A New Yellow Long Lasting Phosphor Y_2O_2S∶Ti

Longphosphorescencephosphorshaveattractedconsiderableattentioninrecenthalf century[1] becauseoftheirpotentialapplicationsinsuchfieldsaslumi nouspaint ,safetyindicatorinemergencycase ,etc[2～ 4 ] .Sincethediscoveryofalkali earthaluminatelonglastingphosphorsin 1996 [1] ,theyhavebeenstudiedextensivelyastheyhavebetterstabilityandlongerpersistenttimethanthesulfidephosphorswhichwerewidelyusedinmanycases .Uptonow ,poly crystallinephosphorsofblueCaAl2 O4 ∶ (Eu2 ,Nd3 ) ,greenSrAl2 O4 ∶(Eu2 ,…     

Study on Spectra of La_2CaB_(10)O_(19)∶Eu~(3 ) in VUV-VIS Range

Manyboratesareexcellenthostsforrareearthlu minescence ,forexample ,nowbestredphosphorinplasmadisplaypanel (PDP )is (Y1-xGdx)BO3∶Eu[1] .Boratephosphorsdopedwithrareearthionshavebeenrichlystudiedinthepastfewdecades[2 ,3] .RecentlyWuYichengetal .[4 ] synthesizedanewbo rateLa2 CaB10 O19,whichispotentialnonlinearopticalmaterials.InthisworkweselectedLa2 CaB10 O19ashostofluminescencematerialsbecauseitprobablyisabetterhostforrareearthluminescence .Duetotherequirementofplasmadisplaypenal(PDP)…     

Effect of TSL and PSL in Al~(3+)-Doped BaFBr∶Eu~(2+) at Difference Synthesis Conditions

BaFBr∶Eu2 +,asphoto gatedholeburningmateri al[1] ,scintillatorcrystallinematerialandX rayimagestoragematerial ,iscalledphotostimulatedluminescence(PSL)material[2 ] .Theimagingplate (IP)madeofthesephosphorsisnowusedwidelyasdisplayoftwo dimen sionalimagescausedbyionizationradiation[3] .Thecommercialapplicationofthesematerialsbe ganin 1983.Becauseofapplicationofthesephospho rs ,theconventionalX rayfilmmaybereplacedbythescreenmadeofPSLphosphors (alsocalledimagingplate ,IP) [4 ] .IPhasnotab…     

Polynuclear Lanthanoid Complexes Containing Aluminium—The Structure of[HoAl(CF_3COO)_2(CF_3CHOO)(C_2H_5)_2(C_4H_8O)_2]_2 at 233K

[HoAl(CF_3COO)_2(CF_3CHOO)(C_2H_5)_2(C_4H_8O)_2]_2,Mr=1468.7,monoclinic,P 2_1/n,a=1.0084(4),b=1.8453(6),c=1.4501(6)nm,β=102.40(3)°,V=2.6355(1)nm~3,Z=2,D_c=1.81gcm~(-3),F(000)=1511,T=233K,Mo Kα radiation(λ=0.071069nm).R=0.052 for 6176 unique reflections[Ⅰ≥36(Ⅰ)].The structuralunits consist of dimeric molecules with the mixed ligand and central bimetallic atoms,which are polynuclearlanthanoid complexes containing aluminium.Ho-Ho'distance is 0.3619(1)nm.The coordination polyhedron ofHo can be described in terms of a distored bicap-prism.     

Synthesis and crystal structure of a 1D chainlike rare earth coordinated tungstogermenate： [（CH3）4N]1.50H3.50[Gd（GeW11O39）（H2O）2]·2.5H2O

A 1D zigzag polyoxometalate [(CH3)4N]1.50H3.50[Gd(GeW11O39)(H2O)2]·2.5H2O(1) was synthesized by reaction of the monova-cant polyanion [α-GeW11O39]8- with Gd3+ ions in aqueous solution and characterized by IR, UV spectra, ICP, and X-ray crystallography. X-ray single-crystal structural analysis indicated that the title compound crystallized in a monoclinic lattice, C2/c space group with α=2.8201(5), b=2.2885(3), c=2.4033(4) nm,β=123.875 (2)°, V=12.878(4) nm3, Z=8, R1=0.0623, wR2=0.1287. The solid-state structure of the title compound displayed an infinite one-dimensional arrangement built up of [α-GeW11O39]8- polyanions connected by GdⅢ cations.     

Effect of Sr^2＋ on Properties of Li0.2375＋xLa0.5875-xSrxTiO3-LaPO4 System

Ionicconductingsolidmaterialshavereceivedconsiderableattentioninthelastfewyearsduetotheirpotentialutilityinhighenergybatteriesandotherelec trochemicaldevices .SeveralsystemsoflithiumfastionconductorsareknowntoshowhighlithiumionconductivitysuchasγLi3PO4 typesolidsolution[1] ,LiTi2 (PO4 ) 3anditsderivations[2～4 ] andLi14 Zn(GeO4 ) 3solidsolution[5] .However ,exceptforlowpowerapplications ,onemajorproblemwiththepracticalapplicationsisitslowconductivityatroomtemperature .Recentyears ,morean…     

Ce_xTi_(1-x)O_2 Mixed Oxides Supported CuO Catalyst for NO Reduction by CO

Uptodate ,numerousstudieshaveshownthatrareearthoxidesaretheexcellentstructuralandelec tronicpromoterstoimprovetheactivity ,selectivityandthermalstabilityofcatalysts[1,2 ] .Themostwidelyappliedrareearthoxideinindustrialcatalysisiscer tainlyCeO2 .However ,amajordrawbackofCeO2 isthelossofoxygenstoragecapability (OSC)duetoitssinteringathighertemperature (>75 0℃ ) ,whichleadstothedeactivationofthecatalyst[3 ,4] .Oneap proachpreviouslyusedtostabilizeceriaagainstsinter ingwastodopeitwithotheranti…     

SrAl_2O_4∶Eu~(2+),Nd~(3+) and Dy~(3+) Long Afterglow Phosphor

Longafterglowphosphorabsorbingenergyfromsolar,lampandotherlightsourcesforashorttimestorestheenergyandexhibitsbrightandlong lastingphosphorescencewhichsuitsthevisualperceptionofthehumaneyewithminimumbrightness 0 32mcd·m- 2 andlastingtimemorethan 8h) .TheSrAl2 O4 ∶Eu2 +,Dy3+phosphorhasbeenknowntobeagreenlongafterglowphosphorwithanemissionpeakat 5 2 0nm[1～ 7] .ThepropertiesofthephosphorwerefurtherexaminedbythegroupofTangMingdaoandMatsuzawaTindetailin 1995and 1996respectively[1,2 ] .Inorde…     

Luminescence Properties of (Y, Gd)Al_3(BO_3)_4∶Eu ~(3 ) under VUV excitation

Thephosphorsasanimportantpartofplasmadis playpanel (PDP)deviceemitvisiblelightundervac uumultraviolet (VUV)excitationof 14 7nmand/or172nmfromXe/Hegasplasma[1] .Untilrecently ,Y2 O3∶Eu3 and (Y ,Gd)BO3∶Eu3 havebeenusedascommercialred emittingphosphorsforPDP[2 - 3] .Butthesematerialsstillhaveshortcomingstobeim proved :lowlightoutputofY2 O3∶Eu3 uponVUVex citationandbadcolorpurityof (Y ,Gd )BO3∶Eu3 [4～ 5] .AluminoborateshavestrongabsorptionintheVUVregion ,andexhibitexcellentma…     

Study on Luminescence Properties and Crystal-Lattice Environment of Eu~(2 ) in Sr_(4-x)Mg_x Si_3O_8Cl_4∶Eu~(2 ) Phosphor

ChlorosilicatecrystalmaterialM4 Si3O8Cl4 (M =Ba ,Sr ,Ca)isasuitablehostlatticeforluminescencematerials .Adivalenteuropiumactivatedstrontiumchlorosilicatephosphorisakindofgoodblue greenemissionphotoluminescencematerialunderUVexcita tion .Itsluminescencepropertiesandcrystalstructurehavebeenintensivelystudied[1～4 ] .Inthechlorosili catehost ,theluminescenceofEu2 consistsofa4f6 5d1- 4f7(8S7/2 )broad bandemission ,whichbe longstoelectric dipoleallowedtransitionandhasthepropertiesoflargeabso…     

Mg(Ⅱ)-Ca(Ⅱ)-NH3-CO2-3-SO2-4-H2O体系钙镁溶解热力学分析

根据同时平衡原理,分析了Mg(Ⅱ)-Ca(Ⅱ)-NH3-CO2-3-SO2-4-H2O体系的热力学,揭示了该体系钙、镁的溶解规律.该体系中存在着钙、镁的高溶解度区域,而且钙的溶解度随碳酸根总浓度(CT)的增加而增加,在CT>0.1 mol/L时随[SO2-4]的增加而增加,同时也随总氨浓度,即[NH3]+[NH+4](AT)和pH的增加而减小;镁的溶解度随[SO2-4]的增加而增加,随CT和AT的增加先降低后增加,随pH的增大而减小.这对于碳酸钙、碳酸镁及氧化镁产品和对钙镁含量要求严格的其它金属碳酸盐产品的制备具有重要的指导意义.     

Ni-NH_3-H_2O-SO_4~(2-)体系的热力学平衡

根据热力学数据,考虑到活度的影响,对Ni-NH_3-H_2O-SO_4~(2-)体系的[Ni~(2+)]T进行理论计算,得到[Ni~(2+)]T与a(OH-)、[NH3]和[SO_4~(2-)]的关系式,并采用MATLAB由[Ni~(2+)]T试验值求出系数。结果表明:Ni-NH_3-H_2O-SO_4~(2-)体系中,[Ni~(2+)]T随pH增大而减小;低浓度NH3对[Ni~(2+)]T几乎无影响,高浓度SO_4~(2-)使[Ni~(2+)]T增大。了解这些关系对含镍废水的处理有一定指导意义。     

Conductivity of K_(10)H_3[Dy(SiW_4Mo_7O_(39))_2] Treated by Chemistry-Heated Diffusion of Sm and Gd Permeation

Inthelastfewyears ,theapplicationsofpolyox ometalates (POMs)havereceivedmuchattention[1～ 3]fortheiruniquestructuresandproperties ,however ,thepreparationofthemareallofsolid solidorliquid liquidreactions[1] .Fromtheknowledgeoffundamen taltheory ,wethinkthatrareearthelementscanbepermeatedintoPMOsthroughthesolid gasinterfacereaction ,andtoourknowledgethiskindofexperi menthasnotbeencarriedoutuntilnow .Inthispaper ,thechemistry heateddiffusedperme ationmethod[4 ] wasusedtotreatK10 H3[Dy(SiW4 M…     

两种丙烯酸盐[Ln2(CH2CHCOO)6·3H2O]·3H2O(Ln=Ce;Nd)的单晶结构

采用X射线单晶衍射法,解析了[Ln2(CH:CHCOO)6·3H2O]·3H2O(Ln=Ce;Nd)的结构.结果表明标题化合物属同构:属单斜晶系(空间群P2(1)/c);[Ce2(CH2CHCOO)6·3H2O]·3H2O晶胞参数α=1.02099(13)nm,b=1.52294(19)nm,c=2.0325(3)nin,/3=100.838(2)°,V=3.1039(7)nm3;[Nd2(CH2CHCOO)6·3H2O]·3H2O晶胞参数α=1.01978(8)nm,6=1.50979(12)nm,c=2.02712(16)nm,β=100.881(1)°,V=3.0650(4)nm3.化合物不对称结构单元中含有两个独立的稀土中心离子,分别处九、十配位环境中.两个稀土离子由两个独立的丙烯酸μ2-氧桥联形成左手和右手螺旋链.螺旋链通过链间的水分子形成氢键网络,堆垛成三维结构.     

合成恩替卡韦重要中间体工艺的优化

以(1S,2R)-2-[(苄氧基)甲基]-3-环戊烯-1-醇为起始原料,经环氧化、上苄基保护基、环氧开环、上4-对甲氧基苯基二苯基(MMT)保护、Dess-Martin氧化反应得到中间体(2R,3s,5S)-5-[2-[[(4-甲氧基苯基)二苯甲基]氨基]_6-苄氧基-9H-嘌呤-9-基]-3-苄氧基-2-[(苄氧基)甲基]环戊酮.产物结构经氢谱测试确证.与文献报导相比.该工艺操作简便.适宜放大生产.     

Preparation and Luminescence Properties of the New Long Phosphorescent Phosphors Ba_(1-x)Ca_xAl_2O_4∶Eu ~(2 ), Dy~(3 )

Inrecentyears ,SrAl2 O4 ∶Eu2 ,Dy3 ,CaAl2 O4 ∶Eu2 ,Nd3 [1～ 8] andBaAl2 O4 ∶Eu2 ,Dy3 [9]havebeenconsideredasusefulblueandgreenphos phorsbytheirlongdurationphosphorescence .Howev er ,toourknowledge ,thephosphorBa1-xCaxAl2 O4 ∶Eu2 ,Dy3 hasnotbeeninvestigated .TheluminescenceofEu2 isverystronglydepen dentonthehostlattice ,whichcanoccurfromtheul traviolettotheredregionoftheelectromagneticspec trum .Itiswellknownthatthepersistentluminescenceisduetothetrappingofenergyinthed…     

A new polyoxometalate based on mono-lacunary Dawson polyoxoanion:molecular structure of [{Nd(H2O)3(α2-P2W17O61)}2]14-

A new polyoxometalate dimer based on lacunary Wells-Dawson anion and lanthanide cation, Na14[{Nd(H2O)3 (α2-P2W17O61)}2]·17H2O, was isolated as a sodium salt under ambient conditions and characterized by IR, TG, and X-ray single crystal structure analysis and electrochemistry. It belonged to the triclinic, space group Pī with a=1.26738 (15) nm, b=1.41464 (17) nm, c=2.3254 (4) nm, α=103.142 (2)°, β = 95.122 (2)°, γ=113.9690 (10)°, V=3.6317 (8)nm3, Z=2, Dc=4.274 mg/m3, and μ=27.695 mm-1. The Nd3 ion was substituted for a [W=O]4 unit in the "cap" site of the tungsten-oxygen framework of the parent Wells-Dawson ion. The cyclic voltammograms of the title compound exhibited nearly chemically reversible one-step one-electron transfer process and two-step irreversible reduction processes. Thermogravimetric showed a one-step slow weight loss stage in the range of 25-850 ℃.     

[Ni(2,2′-bpy)2(H2O)]2[PMoⅥ7MoⅤ5VⅣ2O42]的水热合成与晶体结构

用磷钼酸做原料,在水热条件下合成了一种新的二帽二支撑的Keggin型多金属氧酸盐[Ni(2,2′-bpy)2(H2O)]2[PMoⅥ7 MoⅤ5 VⅣ2 O42],并通过元素分析、红外光谱、热重分析和X射线单晶衍射方法确定了该化合物的晶体结构.结构分析表明:该化合物属于三斜晶系,Pi空间群;晶胞参数a＝1.186 6(2)nm,b=1.242 3(3)nm,c=1.257 4(3)nm,α=71.10(3)°,β=74.38(3)°,γ=87.43(3)°,V=1.687 0(6)nm3,Z=1,R1=0.058 0,wR2=0.156 8.     

碳酸盐前驱体和CS_2硫化制备SrY_2S_4∶Eu~(2+)红色荧光粉及其表征

以Sr2+,Y3+和Eu3+的混合硝酸盐溶液为阳离子溶液,以(NH4)2CO3为沉淀剂,共沉淀法制备了碳酸盐前驱体,TG-DSC分析结果表明,随着(NH4)2CO3浓度的升高,前驱体组成由碱式碳酸盐向正盐转变。以CS2为硫化剂,高温煅烧前驱体合成了SrY2S4∶Eu2+红色荧光粉。XRD表明前驱体经800℃处理得到纯相SrY2S4。荧光光谱和SEM研究表明在[Sr(NO3)2+Eu(NO3)3]∶[Y(NO3)3]∶[(NH4)2CO3]=0.25∶0.50∶2.00(摩尔比)条件下制备前驱体,然后1050℃煅烧4 h所得荧光粉的发光强度最大,粒径小于1μm,粒子形貌呈椭球。Eu2+在SrY2S4基质中的最佳掺杂摩尔分数是0.6%。     

Mg(Ⅱ)-Ca(Ⅱ)-NH_3CO_3~(2-)SO_4~(2-)H_2O体系钙镁溶解热力学分析

根据同时平衡原理,分析了Mg(Ⅱ) Ca(Ⅱ) NH3 CO2-3 SO2-4 H2O体系的热力学,揭示了该体系钙、镁的溶解规律。该体系中存在着钙、镁的高溶解度区域,而且钙的溶解度随碳酸根总浓度(CT)的增加而增加,在CT>0.1 mol/L时随[SO2-4 ]的增加而增加,同时也随总氨浓度,即[NH3]+[NH+4 ](AT )和 pH的增加而减小;镁的溶解度随[SO2-4 ]的增加而增加,随CT和AT 的增加先降低后增加,随 pH的增大而减小。这对于碳酸钙、碳酸镁及氧化镁产品和对钙镁含量要求严格的其它金属碳酸盐产品的制备具有重要的指导意义。