Complex formation of silver, thallium and alkali cations with dibenzo-30-crown-10 in some non-aqueous solutions
1991; Elsevier BV; Volume: 183; Issue: 1 Linguagem: Inglês
10.1016/s0020-1693(00)82996-5
ISSN1873-3255
AutoresMohammad K. Amini, Mojtaba Shamsipur,
Tópico(s)Inorganic and Organometallic Chemistry
ResumoThe complexation reactions between dibenzo-30-crown-10 and Li+, Na+, K+, Rb+, Cs+, Ag+ and Tl+ ions have been studied conductometrically in 1,2-dichloroethane, nitromethane, acetonitrile, acetone and dimethylformamide solutions at 25 °C. The stability constants of the resulting 1:1 complexes were determined, and found to decrease in the order Tl+ > Rb+ ≈ K+ > Ag+ > Cs+ > Na+ > Li+. In 1,2- dichloroethane solution, the complexation process results in dissociation of ion pairs. There is an inverse relationship between the stabilities of the complexes and the Gutmann donicity of the solvents. The data obtained in this study support the existence of a 'wrap around' structure for the above complexes in solution.
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