摘要:

AbstractThe emfs of cells without‐junction Pt, H2(g,p0)|HCl(mE)|AgCl

ISSN:1001-604X    

DOI:10.1002/cjoc.19960140302

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1996

数据来源: WILEY

摘要:

AbstractThe magnetic property of μ3‐oxotriiron(III) complex [Fe3O(OBz)6(CH3OH)3](NP3)‐(CH3OH)2(HOBzbenzoic acid) has been studied. We use isosceles triangle model and molecular field correction to fit the experimental magnetic susceptibility data. It shows that an intramolecular antiferromagnetic exchange interaction occurs withJ= ‐31.27 cm−1,J'= ‐27.26 cm−1, and a weaker intermolecular antiferromagnetic exchange interaction occurs withzJ' = ‐3.76 cm−1. We give thed5‐d5‐d5energy level diagram of triiron(III) complex as a function ofJ'/J.From the diagram we can get the total spinST of the complex as 1

ISSN:1001-604X    

DOI:10.1002/cjoc.19960140303

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1996

数据来源: WILEY

摘要:

AbstractA new series of ion‐pair complexes [Mo(dtc)4] [Ln(dtc)4] (LnLa‐Er, exp. Pm) were synthesized from MoCl5, LnCl3and Nadtc in anhydrous methanol. The crystal structures of the four complexes, [Mo(dtc)4J[Ln(dtc)4] (LnNd, Sm, Ho and Er) have been determined by X‐ray diffraction. Spectroscopic properties of all these complexes are also discu

ISSN:1001-604X    

DOI:10.1002/cjoc.19960140304

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1996

数据来源: WILEY

摘要:

AbstractHel photoelectron spectra of ω‐heterocycle α‐cyano polyenic ethyl ester compounds (1–6) have been given in this paper. Assignment of the spectra is also done with the aid of HeI photoelectron spectroscopic (PES) results of smaller molecules which have similar atomic group to the molecules studied, and the aid of MNDO molecules orbital calculations. The lowest PES experimental ionization potentials (IPs in eV) of different molecules reduce gradually with the increasing number of ethylenic group. The ‐CO2C2H5group can be only considered as a su

ISSN:1001-604X    

DOI:10.1002/cjoc.19960140305

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1996

数据来源: WILEY

摘要:

AbstractA computer‐assisted method is presented for simultaneous optimization of three‐factor of temperature programming (initial temperature, temperature rising rate and carrier gas flow rate) for the separation of eleven compounds in capillary gas chromatography. The optimization of the separation over the experimental region is based on a special polynomial from fifteen preliminary experiments using the resolution as the selection criterion. Computer scanning technique was used for optimum selection on three dimensions. Excellent agreement was found between the predicted data and the experimental resu

ISSN:1001-604X    

DOI:10.1002/cjoc.19960140306

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1996

数据来源: WILEY

摘要:

AbstractElectropolymerizedo‐phenylenediamine film is used as a functional coating for the immobilization of anti‐S.aureusantibody on the surface of a gold‐plated piezoelectric crystal, and this piezoelectric immunosensor is applied to detectS. aureus.The frequency shift (ΔF=F20z ‐ F380z, Hz) between the frequency at the 20th second (after the addition of sample,F20Z) and that at 380 seconds later (F380z) was introduced to construct a calibration graph, and shortening of assay time was achieved. TheS. aureusconcentrations in the range of 105–109cells/mL can be detected by t

ISSN:1001-604X    

DOI:10.1002/cjoc.19960140307

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1996

数据来源: WILEY

摘要:

AbstractAn extraction‐free spectrophotometric method for the determination of cationic surfactants, such as cetylpyridinium chloride, cetyltrimethylammonium bromide and zephiramine is proposed, which is based on the formation of ternary complexes with Fe(III) and chrome azurol S. The molar ratio of the complex is 2:1:1 (Fe(III):chrome azurol S: cationic surfactant). The method is simple, rapid and sensitive, giving an apparent molar absorptivity of 4.5×104L·mol−1‐cm−1and a linear range of 0.1–6.0 μmol/L cationic surfactants. The total cationic surfactant content can be determined directly in aqueous solutions by measuring the absorbance at 680 nm (pH 5.8). The method has been successfully applied to w

ISSN:1001-604X    

DOI:10.1002/cjoc.19960140308

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1996

数据来源: WILEY

摘要:

AbstractTheoretical consideration was proposed for the influences of the oscillator phase on the response nature of an electrode‐separated piezoelectric sensor (ESPS) to liquid properties and verified experimentally. For the oscillators with different phases, the oscillation frequency of the ESPS may increase, maintain nearly constant or decrease with increasing conductivity in low conductivity solutions. The sensitivity of response to density and viscosity increases slightly with increasing oscillator phase. The response to permittivity depends hardly on the oscillator phase. In addition, the dependence of the oscillation frequency of the ESPS on the supply voltage of the oscillator was explained. The ESPS was used to determine atropine sulfate with a detection limit of 1.6·10–7m

ISSN:1001-604X    

DOI:10.1002/cjoc.19960140309

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1996

数据来源: WILEY

摘要:

AbstractThe composition and properties of the anodic films formed on Pb and Pb‐3at. %Sb alloy at ‐0.10 V (vs. Hg/HgO) for 2.5 h in 0.1 mol·dm−3NaOH solution (25°C) were investigated by cyclic voltammetry, linear sweep voltammetry, open circuit decay curve, photocurrent technique, X‐ray diffraction (XRD) and scanning electron microscopy (SEM). It was found that the anodic film formed on Pb mainly consists oft‐PbO, while that on Pb‐3at.%Sb consists of o‐PbO, t‐PbO and a small amount of orthorhombic Sb2O3. The dominant component of the film anodically grown on Pb‐3at.%Sb for less than 5 min iso‐PbO, however,t‐PbO is the major component of the anodic film formed for 1 h or longer. It is established that Sb suppresses the growth oft‐PbO. The anodic film formed on Pb‐3at.%Sb is less porous than that on Pb. The bandgap energies of t‐PbO ando‐PbO in the films were determined by photocurrent measurements to be 1.83–

ISSN:1001-604X    

DOI:10.1002/cjoc.19960140310

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1996

数据来源: WILEY

摘要:

AbstractA facile method for the title transformation is described. The reaction of 2,2,6,6‐tetramethyl‐4‐methoxypiperidine oxoammonium chloride (1b) and ketones bearing α‐methylene group in acetonitrile proceeded smoothly to give the α‐oxyfunctionalized coupling products (6a‐h). These coupling products decomposed upon heating in acidic medium to produce α‐diketones (7a‐h) in good t

ISSN:1001-604X    

DOI:10.1002/cjoc.19960140311

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1996

数据来源: WILEY