Synthesis, Physical, Chemical and DFT Properties of Cobalt(II), Nickel(II), Copper(II), and Zinc(II) Complexes with Polydentate Schiff Base Derived from 1,2,4-Triazole

Fatima Haitham Zuhair; Zahraa Salim Al-Garawi; Mahmoud Najim Al-jibouri; Gehad Genidy Mohamed; Abanoub Mosaad Abdallah

doi:10.22146/ijc.90234

Synthesis, Physical, Chemical and DFT Properties of Cobalt(II), Nickel(II), Copper(II), and Zinc(II) Complexes with Polydentate Schiff Base Derived from 1,2,4-Triazole

https://doi.org/10.22146/ijc.90234

Fatima Haitham Zuhair⁽¹⁾, Zahraa Salim Al-Garawi⁽²⁾, Mahmoud Najim Al-jibouri^(3*), Gehad Genidy Mohamed⁽⁴⁾, Abanoub Mosaad Abdallah⁽⁵⁾

(1) Department of Chemistry, College of Science, Mustansiriyah University, Baghdad 10001, Iraq
(2) Department of Chemistry, College of Science, Mustansiriyah University, Baghdad 10001, Iraq
(3) Department of Chemistry, College of Science, Mustansiriyah University, Baghdad 10001, Iraq
(4) Department of Chemistry, Faculty of Science, Cairo University, Giza 12613, Egypt; Nanoscience Department, Basic and Applied Sciences Institute, Egypt-Japan University of Science and Technology, New Borg El Arab, Alexandria 21934, Egypt
(5) Narcotic Research Department, National Center for Social and Criminological Research (NCSCR), Giza 11561, Egypt
(*) Corresponding Author

Abstract

The work describes the synthesis and spectral investigation of cobalt(II), nickel(II), copper(II), and zinc(II) complexes with (E)-4-((4-nitrobenzylidene)amino)-5-(3,4,5-trimethoxyphenyl)-4H-1,2,4-triazole-3-thiol (L). The new ligand was synthesized through three steps, first the preparation of 3,4,5-trimethoxyphenylhydrazide salt, the ring closure of potassium hydrazide salt with excess of hydrazine hydrate followed by condensation of the derivative 4-amino-5-(3,4,5-trimethoxyphenyl)-4H-1,2,4-triazole-3-thiol with 4-nitrobenzaldehyde in glacial acetic acid. The physical and spectroscopic properties of the ligand and its complexes were well investigated and theoretically studied. The experimental results were compatible with their expected compositions. Based on the spectral data, metal complexes with coordination numbers 6 and 4 were proposed, with L functioning as a bidentate ligand. The metal complexes displayed an octahedral geometry around bivalent cobalt, nickel, and zinc tetrahedral environment. Density functional theory calculations (DFT) were conducted to investigate the geometry optimization of the synthesized ligand L and its Co(II) complex and to confirm the structure of the ligand by comparing its experimental vibrational and NMR spectra with the corresponding DFT calculated spectra. The DFT results revealed the participation of nitrogen and sulfur atoms of imine and thione groups in coordination with the metal ions beside the good agreement with the experimental data of elemental analyses and spectroscopic measurements.

Keywords

1,2,4-triazole complexes; DFT study; polydentate ligand

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DOI: https://doi.org/10.22146/ijc.90234