Chromium(III) complexes in dipolar aprotic solvents. VII. Competitive anation studies with [Cr(Me2SO)6]3+ in dimethyl sulphoxide

1975 ◽  
Vol 28 (3) ◽  
pp. 501
Author(s):  
STD Lo ◽  
DW Watts
Keyword(s):  
Ion Pairs ◽  
Product Formation ◽  
Dimethyl Sulphoxide ◽  
Aprotic Solvents ◽  
Interchange Reaction ◽  
Dipolar Aprotic Solvents

P.The competitive anation reactions: [Cr(Me2SO)6]3+ + X- + Cl- [CrCl(Me2SO)5]2+ + Me2SO CrX(Me2SO)5]2+ + Me2SO [CrX(Me2S0)5]2*+ Me2S0 where X- is N3- or SCN- have been studied in Me2SO at one temperature as a function of the concentrations of X- and Cl-. The results are compatible with a dissociative interchange reaction of ion aggregates, and require that ion triplets as well as ion pairs contribute to product formation. The results are consistent with our previous results on the anation of Cr(Me2SO)63+ separately by SCN-, N3- and Cl-.

Octahedral cobalt(III) complexes in dipolar aprotic solvents. II. Association between cis- and trans-dichlorobisethylenediamine cobalt(III) cations,[Co en2 Cl2]+, and chloride and bromide ions in the solvents NN-dimethylformamide, dimethyl sulphoxide, and LVN-dimethylacetamide

1966 ◽  
Vol 19 (1) ◽  
pp. 43 ◽  
Author(s):  
WA Millen ◽  
DW Watts
Keyword(s):  
Spectrophotometric Method ◽  
Ion Pairs ◽  
Ion Association ◽  
Ion Pair ◽  
Association Constants ◽  
Dimethyl Sulphoxide ◽  
Aprotic Solvents ◽  
Ion Association Constants ◽  
Cis And Trans ◽  
Dipolar Aprotic Solvents

Ion association constants at 30� have been determined for the cis-[Co en, Cl2]+Cl- ion pair in NN-dimethylformamide (DMF), NN-dimethylacetamide (DMA), and at 20.0�, 25.0�, and 30.0� in dimethyl sulphoxide (DMSO), by a spectrophotometric method. Association constants for the cis-[Co en2 Cl2]+Br- and the trans- [Co en2 Cl2]+Cl- ion pairs have also been determined in DMF at 30�.

Solvation of ions by dipolar aprotic solvents and water. A CNDO/2 study

1985 ◽  
Vol 50 (11) ◽  
pp. 2493-2508 ◽  
Author(s):  
Petr Kyselka ◽  
Zdeněk Havlas ◽  
Ivo Sláma
Keyword(s):  
Binary Mixtures ◽  
Quantum Chemical ◽  
Chemical Method ◽  
Molecular Structures ◽  
Dimethyl Sulphoxide ◽  
Ternary Mixtures ◽  
Aprotic Solvents ◽  
Quantum Chemical Method ◽  
Solvation Of Ions ◽  
Dipolar Aprotic Solvents

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).

Chromium(III) complexes in dipolar aprotic solvents. VI. The anation of Hexa(dimethyl sulphoxide)chromium(III) [Cr(Me2SO)6]3+ in dimethyl sulphoxide

1975 ◽  
Vol 28 (3) ◽  
pp. 491 ◽  
Author(s):  
STD Lo ◽  
DW Watts
Keyword(s):  
Ionic Strength ◽  
Dimethyl Sulphoxide ◽  
Aprotic Solvents ◽  
Analogous Reaction ◽  
Dipolar Aprotic Solvents ◽  
Interchange Reactions

The anation reactions: �������������������� Cr(Me2SO)63+ + X- → CrX(Me2SO)52+ + Me2SO have been studied in detail for X- = N3- and SCN- as a function of concentration, temperature and ionic strength in both conditions of X- in excess over Cr(Me2SO)63+, and Cr(Me2SO)63+ in excess over X-, where greater certainty exists concerning the nature of the solution species. The reactions are interpreted as dissociative interchange reactions in which anation is a probable result of dissociation only when the anion occupies a position in the first solvation sphere of the complex. ��� Less complete results are presented for the less tractable anation of Cr(Me2SO)63+ by Cl- in Me2SO, and the analogous reaction of Cr(HCONMe2)63+ by Cl- in dimethylformamide.

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