ISSN:0021-2148    

DOI:10.1002/ijch.197200064

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractSoftness parameters σMfor cations and σXfor anions, have been calculated as dimensionless quantities for approx. 90 cations and 18 anions. They are given by σM= [σA(Mm+) ‐ σA(H+)]/σA(H+) and σX= [σB(Xa−) ‐ σB(OH−)]/σA(H+) where σA= [σIi(M) + ΔH0h(Mm+)]/mand σB= [‐Ea(X) + ΔH0h(Xa−)]/aare Ahrland's parameters. The new normalized and comparative (to the test ions H+and OH−) softness parameters are positive for soft ions and negative for hard ones. These parameters, obtained independently, are used with a four‐coefficient equation to calculate coordinate bond energies for metal halides with acceptable accuracy. Considerations of the average coordination in reciprocal molten salt mixture lead to an expression for the metathesis energy change as proportional to the product of the differences in softness parameters of the two cations and the two anions. An empirical one‐coefficient equation involving the softness parameters is proposed to deal with next‐nearest‐neighbor interactions in binary common‐ion molten salt mixtures. These relationships are then used with Blander and Topol's equation to predict the occurrence of irascibility gaps in uni‐univalent reciprocal salt mixtures. The gaps found in other systems are also discussed in terms

ISSN:0021-2148    

DOI:10.1002/ijch.197200065

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractThe stepwise protonation constants of the ligand and the stability constants of Alizarin Red S with some bivalent metal ions, Pb2+, Cu2+, Zn2+, and Hg2+have been determined at 30° and at various ionic strengths viz. 0.02, 0.05, 0.15 and 0.20, maintained by sodium perchlorate solution. The formation of the chelate is evident from the shift between the (i) ligand and (ii) ligand and metal titration curves. From the values of the stepwise protonation constants and metal ligand stability constants at various ionic strengths, thermodynamic formation constants were evaluated by extrapolation to zero ionic strength. The order of stability constants was found to be:Cu>Pb>Zn>H

ISSN:0021-2148    

DOI:10.1002/ijch.197200066

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractAs little as 0.1 mg boron (1 mg/liter) may be determined in salt solutions containing as much as 400 g/liter MgCl2, MgBr2, NaCl, KCl and CaCl2or in analytical reagent grade salts with an accuracy of 2% relative. The lower monovalent alcohols do not interfere. The two equivalent points, the gap between them and the role of ionic strength are discussed.

ISSN:0021-2148    

DOI:10.1002/ijch.197200067

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractThe formation of a sequence of insoluble Pd(II) compounds was demonstrated by heterometric titration. The species Pd4AADO (AADO = acetylacetone dioxime), Pd2AADO and PdAADO were detected and a further compound, Pd(AADO)2was synthesized. The elemental analysis of Pd2AADO and Pd(AADOH), is reported. The visible spectrum of Pd/AADO mixtures in solution (at pH = 11) is reported and assigned. IR spectra of Pd2AADO, Pd(AADO)2and AADO are recorded and compared, and the structure of the compounds is deduced.

ISSN:0021-2148    

DOI:10.1002/ijch.197200068

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractA review of the use of the classical Boltzmann distribution equation in the Gouy theory indicates that it is only a special case, neglecting important parameters. It is indicated that the present double layer theory needs to be revised to include also the effect of the electrical field on the water as a dielectric. The pressure in the electrical double layer of montmorillonite clay‐water systems is, thus, evaluated. It is shown that the water pressure in the double layer may reach hundreds of atmosphere

ISSN:0021-2148    

DOI:10.1002/ijch.197200069

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractPreviously published cell dimensions of Rb3Mn2Cl7are confirmed and atomic positions are given. The crystal structure of low temperature Rb2CoCl4is reported. The material was found to belong to the orthorhombic system, space group Pnma with a = 9.272 ± 0.006 Å, b = 7.283 ± 0.004, c = 12.723 ± 0.006 Å and Z

ISSN:0021-2148    

DOI:10.1002/ijch.197200070

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractThe fluorescence quenching in benzene vapor is investigated, using lifetime measurements. The self‐quenching reaction is studied at various temperatures and the activation energy for this process is determined to be 950 cm−1. The effect of some simple gases on the fluorescence lifetime is also stud

ISSN:0021-2148    

DOI:10.1002/ijch.197200071

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractReaction of H atoms with glutathione leads rapidly to H + RSSR → RS · + RSH. The first observed product is RS, the spectrum of which is obtained. The spectrum of the RS̄SR radical was obtained by direct attack of e−aqon glutathione. The rate constants of these processes were also measured.ke−aq+ RSSR = (2.7 ± 0.3) × 109M−1sec−1kH + RSSR= (1.0 ± 0.2) × 1010M−1sec−1When the OD of RS̄SR is plotted vs pH a titration curve is obtained. This is due to the protonation of RS̄SR with a rate constant of 2.6 × 1010M−1sec−1which is probably followed by a cleavage to RS and RSH. In both cases the RSSHR radical cannot be detected. The spectrum attributed to the RSSHR radical is mo

ISSN:0021-2148    

DOI:10.1002/ijch.197200072

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractThe pulse radiolytic technique has been used in order to prove that the central nickel atom, in the oxidized form of the nickel‐dimethyl‐glyoxime complex, is in its trivalent oxidation st

ISSN:0021-2148    

DOI:10.1002/ijch.197200073

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY