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A Polarographic Study of Tl+, Pb2 and Cd2+ Complexes with Dicyclohexano-18-Crown-6 in Some Binary Mixed Solvents

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Abstract

The complexes of Tl+, Pb2+ and Cd2+ cations with the macrocyclic ligand, dicyclohexano-18-crown-6\linebreak(DC18C6) were studied in water/methanol (H2+O/MeOH), water/1-propanol (H2+O/1-PrOH), water/acetonitrile (H2+O/AN), water/dimethylformamide (H2+O/DMF), dimethylformamide/acetonitrile (DMF/AN), dimethylformamide/methanol (DMF/MeOH), dimethylformamide/1-propanol (DMF/1-PrOH) and dimethylformamide/nitromethane (DMF/NM) mixed solvents at 22 °C using differential pulse polarography (DPP), square wave polarography and conductometry. In general, the stability of the complexes was found to decrease with increasing concentration of water in aqueous/non-aqueous mixed solvents with an inverse relationship between the stability constants of the complexes and the concentration of DMF in non-aqueous mixed solvents. The results show that the change in stability of DC18C6.Tl+, vs the composition of solvent in DMF/AN and DMF/NM mixed solvents is apparently different from that in DMF/MeOH and DMF/1-PrOH mixed solvents. While the variation of stability constants of the DC18C6.Tl+ and DC18C6.Pb2+ complexes vs the composition of H2+O/AN mixed solvents is monotonic, an anomalous behavior was observed for variations of log Kf vs the composition of H2+O/1-PrOH and H2+O/MeOH mixed solvents. The selectivity order of the DC18C6 ligand for the cations was found to be Pb2+ > Tl+ > Cd2+.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran

    Gholamhossein Rounaghi, Ali Sarafraz Yazdi & Zahra Monsef

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  1. Gholamhossein Rounaghi
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  2. Ali Sarafraz Yazdi
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  3. Zahra Monsef
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Rounaghi, G., Sarafraz Yazdi, A. & Monsef, Z. A Polarographic Study of Tl+, Pb2 and Cd2+ Complexes with Dicyclohexano-18-Crown-6 in Some Binary Mixed Solvents. Journal of Inclusion Phenomena 43, 231–237 (2002). https://doi.org/10.1023/A:1021283200802

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