简介：Anovelaciddyeacidwassynthesizedbythecondensationreactionbetweenbromamineacidand2-amino-6-nitrobenzothiazoleanditsanti-UVprotectionpropertieswereevaluated.Theresultsshowedthatsilkdyedwiththisdyehadverygoodultravioletradiationprotectioncapabilityandexcellentdyeingperformance.TheUV-absorptionmechanismofthisdyewasalsodiscussed.
简介：IntroductionIn2O3·Snfilmshavehightransparency（>95％）withinthevisiblespectralregion,lowresistivity(10-2—10-4ohm·cm)atroomtemperatureandsuperiorthermalstability.Thesefilmshavebeenappliedtosolarcells,electronicsandphotoelectronicsfields.Inrecentyears,organometallic-CVDmethodhasemergedasasuccessfulalternatetothephysicalmethodsandgeneralCVDforthegrowthofthesefilms.TheMO-CVDtech-
简介：Using2-bromo-1-methylpyridimiumiodideascarboxylactivatingagent,10ansa-macrolactamswerepreparedconvenientlyfromthecorrespondingseco-precursorw-aminoacidsintheyieldsof78-2%.
简介：［1］G.C.Chinchen,P.J.Denny,J.R.Jennings,M.S.Spencer,K.C.Waugh,Appl.Catal.,1988,36,1.［2］R.A.Koppel,A.Baiker,Appl.Catal.,1992,84,77.［3］M.Satio,T.Fujitani,M.Takeuchi,T.Watanabe,Appl.Catal.,1996,138,311.［4］J.A.Brown,N.Homs,A.T.Bell,J.Catal.,1990,124,73.［5］J.S.Lee,K.Moon,S.H.Lee,S.Y.Lee,Y.G.Kim,Catal.Lett.,1995,34,93.［6］C.Frohlich,R.A.Koppel,A.Baiker,M.Kilo,A.Wokaun,Appl.Catal.,1993,106,275.［7］J.F.Deng,Q.Sun,Y.L.Zhang,D.Wu,S.Y.Chen,Appl.Catal.,1996,139,75.［8］K.K.Bando,K.Sayama,H.Kusama,K.Okabe,H.Arakawa,Appl.Catal.,1997,165,391.［9］G.C.Chinchen,K.C.Waugh,D.A.Whan.Appl.Catal.,1986,25,101.［10］B.Denise,R.P.A.Sneeden,B.Beguin,O.Cherifi.Appl.Catal.,1987,30,353.［11］G.C.Chinchen,K.C.Waugh.J.Catal.,1986,97,280.［12］T.H.Fleisch,R.L.Mieville.J.Catal.,1984,90,165.［13］K.Klier,V.Chatikavanij,R.G.Herman,G.W.Simmons.J.Catal.,1982,74,343.［14］R.Burch,R.J.Chappel.Appl.Catal.,1992,45,65.［15］H.Berndt,V.Briehn,S.Evert.Appl.Catal.,B,1992,86,65.［16］W.P.Dow,Y.P.Wang,T.J.Huang.J.Catal,1996,160,155.
简介：Threepairsofnovel2-aryl-3,4,5-trihydroxypiperidines(6–8andtheirenantiomers),thepiperidineanaloguesofthepyrrolidinealkaloidsradicamineAandradicamineB,werepreparedfromsixmemberedcyclicnitronesthroughaconcisetwo-stepprocedure,i.e.,Grignardreagentadditionanddeprotection.Thesenovelpolyhydroxylatedpiperidineiminosugarswereassayedagainst10typesofenzymes.Onlycompound8exhibitedweakinhibition(IC501080mmol/L)againstb-galactosidasefromratintestinallactases.
简介：Synthesisandsurfaceactivepropertiesoftheoxyethylenatedfattyalcohol2-hydroxypropylsulfonateswereinvestigated.Ofallsurfaceactivecompoundsstudied,thosewitha2-hydroxypropyl(HP)moietyinthemoleculearemoresurface-activethanthecorrespondingcompoundswithoutit.
简介：TheelectrooxidationofBilirubin（BR）inN,N’-dimethylformamide（DMF）andDMF+H2Omixedsolventisinvestigatedbyvoltammetrytechniques,insiturapidscanthinlayerspectroelectrochemistryandinsituESRspectroscopy.ThedatarevealthattheoxidationprocessofBRundergoesmanystages,whichareallspedupbytheintroductionofwater.ThespeciesofbilirubintakingpartinthereactionisfoundtobechangedfromBRinDMFintoBR’inthemixedsolventsandtheanodicpeakpotentialisshiftedcorrespondinglyfrom+0.58Vto+0.026-+0.35V（vs.Ag/AgCl,1.0MKCl）.Freeradicalsandthedimerizationofthemareobservedduringtheoxidation.
简介：Aseriesofpolybenzoxazoles(co)polymersbearingcrankshaftunitsinthemainchainwassynthesizedbytheconventionalsolutionpolycondensationof4,6-diaminorescinoldihydrochloride,terephthalicacid(TA)and2,6-naphthalenedicarboxylicacid(NDA).Allofthepolymersshowlyotropicliquidcrystalbehaviorinpolyphosphoricacid(PPA)andmethanesulfonicacid(MSA).Thepolybenzoxazolesexhibitanexcellentthermalresistancealthoughthecrankshaftmonomerhasbeenintroducedintothepolymerbackbone.Thetemperatureforthe5%weightlossofallthepolymersisabove600℃.TheX-raydiffractionanalysisresultsshowthattheseriesofthepolymershasahighcrystallinity.TheintroductionofNDAmakesaslightdecreaseinthethermalresistanceofthepolymers.ThemaximumabsorptionpeakintheUV-Visspectracanbeadjustedaccordingtotheamountof2,6-naphthaleneunitsinthepolymers,whichindicatesthepotentialapplicationofthepolymersasoptoelectriematerials.
简介：Theorientationalorderoftwoliquidcrystals,namely,6-［4-(4-nitrophenylazo)phenyloxy］hexyldiethanolamines(C6)and10-1-bromo［4-(nitrophenylazo)phenyloxy］alkane(B10)wasstudiedbymeansof2HNMRspectroscopywithhexamethylbenzene-d18astheprobemolecule.TheresultsshowthatthedirectorsinthesmecticAphaseofC6andthenematicphaseofB10couldbealigned,whichwasparalleltothemagneticfield.TheorientationalorderparameterofthesolutemoleculesinC6wasabout0.2,whileitisonly0.1inB10,whichisexpectedbecausethemoreorderedsmecticphasetendstoalignsolutemoleculestoahighlevel.ComparedtotheorientationalorderparameterofthesoluteintheSmCphaseof4［3,4,5-tris(4-dodecyloxybenzyloxy)-benzoyloxy］-4-(4′-dodecyloxybenzoyloxy)biphenyl(Ⅰ)(P2=0.14),itislargerinSmAphaseofC6.TherelativelyhigherorientationalorderparameterofthesoluteinC6isattributedtotheformationofintermolecularH-bondsintheSmAphaseofC6.
简介：Fe2O3/activecarbon(Fe2O3/AC)nanocompositeswerereadilyfabricatedbypyrolyzingFe3+impregnatedactivecarboninanitrogenatmosphere.Theas-preparedcompositeswerestudiedbyX-raypowderdiffraction(XRD),X-rayphotoelectronspectroscopy(XPS)andtransmissionelectronmicroscopy(TEM).Thecapacitivepropertyofthecompositeswasinvestigatedbycyclicvoltammetry(CV)andgalvanostaticcharge-dischargetest.Physicalcharacterizationsshowthattheγ-Fe2O3finegrainsdispersedintheACwell,withameansizeof21.24nm.Electrochemicaltestsin6mol/LKOHsolutionsindicatethattheas-preparednanocompositesexhibitedimprovedcapacitiveproperties.Thespecificcapacitance(SC)ofFe2O3/ACnanocompositeswasupto188.4F/gthatwasderivedfrombothelectrochemicaldouble-layercapacitanceandpseudo-capacitance,whichwas78%largerthanthatofpristineAC.AsymmetriccapacitorwithFe2O3/ACnanocompositesaselectrodeshowedanexcellentcyclingstability.TheSCwasonlyreducedbyafactorof9.2%after2000cyclesatacurrentdensityof1A/g.
简介：Aseriesofaromaticimineswerereducedtocorrespondingaminesinexcellentyieldsby2-phenyl-N,N-dimethylbenzimidazoline(PDMBI)photochemicallyinthepresenceofmagnesiumperchloride(Mg(ClO4)2).AMg2+mediatedphotoinducedelectrontransfermechanismwasproposed.
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