Conductometric studies of the thermodynamics complexation of Li~+, Na~+, K~+, Mg~(2+), and Ba~(2+) ions with 4,4'(5')-Di-tert-butyldibenzo-18-crown-6 ligand in acetonitrile, ethanol and methanol solutions

摘要

The complexation reaction between 4',4"(5")-di-tert-butyldibenzo-18-crown-6, ligand and Li~+, Na~+, K~+, Mg~(2+), and Ba~(2+) ions were studied conductometrically in acetonitrile, ethanol, and methanol solutions. The formation constants of the 1:1 and 2:1 complexes (metal to ligand) were calculated from the computer fitting of the molar conductance in various mole ratios at 10, 20, 30, and 40 °C. The enthalpy and entropy changes of the complexation reactions in acetonitrile, ethanol, and methanol were estimated at four different temperatures.