Mechanochemical synthesis of Ni(II)-tptz complexes with co-ligands: Spectroscopy, DFT, and biological studies

Authors

• Deepak Senapati
• Anulipsa Priyadarshini
• Debadutta Samal
• P. Ramesh Babu
• Satyanarayan Sahoo
• Narayan Chandra Bera
• Raghabendra Samantaray
• Jagannath Panda
• Rojalin Sahu

Publication Date

2025

Abstract

New mixed-ligand Ni(II) complexes [Ni(tptz)(1,10-phen)] (1), [Ni(tptz)(2-Mimd)2] (2), and [Ni(tptz)Imd)2] (3) were synthesized via a green, solvent-free mechanochemical approach using ball milling. The primary ligand used was 2,4,6-tris(2-pyridyl)-1,3,5-triazine (tptz), with secondary ligands being 1,10-phenanthroline, 2-methyl imidazole, and imidazole, respectively. Structural characterization by IR, UV-Visible, photoluminescence spectroscopy, and powder X-ray diffraction, supported by DFT calculations, revealed a distorted square planar geometry for complex 1 and distorted tetrahedral geometries for complex-2 and complex-3. Notably, bathochromic shifts in the UV-Vis spectra confirm metal-ligand charge transfer transitions and extended π-delocalization. Powder XRD analysis determined average crystallite sizes of 17.86 nm (1), 25 nm (2), and 14.7 nm (3). DNA-binding studies against calf thymus DNA exhibited bathochromic and hypochromic shifts, indicating an intercalative binding mode. Antibacterial evaluation showed that complexe-2 and complex-3 exhibited enhanced activity against Bacillus subtilis and Escherichia coli, with inhibition zones up to 16 mm, compared to their uncoordinated ligands. These results highlight the potential of Ni(II) coordination complexes as bioactive agents.

DOI

10.55713/jmmm.v35i2.2324

First Page

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Last Page

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Recommended Citation

Senapati, Deepak; Priyadarshini, Anulipsa; Samal, Debadutta; Babu, P. Ramesh; Sahoo, Satyanarayan; Bera, Narayan Chandra; Samantaray, Raghabendra; Panda, Jagannath; and Sahu, Rojalin (2025) "Mechanochemical synthesis of Ni(II)-tptz complexes with co-ligands: Spectroscopy, DFT, and biological studies," Journal of Metals, Materials and Minerals: Vol. 35: No. 2, Article 17.
DOI: 10.55713/jmmm.v35i2.2324
Available at: https://digital.car.chula.ac.th/jmmm/vol35/iss2/17