15598-34-2Relevant articles and documents
Thermodynamic study of some pyridinium ion derivatives with 18-crown-6, aza-18-crown-6 and 1,10-diaza-18-crown-6 in acetonitrile
Ganjali,Khoshdan,Hashemi,Seiyed Sajjadi
, p. 1389 - 1398 (2007/10/03)
The complexation between the salts of protonated of pyridine, 2-methyl pyridine, 2,4-dimethyl pyridine and 2,4,6-trimethyl pyridine and macrocyclic ligands 18-crown-6, aza-18-crown-6 and 1,10-diaza-18-crown-6 have been studied conductometrically in acetonitrile at different temperature. Formation constants of the resulting 1:1 complexes were determined by the computer fitting of the molar conductance-mole ratio data. The stability of complexes decrease in the sequence: 1,10-diaza-18-crown-6 > aza-18-crown-6 > 18-crown-6. The enthalpy and entropy of complexation were determined from the temperature dependence of the formation constants. In all cases, the complexes were enthalpy stabilized, but entropy destabilized.