European Journal of Chemistry

Complexation of manganese(II), cobalt(II), nickel(II) and copper(II) by a ligand derived from 1,2,4-triazole: Potentiometric studies and Density Functional Theory calculations



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Ouassini Benali Baitich
Nawel Lechani
Maamar Hamdi
Fahima Aklil
Samia Khabouche
Djaffar Kheffache
Sofiane Moussi
Ourida Ouamerali

Abstract

DFT calculations have been conducted to understand the conformational and tautomeric preference of 4-amino-5-(2-hydroyphenyl)-2,4-dihydro-3H-1,2,4-triazole-3-thione ligand. The results suggest that the thione tautomer is found to be the most stable form in the gas phase, which is in very good agreement with the FT-IR and crystallographic data. The protonation constants of the ligand and the stability constants of its complexes with Mn(II), Co(II), Ni(II) and Cu(II) have been determined by potentiometry in water-ethanol (90:10, v:v) mixture. The absolute pKa values of the ligand have been calculated using DFT method to complement and help the assignment of potentiometric data. DFT calculations have also been carried out for some metallic complexes species formed in solution in order to propose their most probable structures.

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Baitich, O. B.; Lechani, N.; Hamdi, M.; Aklil, F.; Khabouche, S.; Kheffache, D.; Moussi, S.; Ouamerali, O. Complexation of manganese(II), cobalt(II), nickel(II) and copper(II) by a Ligand Derived from 1,2,4-Triazole: Potentiometric Studies and Density Functional Theory Calculations. Eur. J. Chem. 2013, 4, 285-291.

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