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Potentiometric and Theoretical Studies of (2Z, 3Z)-2H-benzo[b][1,4]thiazine-2,3(4H)-dionedioxime with Some Divalent Transition Metal Ions

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Abstract

The protonation equilibria of (2Z, 3Z)-2H-benzo[b][1,4]thiazine-2,3(4H)-dionedioxime (BTDH2) together with the equilibria of its bis- binary complexes of Co(II), Ni(II), Cu(II) and Zn(II) were investigated potentiometrically. The investigation was carried out at 25 ± 0.1 °C, in aqueous solution, with a constant ionic strength of 0.100 mol·dm−3 NaCl. The protonation constants of the ligand together with the stability constants of a variety of complexes were determined potentiometrically in 10 % ethanol–water mixed solution using the SUPERQUAD computer program. Theoretical calculations were set up to assist in understanding the protonation sequence in the ligand molecule via the semi-empirical molecule orbital method of parameterized model number 3. Results are discussed in connection to the basicity of the donor atoms and structural arrangement of the ligand. Although BTDH2 has two dissociable protons, four protonation constants can be measured under the experimental conditions presented. These four protonation constants (as log10 βs) are 10.245, 19.397, 22.414 and 25.176.

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Authors and Affiliations

  1. Department of Chemistry, College of Science, The University of Mustansiriyah, Baghdad, Iraq

    Faisal N. Al-Obaidi

  2. Chemistry Department, Science and Arts Faculty, Gaziosmanpasa University, 60250, Tokat, Turkey

    Hasan Atabey & Hayati Sari

  3. Department of Chemistry, Ondokuzmayıs University, 55139, Samsun, Turkey

    Mustafa Macit

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  1. Faisal N. Al-Obaidi
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  2. Hasan Atabey
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  3. Mustafa Macit
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Correspondence to Faisal N. Al-Obaidi.

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Al-Obaidi, F.N., Atabey, H., Macit, M. et al. Potentiometric and Theoretical Studies of (2Z, 3Z)-2H-benzo[b][1,4]thiazine-2,3(4H)-dionedioxime with Some Divalent Transition Metal Ions. J Solution Chem 43, 989–999 (2014). https://doi.org/10.1007/s10953-014-0176-1

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