摘要:

AbstractIn the variational optimization of a trial function the proper functional to be varied is the Rayleigh quotient with the normalization constraint explicitly imposed. It will be shown that only under certain very rigorous conditions can one use the energy functional to replace the Rayleigh quotient and that, therefore, the normalization constraint is by no means a matter of no consequence.

ISSN:0009-4536    

DOI:10.1002/jccs.198500001

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

摘要:

AbstractWe investigated the effect of counter ion (Cu2+) adsorption on Sodium Dodecylsulfate and Sodium Tetradecylsulfate micelle by three different techniques: surface tension decrease, copper‐selective electrode and electric conductivity. The effect of added copper ion on critical micelle concentration (CMC) was determined. The effectiveness of these three techniques was critically evaluated. It is concluded that copper ions are able to strongly displace Sodium ions from the micellar surfac

ISSN:0009-4536    

DOI:10.1002/jccs.198500002

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

摘要:

AbstractA numerical solution of the nonlinear Poisson‐Boltzmann equation (PBE) is presented for a system of spherical micelles with counterfoil binding. The approach investigates the following effects on ion micelle interactions, (i) total surface charge, (ii) competitions of different counter ions on micellar surfaces and (iii) surface potential determination. The theory is applied to interpret the ion activities in micellar solution as measured by ion‐selective electro

ISSN:0009-4536    

DOI:10.1002/jccs.198500003

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

摘要:

AbstractThe photochemical reaction of Re2(CO)10with thiophene in hexane solution was investigated under vacuum. Three rhenium clusters: H2Re3(CO)12, HRe3(CO)14and Re3(CO)14(OH)4, were isolated. The structure of Fellmann‐Kaesz cluster Complex HRe3(CO)14was determined by use of the X‐ray diffraction method. The three rhenium atoms form a plane of symmetry and L: Re1Re2Re3is 107°. The ten carbonyl groups bonded to the two terminal rhenium atoms Re1and Re3, are staggered with respect to the central rhenium atoms. The bond lengths are 3.10 Å for Re2‐Re3and 3.34 Å for Re1‐Re2. The bridging hydride is between

ISSN:0009-4536    

DOI:10.1002/jccs.198500004

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

摘要:

AbstractCarbonylation of benzyl halides to phenylacetic acid was studied in a two‐phase system with iron pentacarbonyl as the catalyst precursor. The solutions consisted of a benzyl halide and iron pentacarbonyl in benzene and tetrabutylammonium hydrogen sulfate in aqueous sodium hydroxide. Stirring under carbon monoxide readily produced phenylacetic salts in aqueous phase which were then acidified and extracted with ether. The yields of phenylacetic acid from benzyl iodide and from benzyl bromide were similar at a evel of about 50percnt;, that of the latter being higher by 1%. The yield from benzyl chloride was far less, at a level of only 21%. The rate as studied with gas chromatography was found to decrease in the order benzyl iodide>benzyl bromide>benzyl chlorid

ISSN:0009-4536    

DOI:10.1002/jccs.198500005

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

摘要:

AbstractThe ruthanium‐catalyzed hydrogenation of acetic acid to ethanol was conducted at 140–230° under hydrogen pressure of 40.8–81.6atmwith a catalyst loading of 4g/L.The best rate expression to fit the experimental results isKinetic data at 230° were obtained with an average error of 7%. It is concluded that the rate limiting step is the first addition of hydrogen to acetic acid to produce aldehyde and water as the intermediates. The activation energy is 12.7kc

ISSN:0009-4536    

DOI:10.1002/jccs.198500006

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

摘要:

AbstractCoordination compounds of cobalt (II) with four new schiff bases of furyl glyoxal, 2‐furyl‐methyl‐2′‐carboxylato ketoanil (2 FMCKA), 2‐furyl glyoxal ethyenediimine (2 FGED), 2‐furyl giyoxal‐2′‐sulphonic acid anil (2 FGSAA) and 2‐furyl glyoxal‐2′‐chloro‐4‐nitro anilimimine (2 FGCNA) were prepared and characterised with the help of elemental analyses, magnetic measurements, infra‐red and electonic spectral data. Various ligand field parameters such as 10Dq, B&C,F2&F4,f2&f4,h,B°etc.and transition energies ν1;, ν2&ν3, were calculated with the help of electronic spectral data. The ν(C=N) bands in the IR spectra of all the ligands are lowered in complexation indicating nitrogen coordination of the ligands. All these studies indicate that cobalt(II) ion is

ISSN:0009-4536    

DOI:10.1002/jccs.198500007

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

摘要:

AbstractThe dissociation constants foro‐carboxyphenylhydrazoethylacetoacetate (o‐CPHEA) ligand, as well as the stability constants for the divalent metal complexes of Cu, (II), Ni (II), Co (II), Zn (II)and Cd (II) ions, have been calculatedpH‐meterically in different solvents. The dissociation constanspK1=4.10 andpK2=10.55 of the insoluble organic ligand are calculated in aqueous medium. The effect of solvents, the relation between stabilities and both electronegativities and ionization potential are st

ISSN:0009-4536    

DOI:10.1002/jccs.198500008

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

摘要:

AbstractThe polarographic behaviour of uranium and tellurium has been studied in the presence of increasing concentration of complex forming agent viz. ϵ‐caprolactam atpH 4.4 for U(VI) and atpH 10.0 for Te(IV) at μ=0.1MKNO3. In both cases the waves have been found to be diffusion controlled and irreversible. The values of kinetic parameters (σπaandK°f,h) have been calculated as a function of the ligand concentration. Method is suitable for the quantitative determination of these metals individually and simultaneously with the effect of divers

ISSN:0009-4536    

DOI:10.1002/jccs.198500009

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

摘要:

AbstractIn combination with the use of SEP‐PAK cartridges and computerized difference infrared spectroscopic technique, a simple novel method for analyzing lubricating oil additives was developed. The present method involves solvent extraction and the use of SEP‐PAK C18for separating polar additives from residual base oil, followed by the use of SEP‐PAK Silica for further elution. With the aid of infrared data station, components of the polar additives were identified. The present method is definitely much more rapid and efficient than the conventional column separation method, and the separation efficiency of this simple method is comparable to that of using flash chromatographic tech

ISSN:0009-4536    

DOI:10.1002/jccs.198500010

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY