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Study of complexation of phenylaza-15-crwon-5, 4-nitrobenzo- 15-crown-5, and benzo-15-crown-5 with Ag+, Tl+ and Pb2+ ions in methanol by competitive potentiometry

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Abstract

The complexation reaction of phenylaza-15-crwon-5, 4- nitrobenzo- 15-crown-5, and benzo-15-crown-5 with Ag+, Tl+ and Pb2+ ions in methanol solution have been studied by a competitive potentiometric method. The Ag+/Ag electrode used both as an indicator and reference electrode in a concentration cell. The emf of cell monitored as the crown ethers concentration varies through the titration. The stoichiometry and stability constants of resulting complexes have been evaluated by MINIQUAD. The stoichiometry for all resulting complexes was 1:1. The stability of these metal ions with derivatives of 15-crown-5 are in order phenylaza-15-crown-5 > Benzo-15-crown-5 > 4-nitrobenzo-15-crown-5, and for the each used crown ethers are as Pb2+ > Ag+ > Tl+. The effect of the substituted group on the stability of resulting complexes was considered. The obtained results are novel and interesting.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Arak University, P.O. Box 38156-879, Arak, Iran

    Javad Zolgharnein, Ghasem Shahmoradi & Saeid Amani

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  1. Javad Zolgharnein
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  2. Ghasem Shahmoradi
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  3. Saeid Amani
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Correspondence to Javad Zolgharnein.

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Zolgharnein, J., Shahmoradi, G. & Amani, S. Study of complexation of phenylaza-15-crwon-5, 4-nitrobenzo- 15-crown-5, and benzo-15-crown-5 with Ag+, Tl+ and Pb2+ ions in methanol by competitive potentiometry. J Incl Phenom Macrocycl Chem 60, 163–167 (2008). https://doi.org/10.1007/s10847-007-9364-6

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