Vol. 7, Issue 4 (2019)
Complexation of benzo-18-crown-6 with Zn2+, Co2+ and Ni2+ ions in MeOH-water solvent mixtures by Conductometric study
Author(s): Md. Delwar Hossen, Pijush Kanti Roy, Md. Saddam Hossain and Dr. DM Shafiqul Islam
Abstract: The conductance behavior of some metal ions such as Ni2+, Co2+ and Zn2+ and their complexes with crown ether (Benzo-18-crown-6) have been studied in 10%, 20%, 30%, 40% and 50% MeOH-water mixed solvent at 308.15K, 313.15K, 318.15K, and 323.15K temperatures. The Conductometric studies indicate the 1:1 complex formation between the studied metal ions and crown ether, Benzo-18-crown-6. The order of stability constants with the studied crown ether is found to be Co (II) > Ni (II) > Zn (II) for all solvent compositions at all temperatures. The stability constants for all Ni2+, Co2+ and Zn2+ with crown ether complexes in MeOH-water mixed solvents were found to be increase with the increase in organic portion in the solvent composition for all temperatures. Thermodynamic parameters such as ΔG0, ΔH0 and ΔS0 for the complexation reactions have been determined. The stability constants of the complexes were found to be decrease with increase in temperature. The enthalpy and entropy of complexation formations were determined from the temperature dependence of the stability constants.
Pages: 1084-1089 | 244 Views 56 Downloads
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How to cite this article:
Md. Delwar Hossen, Pijush Kanti Roy, Md. Saddam Hossain, Dr. DM Shafiqul Islam. Complexation of benzo-18-crown-6 with Zn2+, Co2+ and Ni2+ ions in MeOH-water solvent mixtures by Conductometric study. Int J Chem Stud 2019;7(4):1084-1089.
