简介：Thethermalbehavior,mechanismandkineticparametersoftheexothermicfirst-stagedecompositionofthetitlecompoundinatemperature-programmedmodewereinvestigatedbymeansofDSC,TG-DTGandIR.Thereactionmechanismwasproposed.Thekineticmodelfunctionindifferentialform,apparentactivationenergy(Ea)andpre-exponentialfactor(A)ofthisreactionare(3/2)(1-a)[-In(1-a)]^1/3,185.52kJ/moland10^17.78s^-1,respectively.Thecriticaltemperatureofthethermalexplosionofthecompoundis201.30℃.Thevaluesof△S^≠,△H^≠and△G^≠ofthisreactionare72.46J/(mol·K),175.1kJ/moland141.50kJ/mol,respectively.
简介：Anewapproachtothesynthesisof2,2″-biflavanonesbythereductivedimerizationoffla-vonesisreported.Theproducts,theracemateandmesobiflavanones,havebeenseparatedandtheirstructureshavebeendeterminedonthebasisoftheirspectraldata.Theconfigurationof3bhasbeendeterminedbyX-raycrystallographyaswell.
简介：Anewcompoundbasedonpolyoxovanadate[{Ni(en)2}2Sb8V14O42]·5.5H2O(en=ethylenediamine)(1)wassynthesisedhydrothermallyasblackrhombuscrystals.Compound1crystallizedinthemonoclinicsystemwithspacegroupP21/n,Z=4,a=1.46953(9)nm,b=1.28623(8)nm,c=1.76008(11)nm,β=105.7230(10)°.Intheasymmetricunit,cluster{Sb8V14O42}canbeconsideredasanSbderivativeofthe{V18O42}unit.Each{Sb8V14O42}clusterasabuildingblockinterconnectedtofourotherneighboringunitsby{Ni(en)2}bridginggroupswhicharelinkedthroughtheterminaloxygenatomsofthepolyoxoanions,formingatwodimensionalnetwork.
简介：Themonomericcobalt-phosphite-thiolatocomplex[Co(mpt)2{P(OCH3)3}2]BF4(Hmpt=2-mercaptothiazoline)hasbeenpreparedandcharacterizedbyX-raycrystallography.ThecomplexcrystallizesinthemonoclinicspacegroupC2/cwitha=0.8078(5),b=2.6020(18),c=1.2191(7)nm,β=99.38(1)°,V=2.528(3)nm3,andZ=4.Thestructurecomprisesdiscretecations[Co(mpt)2{P(OCH3)3}2.]+andanionsBF4-,inwhichthecobalt(Ⅲ)atomiscoordinatedtotwochelatempt-andtwoas-orientedmonodentateP(OCH3)3ligandsinahighlydistortedoctahedralgeometry.ThemostdistortedanglesareS(2)-Co(1)-S(2a)of162.23(10)°andN(1)-Co(1)-S(2)of71.47(13)°,thelatteriscausedbythegeometricconstraintofthebidentateligandmpt-.CyclicvoltammetryhasbeenusedtostudytheelectrochemicalbehaviorofthetitlecomplexontheRelectrodeinMeCNsolutionwith0.1mol·L-1ofBun4NBF4aselectrolyte.TheresultsindicatethatthetitlecomplexisunstableinMeCN.
简介：运用水热法合成了1个新的配合物[Ni（Phtpy）2]（CH3COO）2（化合物1）,（Phtpy=4′-苯基-2,2′∶6′,2″-三联吡啶）,并通过X-射线单晶衍射方法确定了该化合物的晶体结构.结构分析表明化合物1属于三斜晶系,P-1空间群,晶胞参数a=0.90560（8）nm,b=1.10307（9）nm,c=2.02014（15）nm,α=94.3830（10）°,β=100.9830（10）°,γ=106.3120（10）°,V=1.8831（3）nm3,Z=2,R1=0.0872,wR2=0.1831.配合物中存在3种氢键和多种π-π相互作用,使其成为一个3D配合物.
简介：Thetitlecomplex,[La(baec)1/2(H2btec)1/2(H2O)]n(H4btec=1,2,4,5-benzenetetracarboxylicacid)(1)wassynthesizedbythehydrothermalreactionof1,2,4,5-benzenetetracarboxylicdianhydridewithLa(NO3)3·6H2OinH2O,andcrystallizesinthetriclinicsystem,spacegroupP-1withα=0.64403(3)nm,b=0.94500(4)nm,c=0.96380(5)nm,α=88.535(2)°,β=100.314(2)°,γ=76.6470(10)°,V=1.69968(10)nm^3,Z=2,andfinalR=0.0274,Rw=0.0735.In1,eachLa(Ⅲ）ioniscoordinatedbyeightoxygenatomsfromsixcarboxylategroupsandonecoordinatedwatermolecule.TwodifferentcoordinstionmodesofH4btecwerePresentinthestructure,oneofwhichcontainstwoprotonatedcarboxylategrougpstobalancethecharge.
简介：Halfsandwichirondicarbonylcomplex[η5-C5H3(t-Bu)2]Fe(CO)2Cl(1)reactswith1,2-dilithiumdiselenocarboraneLi2Se2C2B10H10(2)togiveabinuclearironcarboranecomplex[η5-C5H3(t-Bu)2]2Fe2(CO)3*Se2C2B10H10(3).TheX-raydiffractionanalysisofcomplex3revealsthatoneoftheironatomsischiral.
简介：TostudytheintramolecularDiels-Aldercycloadditonof2H-chromen-2-oneasadiene,aseriesofchiralN-allyl-N-benzylamidesthatcontaina2H-chromen-2-onemoietyweredesignedforthesynthesisofbenzo[f]isoindol-l-onesviaanintramolecularDiels-Alderandasubsequentretro-Diels-AldercycloadditionwiththeexpulsionofCO2.Boththeyield（80%-89%）andabsolutestereocontrolofthetandemreactionwerehighwhenanelectron-withdrawinggroupwasattachedtothedienophile.Thedoublebondinthestyrenesubstructureremainedintheproductscouldbefurtherderivatizedbydihydroxylation.
简介：Three-dimensional(3D)flowerlikehierarchicalZn2GeO4andMn2+-dopedZn2GeO4microstructureshavebeenpreparedbyafacilehydrothermalapproach.X-Raydiffraction(XRD),fieldemissionscanningelectronmicro-scopy(FESEM),transmissionelectronmicroscopy(TEM)andphotoluminescence(PL)spectrometrywereemployedtocharacterizethesamples.SuchflowerlikehierarchicalZn2GeO4microstructureswithanaveragediameterof3―4μmwerefoundtobeconstructedbyabundantsinglecrystallinenanorodsofabout90nmindiameter.TheluminescentpropertiesofZn2GeO4:xMnphosphorswithdifferentcontentsofMn2+asanactivatorwereinvestigated.TheMn2+-dopedsamplesshowedgreenluminescencecorrespondingtothed-dtransitionofMn2+undertheirradiationofUVlight.Theredshift(from531nmto538nm)inλemwithincreasingMn2+contentwasobservedintheluminescentspectra,whichshouldbeattributedtoaweakcrystalfieldbecauseofthesubstitutionofZn2+byMn2+atadistortedtetrahedrallatticesite.
简介：AseriesofTiO2-XSiO2[Xdenotesthemolarfraction(%)ofsilicainthemixedoxides]withdifferentn(Ti)/n(Si)ratioswaspreparedwithammoniawaterasahydrolysiscatalyst.ThephotocatalystspreparedwerecharacterizedbyXRD,thermalanalysis,FTIR,UV-VisandSPS.ThecharacterizationresultsofFTIRandUV-VisspectrashowthatTiatomsweregraduallychangedfromoctahedralcoordinationtotetrahedralcoordinationwiththeadditionofsilica,whichisnotbeneficialforobtainingstrongBrnstedacidityandhigherphotocatalyticactivity.Thephotocatalyticactivityexperiments,whichwereconductedbyusingheptane(orSO2)asthemodelreactant,showedthatTiO2-SiO2containingasuitableamountofsilicacanexhibitmuchhigherphotocatalyticactivitythanpureTiO2.Theenhancedphotocatalyticactivitycanbeattributedtothreefollowingfactors:(1)smallercrystallinesize;(2)higherthermalstability;(3)thenewstrongBrnstedacidity.
简介：ＣａｒｂｏｎｙｌａｔｉｏｎｏｆＡｌｌｙｌＣｈｌｏｒｉｄｅＣａｔａｌｙｚｅｄｂｙＰｄＣｌ２（ＴＰＰＴＳ）２ｉｎＴｗｏ－ｐｈａｓｅＭｅｄｉｕｍＣａｒｂｏｎｙｌａｔｉｏｎｏｆＡｌｌｙｌＣｈｌｏｒｉｄｅＣａｔａｌｙｚｅｄｂｙＰｄＣｌ２（ＴＰＰＴＳ）２ｉｎ...
简介：ElectrolyticfixationofCO2wasinvestigatedbyelectrocarboxylationoforganichalides(RX),andfourestersⅠ,ⅡⅢ,Ⅳ)wereobtainedinmoderateyields.ElectrochemicalreductionesterificationsofRXinthepresenceofCO2werecarriedoutonnanocry'stallineTiO2-Ptelectrode.TheelectrochemicalbehaviorofRXinthepresenceofCO2wasinvestigatedbythetechniqueofcyclicvoltammetry,andtheprobablereactionmechanismw,asproposed.
简介：Emissionquenchingof[Ru(bpy)2(4,4’-dcbpy)](PF6)2(1)bybenzenamine,4-[2-[5-[4-[4-dimethylamino]phenyl]-4,5-di-hydro-1-phenyl-1H-pyrazol-3-yl]-ethenyl]-N,N-dimetyl(2)or1,5-diphenyl-3-(2-phenothiazine)-2-pyrazoline(3)wasobserved.Measurementsoftheemissiondecayof1beforeandafteradditionof2or3bysinglephotoncountingtechniquecon-finnedtheobservations.Theemissionquenchingof1by2or3wassubmittedtoStern-Volmerequation.Itwascalculatedthatthequenchingrateconstants(kq)are5.5×109(mol/L)-1s-1for2and4.0×109(mol/L)-1s-1for3,respectively.Theseresultsindicatedacharacterofdynamicquenchingprocess.Thesinglet-stateof2or3wasalsoquenchedby1.ThequenchingbehaviorsdidnotconformtotheStern-Volmerequationandinvolvedbothstaticanddynamicquenchingprocesses.Theapparentquenchingrateconstant(kapp)wascalculatedtobe3×109(mol/L)-1fortheinteractionofexcited2with1,and1.2×109(mol/L)-1forthatofexcited3wit
客服QQ：30444492琼网文【2021】1550-113号
增值电信业务经营许可证：琼B2-20210322
出版物经营许可证：新出发龙华出字第(2021)009号
广播电视节目制作经营许可证：(琼)字第00779号
版权所有 ©2002-2024 期刊网 琼ICP备2021005105号
![Hydrothermal Synthesis and Crystal Structure of a New <b style='color:red'>2</b>D Layer Compound [{Ni（en）<b style='color:red'>2</b>}<b style='color:red'>2</b>Sb8V14O42]·5.5H<b style='color:red'>2</b>O](/image/thesis2 "Hydrothermal Synthesis and Crystal Structure of a New <b style='color:red'>2</b>D Layer Compound [{Ni（en）<b style='color:red'>2</b>}<b style='color:red'>2</b>Sb8V14O42]·5.5H<b style='color:red'>2</b>O")
![Synthesis and crystal structure of [Co（mpt）<b style='color:red'>2</b>{P（OCH3）3}<b style='color:red'>2</b>]BF4 （Hmpt = <b style='color:red'>2</b>-mercaptothiazoline）](/image/thesis4 "Synthesis and crystal structure of [Co（mpt）<b style='color:red'>2</b>{P（OCH3）3}<b style='color:red'>2</b>]BF4 （Hmpt = <b style='color:red'>2</b>-mercaptothiazoline）")
![Synthesis of Novel Binuclear Samarium Thiolate Complexes [（THF）3I<b style='color:red'>2</b>Sm（μ-SAr）]<b style='color:red'>2</b> （Ar=Ph, 4-Me<b style='color:red'>2</b>NC6H4） and Crystal Structure of [（THF）3I<b style='color:red'>2</b>Sm（μ-S-4-Me<b style='color:red'>2</b>NC6H4）]<b style='color:red'>2</b>](/image/thesis6 "Synthesis of Novel Binuclear Samarium Thiolate Complexes [（THF）3I<b style='color:red'>2</b>Sm（μ-SAr）]<b style='color:red'>2</b> （Ar=Ph, 4-Me<b style='color:red'>2</b>NC6H4） and Crystal Structure of [（THF）3I<b style='color:red'>2</b>Sm（μ-S-4-Me<b style='color:red'>2</b>NC6H4）]<b style='color:red'>2</b>")
![Synthesis and Crystal Structure of a <b style='color:red'>2</b>D Honeycomb-like Polymeric Cluster （Et4N）3{[MoS4Cu<b style='color:red'>2</b>（μ-CN）]<b style='color:red'>2</b>（μ＇-CN）}·<b style='color:red'>2</b>MeCN](/image/thesis7 "Synthesis and Crystal Structure of a <b style='color:red'>2</b>D Honeycomb-like Polymeric Cluster （Et4N）3{[MoS4Cu<b style='color:red'>2</b>（μ-CN）]<b style='color:red'>2</b>（μ＇-CN）}·<b style='color:red'>2</b>MeCN")
![Crystal Structure and Bioactivity of Complex [Gd（C10H9N<b style='color:red'>2</b>O4）（C10H8N<b style='color:red'>2</b>O4）（H<b style='color:red'>2</b>O）3]<b style='color:red'>2</b>·phen·4H<b style='color:red'>2</b>O](/image/thesis8 "Crystal Structure and Bioactivity of Complex [Gd（C10H9N<b style='color:red'>2</b>O4）（C10H8N<b style='color:red'>2</b>O4）（H<b style='color:red'>2</b>O）3]<b style='color:red'>2</b>·phen·4H<b style='color:red'>2</b>O")
![Hydrothermal Synthesis and Structure of a New 3D Lanthanide—Carboxylate Framework,[La（btec）1／<b style='color:red'>2</b>（H<b style='color:red'>2</b>btec）1／<b style='color:red'>2</b>（H<b style='color:red'>2</b>O）]n（H4btec=1,<b style='color:red'>2</b>,4,5—Benzeneteracarboxylic acid）](/image/thesis11 "Hydrothermal Synthesis and Structure of a New 3D Lanthanide—Carboxylate Framework,[La（btec）1／<b style='color:red'>2</b>（H<b style='color:red'>2</b>btec）1／<b style='color:red'>2</b>（H<b style='color:red'>2</b>O）]n（H4btec=1,<b style='color:red'>2</b>,4,5—Benzeneteracarboxylic acid）")
![Syntheses, Crystal Structures and Characterization of Two Zeotype Crystals of K4[Cr30（H<b style='color:red'>2</b>O） 3（OOCH） 6] <b style='color:red'>2</b>[ P<b style='color:red'>2</b>W18O62]· 9.5H<b style='color:red'>2</b> O and K4[ Cr3O（ H<b style='color:red'>2</b>O）3（ OOCH）6 ]<b style='color:red'>2</b>[ H3 P<b style='color:red'>2</b> W17Co（H<b style='color:red'>2</b>O） O61]· 20H<b style='color:red'>2</b>O](/image/thesis12 "Syntheses, Crystal Structures and Characterization of Two Zeotype Crystals of K4[Cr30（H<b style='color:red'>2</b>O） 3（OOCH） 6] <b style='color:red'>2</b>[ P<b style='color:red'>2</b>W18O62]· 9.5H<b style='color:red'>2</b> O and K4[ Cr3O（ H<b style='color:red'>2</b>O）3（ OOCH）6 ]<b style='color:red'>2</b>[ H3 P<b style='color:red'>2</b> W17Co（H<b style='color:red'>2</b>O） O61]· 20H<b style='color:red'>2</b>O")
![Synthesis, Structure and Characterization of a Novel Asymmetrical Half-sandwich Binuclear Iron Carborane Complex [η5-C5H3(t-Bu)<b style='color:red'>2</b>]<b style='color:red'>2</b>Fe<b style='color:red'>2</b>(CO)3Se<b style='color:red'>2</b>C<b style='color:red'>2</b>B10H10](/image/thesis13 "Synthesis, Structure and Characterization of a Novel Asymmetrical Half-sandwich Binuclear Iron Carborane Complex [η5-C5H3(t-Bu)<b style='color:red'>2</b>]<b style='color:red'>2</b>Fe<b style='color:red'>2</b>(CO)3Se<b style='color:red'>2</b>C<b style='color:red'>2</b>B10H10")
![Photoinduced electron transfer of [ Ru （bpy）<b style='color:red'>2</b> （4, 4’-dcbpy）]<b style='color:red'>2</b>+ with electron donors](/image/thesis19 "Photoinduced electron transfer of [ Ru （bpy）<b style='color:red'>2</b> （4, 4’-dcbpy）]<b style='color:red'>2</b>+ with electron donors")