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1 Polish Journal of Chemistry

1 2003

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Conductance Study of Complexation of Ammonium and Alkylammonium Ions with Some Aza-Substituted Crown Ethers in Binary Acetonitrile-Dimethylsulfoxide Mixtures

Hasani M., Darabi M., Shamsipur M.

Polish Journal of Chemistry

2003

Vol. 77 / nr 3

345-354

A conductance study of the interaction between ammonium and four different alkylammonium ions and dibenzodiaza-15-crown-4 (DBDA15C4), diaza-18-crown-6 (DAl8C6), aza-18-crown-6 (A18C6) and dibenzyldiaza-18-crown-6 (DBzDAl8C6) in acetonitrile-dimethylsulfoxide mixtures was carried out at 25_C. The formation constants of the resulting l:l complexes were determined from the molar conductance-mole ratio data and, in the case of all cations used, found to vary in the order DBDAl5C4 > DAl8C6 > A18C6 > DBzDAl8C6. In all cases, the substitution of alkyl groups on the ammonium ion is found to decrease the stability of the resulting macrocycles' complexes, the sequence of which being NH4 + >MeNH3 + > EtH3 + > Et NH 2 2 + > Et3NH+. The stability of all complexes in the binary mixtures used was found to decrease with increasing mole fraction of dimethylsulfoxide.