Rates of formation of nickel(II) chelate complexes with bidentate substituted-pyridine ligands in dimethyl sulphoxide solution

Solvation of Li+, Be2+, Na+, Mg2+, and Al3+ ions has been studied in binary mixtures with dimethyl sulphoxide, dimethylformamide, acetonitrile and water, and in ternary mixtures of the organic solvents with water. The CNDO/2 quantum chemical method was used to calculate the energies of solvation, molecular structures and charge distributions for the complexes acetonitrile...ion (1:1, 2:1, 4:1), dimethyl sulphoxide...ion (1:1), dimethylformamide...ion (1:1), and acetonitrile (dimethyl sulphoxide, dimethylformamide)...ion...water (1:1:1).

Download Full-text

Viscosity, electrical conductivity and density of the system ammonium nitrate-dimethyl sulphoxide

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19841109 ◽

1984 ◽

Vol 49 (5) ◽

pp. 1109-1115

Author(s):

Jindřich Novák ◽

Zdeněk Kodejš ◽

Ivo Sláma

Keyword(s):

Electrical Conductivity ◽

Aqueous Solutions ◽

Ammonium Nitrate ◽

Transport Properties ◽

Calcium Nitrate ◽

Dimethyl Sulphoxide ◽

Present System ◽

Empirical Equations ◽

Concentrated Solutions ◽

Nitrate Solutions

The density, viscosity, and electrical conductivity of highly concentrated solutions of ammonium nitrate in dimethyl sulphoxide have been determined over the temperature range 10-60 °C and the concentration range 7-50 mol% of the salt. The variations in the quantities as a function of temperature and concentration have been correlated by empirical equations. A comparison is made between the transport properties for the present system, aqueous solutions of ammonium nitrate, and calcium nitrate solutions in dimethyl sulphoxide.

Download Full-text

Extraction of hafnium(IV) with N-benzoyl-N-phenylhydroxylamine solutions from strongly acid solutions containing dimethyl sulphoxide or hexamethylphosphor triamine

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19842205 ◽

1984 ◽

Vol 49 (10) ◽

pp. 2205-2209

Author(s):

Jiří Příhoda ◽

Alois Zeman

Keyword(s):

Ion Exchange ◽

Dimethyl Sulfoxide ◽

Dimethyl Sulphoxide ◽

Polar Phase ◽

Acid Solutions ◽

Extraction Mechanism

The extraction of hafnium(IV) with N-benzoyl-N-phenylhydroxylamine solutions in chloroform or toluene from strongly acid (HClO4) solutions of dimethyl sulfoxide or hexamethylphosphor triamide has been studied. These substances were found to suppress the conversion of the extraction mechanism from ion exchange to solvation: while in solutions free of these substances this conversion takes place at HClO4 concentrations of about 4 mol l-1, in the mixed aqueous-organic (polar) phase the requisite acid concentrations are considerably higher. The possible causes of this effect are discussed.

Download Full-text

Ion solvation by dipolar aprotic solvents. An ab initio study

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19870006 ◽

1987 ◽

Vol 52 (1) ◽

pp. 6-13 ◽

Cited By ~ 2

Author(s):

Petr Kyselka ◽

Zdeněk Havlas ◽

Ivo Sláma

Keyword(s):

Ab Initio ◽

Geometry Optimization ◽

Molecular Structures ◽

Dimethyl Sulphoxide ◽

Ion Solvation ◽

Interaction Energies ◽

Ab Initio Study ◽

Solvation Energies ◽

Dipolar Aprotic Solvents ◽

Complete Geometry Optimization

The paper deals with the solvation of Li+, Be2+, Na+, Mg2+, and Al3+ ions in dimethyl sulphoxide, dimethylformamide, acetonitrile, and water. The ab initio quantum chemical method was used to calculate the solvation energies, molecular structures, and charge distributions for the complexes water···ion, acetonitrile···ion, dimethyl sulphoxide···ion, and dimethylformamide···ion. The interaction energies were corrected for the superposition error. Complete geometry optimization was performed for the complex water···ion. Some generalizations are made on the basis of the results obtained.

Download Full-text