简介:采用荧光光谱法研究了水溶液中四溴荧光素、四氯四溴荧光素、二碘荧光素、乙基罗丹明B、健那绿B等5种荧光染料探针与牛血清白蛋白(BSA)的相互作用.实验表明,这5种染料探针同牛血清白蛋白结合时,疏水作用力起决定性作用,静电力起次要作用,相比之下牛血清白蛋白(BSA)结合阴离子的能力最强,其次为中性分子,最后为阳离子.通过疏水作用力,5种染料均是以非极性苯基进入BSA疏水性腔体中同色氨酸残基发生作用,弱氢键的形成加强了这种作用力,且使得光谱间能量转移效率明显提高.5种染料探针的极性部位由于极性和空间效应的原因难以进入腔体内部,致使反应均按接近1∶1的方式进行.
简介:Theorientationoftheadditionof5-amino-3-benzylthio-1,2,4-triazoleanditsanalogues(pyrazole)(1)withthearylisocyanatecanbedirectedbycontrollingthereactiontemperatureandoneoftheproduct,5-amino-1-arylaminocarbonyl-3-benzylthio-1,2,4-triazole(pyrazole)(2),canrearrangeat170Ctoanotherproduct,5-arylureylene-3-benzylthio-1,2,4-triazole(pyrazole)(3).Aplausiblemechanismexplanationforthisrearrangementreactionwaspresented.Itwassuggestedthattherearrangementreactioncouldbereferredtothethermodynamicstranspositionleadingtothepredominant5-arylureylene-3-benzylthio-1,2,4-triazoleenergypreferentially.
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:Thecrystalstructureofthetitlecomplex{[Co(TCB)2/2-(IMI)2(H2O)2][Co(IMI)4(H2O)2]}(H2O)4(whereTCB=1,2,4,5-benzenetetracarboxylicanion;IMI=imidazole)hasbeendeterminedbyX-raydiffractionmethod.Crystaldatafor{[Co(TCB)2/2(IMI)2(H2O)2][Co(IMI)4(H2O)2]}-(H2O)4:triclinic,spacegroupP1,a=1.0647(2)nm,b=1.1165(1)nm,c=1.00361(1)nm,α=91.56(1)°,β=111.34(1)°,γ=115.642(10)°,V=0.9772(3)nm5,Z=1.Thepolymercobalt(II)complexhasanovelthree-dimensionnetworkstructure.Co(1)atomandCo(2)atombotharecoordinatedinanoctahedralarrangementandlocatedinthecenterofthecoordinationanionandthecenterofthecoordinationcation,respectively.MoreoverfourcarboxylgroupsofTCBaredividedintotwotypes,twopara-carboxylgroupsbridgeCo(1)atominmonodentatefashionandothertwopara-carboxylgroupsareinfree.
简介:Aseriesof2’-purineandpyrimidinederivativesof1’,4’-anhy-dro-2’-deoxy-D-arabitol(1)and1’,4’-anhydro-2’-deoxy-D-altritol(2)weresynthesizedregio-andstereo-selectivelyfromD-sorbitolthroughsomeconversioninhighyields.
简介:Anefficientsynthesisoffunctionalized4H-chromenesbythetandemreactionofb,g-unsaturatedaketoesterswith2-naphthols,1-naphthols,and1,3-dihydroxynaphthaleneshasbeenaccomplishedwithhighselectivityandexcellentyieldsinthepresenceofacatalyticamountofbismuthtriflate[Bi(OTf)3,5mol%]undermildconditions.Thefunctionalized4H-chromenesynthesisandourprevious2Hchromenehemiacetalsynthesiscouldcomplementeachothertoenrichreactiondiversity.
简介:Thetitlecompounds5a-5cwerepreparedviathereactionofmethyl2-perfluoroal-kynoates(4)withmethyl5-oxo-4-(triphenylphosphoranylidene)hex-2-enoate(3),whichwasobtainedfromthereactionofmethylpropynate(2)withacetylmethylenetriphenylphosphorane(1)at-5-0℃.IntramoleculareliminationofPh3POtookplacewhencompound5washeatedinaqueousmethanolat115-120℃insealedtube,yieldingdimethyl2-trifluoromethyl-4-methylisophthalate(6a)from5aandmethyl5-acetyl-4-hydroxy-2-heptafluoropropanylbenzoate(6b)from5b,respectively.Thestructuresofcompounds5,6aand6bwereconfirmedbyIR,MS,1HNMR,19FNMRand13CNMRspectroscopyandelementalanalyses.Rectionmechanismsfortheformationofcompounds5,6aand6bwereproposed.
简介:有核心壳的合成nanoparticles组织的Cross-linked-cyclodextrinpolymer/Fe3O4在carboxymethyl-cyclodextrin的表面上经由生气连接反应被准备(厘米--CD)在-cyclodextrin的修改Fe3O4nanoparticles由把epichlorohydrin用作crosslinking的碱的答案代理人。准备合成nanoparticles的形态学,结构和磁性被传播电子显微镜学(TEM)调查,Fourier变换红外线(FTIR)spectrometry,X光检查衍射(XRD)测量,thermogravimetric分析(TGA)和颤动的样品magnetometry(VSM)分别地。
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简介:利用室温液相还原、晶种生长的方法,成功的制备了大小形貌均一、性能稳定且具有磁性的Fe3O4@Cu2O复合纳米粒子,并且对制备的Fe3O4@Cu2O纳米粒子进行了光催化性能的研究.在以紫外光为光源的照射下,合成的Fe3O4@Cu2O纳米粒子对有机染料甲基蓝溶液起到很好的降解作用.更重要的是,在外加磁场的作用下,Fe3O4@Cu2O纳米粒子容易回收,具有良好的可循环利用性能.
简介:在这研究,新奇的分子地印的开的多孔的膜(MIOPM)为甲基4-hydroxybenzoate(M4HB)的选择吸附和分离用皮克林抱起对方的大腿把他摔倒模板方法和分子的印技术作好准备。模板M4HB,功能的单体,crosslinker和plastifier2-ethylhexylacrylate(2-EHA)在油阶段被包含。恐水病的硅石nanoparticles(HNP-SiO2)作为stabilizer被采用与nonionic表面活化剂sorbitantrioleate(跨度85)建立稳定的W/O皮克林抱起对方的大腿把他摔倒。SEM和FTIR的结果显示最佳的MIOPM成功地被准备并且拥有了开、互连的毛孔。然后,MIOPM为M4HB被用作吸着剂。关联系数(为Langmuir-Freundlich等温线模型和pseudo-second-order的R2)价值运动模型适合到吸附平衡和运动数据都分别地比0.95高。最大的吸附能力和为MIOPM4的快速的吸附的时间是4.146 ;mg ;g−1和100 ;min分别地。另外,为与在结构上相比的M4HB的MIOPM的渗透分离因素联系了模拟甲基2-hydroxybenzoate(M2HB)能到达3.122。