共查询到20条相似文献,搜索用时 140 毫秒
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《高等学校化学研究》1997,(4)
SystematicStudiesonCorelationBetweenHydrophobicConstantPandSolutePhysico┐chemicalParameters*BAIJian-e(DepartmentofChemistry,L... 相似文献
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SynthesesandStudiesofPEG┐b┐PNIPABlockPolymersCAOWei-xiao**andZHANGTao(ColegeofChemistryandMolecularEnginering,PekingUniversit... 相似文献
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EfectofSteamontheOxidativeCouplingofMethaneoverLa┐BaSystemCatalysts**SupportedbytheNationalNaturalScienceFoundationofChina.**... 相似文献
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StudiesonaNewSystemofLithiumFastIonConductorsBasedonKaoliniteandLiZr2(PO4)3HUANGJian-dong**,LINBin,WANGWen-ji(DepartmentofCh... 相似文献
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StructuresandVibrationalSpectraofC2andLaC+2Clusters*WUZhi-jian,MENGQing-boandZHANGSi-yuan**(ChangchunInstituteofAppliedChemis... 相似文献
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AbInitioStudiesontheStructureandBindingInteractionofM+CO2(M=Sc,Ti…Zn)*FANHong-Jun,ZHONGShi-Jun,LIUChun-Wan**(FujianInstituteo... 相似文献
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TheActiveOxygenSpeciesforOxidativeCouplingofMethaneoverCeO2/BaF2CatalystbyinSituConfocalMicroprobeRamanSpectroscopy**Supporte... 相似文献
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MA Xiuli* HAO Chunyan LU Shixiang SUN Yunxiu LIU Juzheng LIU Shu ying 《高等学校化学研究》1998,14(2):143-146
IsolationandCharacterizationofaBioactivePolysaccharidefromPanaxQuinquefoliumL.MAXiu-li*,HAOChun-yan,LUShi-xiang,SUNYun-xiu,L... 相似文献
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SynthesisandStructureofSchiffBaseComplexContaining'Cu_4O'CoreMAChang-qin ̄*,YUZheng-gang,ZHANGWen-xing,WANGXu-ningandJIANGDe-h... 相似文献
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SynthesisofNorbornene-EthyleneBlockCopolymerbythePolymerizationMechanismConversion ̄*WUQing ̄* ̄*,LUZe-jian,CHENXue-xin,SONGYang... 相似文献
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用 X 射线光电子能谱法对四氯化铂(PtCl_4)及铂氯酸(H_2PtCl_6·6H_2O)掺杂聚乙炔进行了研究.发现Pt4f 与 Cl2p 谱峰均由相距约1.5eV 的两组峰组成.Pt4f 高结合能端的组份可指认为四价铂,而低结合能端的组份为二价铂.对 Pt4f 及 Cl2p 峰积分强度的分析表明,对二价铂有:[Cl]/[pt~(2 )]=2,对四价铂有:[Cl]/[pt4~ ]=6.C 1s 峰也由两个分离约1eV 的峰组成,高结合能端的强度随掺杂浓度的增加而增加.这些结果说明铂盐掺杂聚乙炔通过由高分子链向掺杂剂的电荷转移而使部份高分子链被氧化,部份四价铂盐被还原成 PtCl_2.透射电镜形态观察及选区电子衍射证明膜上存在 PtCl_2的聚集.电荷转移链段在高分子链上的分布是无规的.并由此估计了电荷转移链段上每个碳原子的电荷约为 0.2|e|.由以上结果我们推断 PtCl_4与 H_2PtCl_6·6H_2O 的电荷转移过程可由下式表达.对 PtCl_4 掺杂:2PtCl_4 2e→PtCl_6~(2-) PtCl_2对 H_2PtCl_6掺杂:2H_2PtCl_6 2e→PtCl_6~(2-) PtCl_2 4HCl这两种掺杂剂的对阴离子均是 PtCl_6~(2-)离子. 相似文献
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Metallation of >-haloacetals wth sodium dicarbonyl-h5-cyclopentadienyl- ferrate (Fp-) provides a convenient point of departure for the synthesis of alhyde -iron complexes (FpCHRCHO) and of h2-vinyl alcohol and vinyl ether cations [Fp(CH2=CHOR)]+. These latter complexes are shown to be best described as distorted dihapto cation. Treatment of FpCOCH2OMe with strong acid leads to the ketene hemiacetal cation [Fp(CH2=C(OH)OMe)]+ rather than to the expected ketene complex. This substance, as well as the acetal cation [Fp(CH2=C(OMe)OEt)]+ prepared by alkylation of FpCH2COOMe, may possess the structure of an h1-metal complex incorporating a carboxonium ion. A correlation is shown to exist between the chemical shift of cyclopentadienyl protons and the average infrared carbonyl stretching frequency in a variety of Fp(olefin)+ FpR complexes. 相似文献
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Stefania Villa Giacomo Luca Evoli Giorgio Cignarella Michela M. Curzu Grard A. Pinna 《Journal of heterocyclic chemistry》1999,36(2):485-492
Dehydrogenation and amination of 4,4a,5,6-tetrahydro and 5,6-dihydrobenzocinnolinones in refluxing hydrazine hydrate to give new benzo[h]cinnolinones and 4-aminobenzo[h]cinnolinones are reported, and reaction mechanisms proposed. Experiments were also extended to 4,4a-dihydro-5H-indenopyridazinone which underwent hydrazine induced dehydrogenation to 5H-indenopyridazin-3-one but not subsequent amination. 相似文献
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Thorsten Bluhm 《Journal of heterocyclic chemistry》1981,18(1):189-190
The synthesis of benzo[h]cinnolin ( 3 ) is reported. Its spectroscopic properties (uv, luminescence, pmr, ms) are similar to the other diazaphenanthrenes containing a diazine ring. The lowering of the basicity of 3 compared with a monoazaphenanthrene like other diaza-aromatic compounds appears to be due to an electrostatic field effect and not to an inductive effect. 相似文献
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Competitive inhibition ELISA for quantification of Ara h 1 and Ara h 2, the major allergens of peanuts 总被引:1,自引:0,他引:1
Allergies to peanuts are becoming an increasingly important health problem as a result of the persistence and severity of the reaction in allergic individuals. Because no treatment currently is available, avoidance is the only option for peanut-allergic individuals. Avoidance of an abundant and often disguised food such as peanuts, however, is very difficult; therefore, competitive inhibition ELISAs were developed to detect and quantitate each of the major peanut allergens, Ara h 1 and Ara h 2. Under optimal conditions for each assay, the sensitivity of the Ara h 1 and Ara h 2 detection assays were 12 and 0.5 ng/mL, respectively. These assays were primarily devised to effectively compare the levels of Ara h 1 and Ara h 2 in a wide variety of peanuts or peanut products but can also be used to identify cross-reactive antigens. The method is simple and rapid, requiring only one allergen-specific antibody and, therefore, could be adapted specifically to detect the presence of these individual allergens in different foods. 相似文献
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香茶菜属二萜类化合物的1H NMR 研究 总被引:1,自引:0,他引:1
通过对二十三个香茶菜植物中二萜类化合物的1HNMR 参数的归纳, 总结了这些化合物的主要质子信号的规律, 用分子模型使分子立体结构(B,C 环构象和取代基构型)与峰形相关连, 为此类化合物的签别和结构确定提供了依据. 相似文献