ISSN:0021-2148    

DOI:10.1002/ijch.197000107

出版商:WILEY‐VCH Verlag    

年代:1970

数据来源: WILEY

摘要:

AbstractThe polarographic reduction of chlorate catalyzed by molybdenum‐tungsten mixtures is investigated. The reduction currents are limited by the rate of the chemical reactions in the bulk of the solution. The reactants are adsorbed on the mercury drop. Their rate of adsorption is fast compared to the rate of the chemical reaction

ISSN:0021-2148    

DOI:10.1002/ijch.197000108

出版商:WILEY‐VCH Verlag    

年代:1970

数据来源: WILEY

摘要:

AbstractThe electrochemical reduction of indigo in pyridine as solvent has been investigated in connection with the determination of oxygen dissolved in pyridine, using polarography, cyclic voltammetry, controlled electrode potential electrolysis and coulometry. In the absence of protons, the total current of the first and second reduction waves for an unsaturated solution of indigo (LiClO4as background electrolyte) apparently represents a one‐electron transfer. In the presence of an excess of available protons (added as pyridinium nitrate), indigo is reduced in a reversible two‐electron process to indigo white (leucoindigo). The rapid conversion of indigo white to indigo by oxygen in pyridine solution can be used to determine coulometrically the concentration of oxygen in pyridine via measurement of the indigo produced on adding the pyridine‐oxygen sample to a solution of in situ electrolytically generated indigo white. The latter approach indicated a general method for the determination of dissolved oxygen in nonaqueous sol

ISSN:0021-2148    

DOI:10.1002/ijch.197000109

出版商:WILEY‐VCH Verlag    

年代:1970

数据来源: WILEY

摘要:

AbstractThe mechanism of the electrochemical oxidation of I−and I2at the bright Pt and Au electrodes and at platinized Pt ‐ electrodes saturated with H2or O2, was investigated by voltammetric and adsorption measurements. I131was used for adsorption detection. I−is strongly adsorbed and electrochemically oxidized to IO−at the bright electrodes as a function of the anode potential, but relatively weak adsorption takes place at the platinized electrodes. I2shows an apparent desorption as a function of anode po

ISSN:0021-2148    

DOI:10.1002/ijch.197000110

出版商:WILEY‐VCH Verlag    

年代:1970

数据来源: WILEY

摘要:

AbstractThe voltammetric behaviour of aqueous nickel ethylenediamine solutions has been studied. Electrocatalytic oxidation waves were obtained which are attributed to the formation of trivalent and possibly also tetravalent nickel ethylenediamine complexes as intermediates. The mechanism of the electrocatalytic process is discussed.

ISSN:0021-2148    

DOI:10.1002/ijch.197000111

出版商:WILEY‐VCH Verlag    

年代:1970

数据来源: WILEY

摘要:

AbstractCerium (IV) oxide prepared at high temperatures in air shows ESR absorption signals. The oxide prepared at low temperatures shows very diffuse signals. Heating the oxide in vacuum at 1000° or in hydrogen at 298° results in a reduction of the intensity of the signal. A theory was developed to show that the ESR signal is obtained from the quasi free electron in non‐stoichiometric ce

ISSN:0021-2148    

DOI:10.1002/ijch.197000112

出版商:WILEY‐VCH Verlag    

年代:1970

数据来源: WILEY

摘要:

AbstractThe interfacial tension of 2, 4‐dichlorophenol/acidic solution, 23 ergs/cm2, was calculated from Nielsen's equations which combine homogeneous nucleation theory and diffusion controlled growth. The parameters measured were induction periods in the millisecond range and the technique employed was photographing the appearance of turbidity on a film moving at 50cm/sec velocity. The calculated value was compared with direct measurements of 2, 4‐dichlorophenol's surface tension in air and in solut

ISSN:0021-2148    

DOI:10.1002/ijch.197000113

出版商:WILEY‐VCH Verlag    

年代:1970

数据来源: WILEY

摘要:

AbstractThe reactions between Fe3+ions and acetylacetonedioxime (AADO) have been studied by potentiometric, polarographic and spectrophotometric methods. Two Fe3+ions are reduced in aqueous solution by one AADO molecule to give Fe2+ions and the oxidized form of AADO (NPO = AADO‐2e = 2‐nitrosopent‐2‐en‐4‐one oxime). NPO forms a water soluble, red coloured complex with Fe (III). The synthesis of bis (2‐nitrosopent‐2‐en‐4‐one oximato) Fe (III) complex is described. The elemental analysis of the solid complex is consistent with the composition FeO (NPO)2(OH). The IR, EPR and Mössbauer spectra of the complex are presented and the bonding properties of the coordination environment of Fe (III) is discussed. A mechanism for the oxydoreduction and complexation reactions for the Fe3+‐AADO system is proposed and its kinetic parameters are: kox.red.= 1.72 × 10−1min

ISSN:0021-2148    

DOI:10.1002/ijch.197000114

出版商:WILEY‐VCH Verlag    

年代:1970

数据来源: WILEY

摘要:

AbstractThe preparation of the crystalline octahedral complex tris (triphenylphosphonium) hexachloro‐americate (III) is reported. The absorption spectra of the octahedral hexachloro complexes of curium (III), americium (III) and most of the trivalent lanthanides in a nitrile solvent are also reported. The dissociation of the hexachloro americate complex anion in the nitrile solvent and in propylene carbonate has been examined. The stepwise association constant K6for its formation from the pentachloro complex was found to be 150 ± 20 and 60 ± 20 in 85% vol succinonitrile 15% acetonitrile solvent and in propylene carbonate respectiv

ISSN:0021-2148    

DOI:10.1002/ijch.197000115

出版商:WILEY‐VCH Verlag    

年代:1970

数据来源: WILEY

摘要:

AbstractCobalt (II) ions were sorbed from various solutions onto the chelating ion exchanger Dowex A‐1. The infrared, near infrared and visible spectra of the various sorbed species were measured and compared to the spectra of cation and anion exchangers loaded with cobalt species under the same equilibrating conditions and to the complexes formed with the monomeric iminodiacetate. The structure and bonding of the different species sorbed were discusse

ISSN:0021-2148    

DOI:10.1002/ijch.197000116

出版商:WILEY‐VCH Verlag    

年代:1970

数据来源: WILEY