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1 Polish Journal of Chemistry

1 2000

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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 M. R., Khoshdan N., Hashemi O. R., Seiyed Sajjadi S. A.

Polish Journal of Chemistry

2000

Vol. 74, nr 10

1389-1398

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.