Analytical Study of Non-Aqueous Solutions of Crown Ethers Complexes by Conductivity.

Abstract

The conductivity of NaCI, KCI and RbCI in ethanol has been studied in absence and presence of crown ethers 12C4, 15C5, 18C6 and DC18C6. The stability constant “LogK” of the resulting 1:1 complexes between cation (Na^+, K⁺ and Rb⁺) with crown ethers were determined by molar conductivity-mole ratio data. The order of LogK values for Na⁺ DC18C6˃ 18C6˃ 15C5, K⁺ DC18C6˃ 18C6˃ 15C5˃ 12C4 and Rb⁺ 18C6˃ DC18C6˃ 15C5˃ 12C4. The Thermodynamic formation of complexation was determined, it reflects the tight association between cation and donor atoms of crown ethers. The solvent effect was also studied and results revealed that this effect follow the dielectric consonant of solvent. The experimental-analytical approach is followed in this research paper.