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1 2002

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Differential Pulse Polographic Study of mercury Complexes with Some Benzo-Substituted macrocyclic Diamides in Binary Nitromethane+Dimethylformamide Mixtures

Shamsipur M., Fakbari A. R., Sharghi H., Eshghi H., Ganjali M. R.

Polish Journal of Chemistry

2002

Vol. 76 / nr 12

1665-1671

The complex formation of Hg2+ ion with five recently synthesized benzo-substituted macrocyclic diamides in binary nitromethane + dimethylformamide mixtures was studied by differential pulse polarography at 25_C. The stoichiometry and stability of the complexes were determined by monitoring the shift in the Hg2+ differential pulse peak potential against the macrocycles concentration. In all cases studied, it was found that the stability of the resulting 1:1 complex decreases drastically by increasing the amount of dimethylformamide in the binary mixtures. The observed stability order in a given solvent mixture is discussed in terms of the cavity size, structural flexibility and nature of the substituted on the macrocyclic diamide ring.