of both fundamental and practical interest,particularly applications where diluted solutions cannot be used,such as in OLEDs or solar cells.

关键词： X-ray structures of BF2bdks fluorescence properties Synthesis and characterization

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