简介：New[1+1]and62-membered[2+2]Schiffbasemacrocyclescontaininga2,6-diamidopyridinesubunithavebeensynthesizedbycondensationreactionoftheprecursorspyridine-2,6-dicarboxamideand1,10-bis(20-formylphenyloxy)decaneinthepresenceofphosphoricacidviaaone-potprocess.Thecyclocondensedproductswereeffectivelyisolatedbygelcolumnchromatographyandcharacterizedby~1HNMR,FTIR,massspectrometryandX-rayanalysis.Thetwomacrocycleshaveatwistedstructure,andnotanopen‘circular’conformationinthesolidstate.
简介：DBUH-Br3catalyzedselectiveconversionofsulfidestosulfoxidesinthepresenceofH2O2asoxidizingagentisdescribed.Thereactionwasperformedselectivelyatroomtemperatureandrelativelyshortreactiontimes.
简介：Thetitlecomplex[NH_3CH_2CH(NH_2)CH_3]_2[M(Ⅵ)O_2(OC_6H_4O)_2](M=Mo_(0.6)W_(0.4))wassynthesizedviaasimplesolution-phasechemicalroute.ThedeterminationofsinglecrystalX-raydiffractionrevealedthatthetitlecompoundiscrystallizedinamonoclinicsystemwithP2(1)/nspacegroup,a=1.0913(10)nm,b=1.0442(10)nm,c=1.8842(19)nm,α=90°,β=96.530(17)°,γ=90°,Z=4,andV=2.133(4)nm3.Themononuclearanionicunit[M(Ⅵ)O2(OC6H4O)2]2-displayschiralpseudo-octahedral[MO_6]coordinationgeometryandislinkedbychiralcationsviahydrogenbondandπ…πstackinginteraction.Thetransmissionelectronmicroscopyimagesshowthatthetitlecomplexiscomprisedofnano-particleswithdiametersrangingfrom20to50nm.TheNMRstudyshowsthe1Hdownfieldchemicalshiftsof[NH_3CHaHbCH(NH_2)CH_3]+cationsinthetitlecomplexwhenitismixedwithadenosine-triphosphate(ATP),andthechemicalshiftdifferencebetweenHaandHbisincreasedgreatly,andmostofthecatecholateligandsdissociatefromthecentralmetalatoms.TheDNAcleavageactivityexperimentrevealsthatDNAcleavagepromotedbythetitlecomplexislowerthanthatbyNa_2MoO_4whichpossessesantitumorpro-perty,buthigherthanthatbyNa_2WO_4.
简介：Newmodelcompound1H,1′H-Bis（benz-Δ^4-imidazoline)2,2′-spiro-titaniumdichloridewaspreparedandthestructureofthecompoundwasdeterminedby1R,MSandelementaryanalysis.
简介：WehavestudiedtheangularmagnetoresistanceofironpnictidesBaFe2-xNixAs2,whichshowsclear180degreeperiodicityasfittedbyacosinefunction.Inthex=0.065sample,thephaseofthetwo-foldsymmetrychanges90degreesabovethetetragonal-to-orthorhombicstructuraltransitiontemperatureTs.Sincethephaseatlowtemperatureisassociatedwiththerotationoforthorhombicdomainsbymagneticfield,weshowthatevenvacuumgreasecanpushthepresenceoforthorhombicdomainsattemperaturesmuchhigherthanTs.Ourresultssuggestthatresidualstressmayhavesignificanteffectsinstudyingthenematicordersanditsfluctuationsinironpnictides.
简介：ReactionsofCuSCNwithtetramethylthiuramdisulfideinCH3CNinthepresenceofstyreneandN,N,N',N',N'-pentamethyldiethylenetriaminegaverisetoanewcopper(Ⅰ)complexofN,N'-dimethyldithio-cabamate{[Cu(S2CNMe2)]2}n.ThetitlecompoundcrystallizedinthetriclinicP-1spacegroupwithlatticeparametersα=0.7610(4)nm,b=0.8911(4)nm,c=0.9268(5)nm,α=68.66(1)°,β=83.88(2)°,γ=79.31(2)°,V=0.5748(5)nm^3,Z=2.Thecompoundhasaunique1DchainstructurecomposedofCuSCSCuSCSeight-memberedringsandapairofCu-Sbonds,thestructureofwhichhasbeendeterminedbysingle-crystalX-raycrystallography.Theisolationofthiscompoundmayprovidesomehelpfulinformationforthecauseoftheinductionperiodsofthereverseatomtransferradicalpolymerization.
简介：Wereporteddiversesolitonoperationsinathulium/holmium-dopedfiberlaserbytakingadvantageofataperedfiber-basedtopologicalinsulator（TI）Bi2Te3saturableabsorber（SA）.TheSAhadanonsaturablelossof53.5%andamodulationdepthof9.8%.Stablefundamentallymode-lockedsolitonsat1909.5nmwithdistinctKellysidebandsontheoutputspectrum,apulserepetitionrateof21.5MHz,andameasuredpulsewidthof1.26pswereobservedinthework.Byincreasingthepumppower,bothbunchedsolitonswithsolitonnumberupto15andharmonicallymode-lockedsolitonswithharmonicorderupto10wereobtained.Toourknowledge,thisisthefirstreportofbothbunchedsolitonsandharmonicallymode-lockedsolitonsinafiberlaserat2μmregionincorporatedwithTIs.
简介：Mode-andpolarization-divisionmultiplexingoffernewdimensionstoincreasethetransmissioncapacityofopticalcommunications.Selectiveswitchesarekeycomponentsinreconfigurableopticalnetworknodes.Anon-chipsilicon2×2mode-andpolarization-selectiveswitchthatcanroutefourdatachannelsontwomodesandtwopolarizationssimultaneouslyisproposedandexperimentallydemonstratedforthefirsttime,tothebestofourknowledge.Theoverallinsertionlossesarelowerthan8.6dB.Toreducetheinter-modalcrosstalk,polarizationbeamsplittersareaddedtofiltertheundesiredpolarizationsormodes.Themeasuredinter-modalandintra-modalcrosstalkvaluesarebelow-23.2and-22.8dBforallthechannels,respectively.
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![One-pot synthesis of [1＋1] and 62-membered [<b style='color:red'>2</b>＋<b style='color:red'>2</b>] Schiff base macrocycles](/image/thesis0 "One-pot synthesis of [1＋1] and 62-membered [<b style='color:red'>2</b>＋<b style='color:red'>2</b>] Schiff base macrocycles")
![氨基酸功能化多钼酸盐[（Gly）<b style='color:red'>2</b>（H<b style='color:red'>2</b>O）<b style='color:red'>2</b>Cu]K3[Al（OH）6Mo6O18]·7H<b style='color:red'>2</b>O的合成及表征](/image/thesis7 "氨基酸功能化多钼酸盐[（Gly）<b style='color:red'>2</b>（H<b style='color:red'>2</b>O）<b style='color:red'>2</b>Cu]K3[Al（OH）6Mo6O18]·7H<b style='color:red'>2</b>O的合成及表征")
![Crystal Structure, Nano-particle Morphology and Interaction with ATP of [ NH3 CH<b style='color:red'>2</b> CH（ NH<b style='color:red'>2</b> ） CH3 ]<b style='color:red'>2</b> [ M（ Ⅵ ） O<b style='color:red'>2</b> （ OC6 H4 O）<b style='color:red'>2</b> ] （M = Mo0. 6 W0. 4 ） and Its Activity to Promote DNA Cleavage](/image/thesis9 "Crystal Structure, Nano-particle Morphology and Interaction with ATP of [ NH3 CH<b style='color:red'>2</b> CH（ NH<b style='color:red'>2</b> ） CH3 ]<b style='color:red'>2</b> [ M（ Ⅵ ） O<b style='color:red'>2</b> （ OC6 H4 O）<b style='color:red'>2</b> ] （M = Mo0. 6 W0. 4 ） and Its Activity to Promote DNA Cleavage")
![Synthesis and Crystal Structure of N,N＇-Dimethyldithio-arbamato-Copper（Ⅰ） Polymer {[Cu（Me<b style='color:red'>2</b>dtc）]<b style='color:red'>2</b>}n](/image/thesis13 "Synthesis and Crystal Structure of N,N＇-Dimethyldithio-arbamato-Copper（Ⅰ） Polymer {[Cu（Me<b style='color:red'>2</b>dtc）]<b style='color:red'>2</b>}n")
