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| Synthesis, Spectroscopic Characterization, Thermogravimetric and Biological Activity Evaluation of Te(Ⅳ), Se(Ⅳ), V(Ⅲ), Nb(Ⅴ), Ta(Ⅴ) Complexes With Indole-3-Acetic Acid Plant Hormone Ligand |
| Jehan Y. Al-Humaidi1, Foziah A. Al-Saif1, Dalal N. Binjawhar1, Hanan A. Bakhsh1，Moamen S. Refat2* |
1. Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, Riyadh 11671, Saudi Arabia
2. Department of Chemistry, Faculty of Science, Taif University, Al-Haweiah 21974, Taif, Saudi Arabia |
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Abstract Te(Ⅳ), Se(Ⅳ), V(Ⅲ), Nb(Ⅴ) and Ta(Ⅴ) complexes of indole-3-acetic acid (IAAH) ligand were synthesized, characterized by elemental analysis and various spectroscopic techniques like, IR, 1H-NMR, X-ray powder diffraction, UV-Visible, thermogravimetry analysis, magnetic measurements, molar conductance and surface morphology using SEM. All the synthesized complexes of IAAH ligand have 1∶2 stoichiometry of the types [Te(IAA)2(NH3)2]·2Cl (Ⅰ), [Se(IAA)2(NH3)2]·2Cl (Ⅱ), [V(IAA)2(NH3)(Cl)] (Ⅲ), [Nb(IAA)2(Cl)3] (Ⅳ), and [Ta(IAA)2(Cl)3] (Ⅴ). Spectral analysis indicates octahedral geometry for the Te(Ⅳ), Se(Ⅳ) and V(Ⅲ) complexes, whereas both Nb(Ⅴ) and Ta(Ⅴ) have a seven-coordination. The bonding sites are the oxygen atoms of carboxylate group for the deprotonated indole-3-acetic acid (IAA) ligand. The thermogravimetry analysis studies gave evidence for the presence of other coordinated molecules (Cl or NH3) in the composition of IAA complexes, which were further supported by IR and micro analytical measurements. The higher molar conductance data of tellurium and selenium (Ⅳ) complexes reveal that these chelates are electrolytes, while low conductivity values for the vanadium(Ⅲ), niobium and tantalum(Ⅴ) chelates indicated a non-electrolytes. To test the antibacterial property of the five complexes in this study, four bacterial strains Klebsiella (G-), Escherichia coli (G-), Staphylococcus aureus (G+) and Staphylococcus epidermidis (G+) were used in the investigation. The effects of the five complexes in the cytotoxicity of Caco-2 and Mcf-7 human cancer cell lines were studied Neutral red uptake assay for the estimation of cell viability/cytotoxicity protocol.
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Received: 2020-02-16
Accepted: 2020-06-10
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Corresponding Authors:
Moamen S. Refat
E-mail: msrefat@yahoo.com
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