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Heteroleptic divalent metal complexes [M(L) (bipy)(Y)]• n H 2 O (where M = Mn, Co, Ni, and Zn; L = Schiff base; bipy = 2,2’-bipyridine; Y = OAc and  n  = 0, 1) have been synthesized from pyrimidine Schiff base ligand 3-{( E )-[(4,6-dimethylpyrimidin-2-yl)imino]methyl} naphthalen-2-ol, 2,2’-bipyridine and metal(II) acetate salts. The Schiff base and its complexes were characterized by analytical (CHN elemental analyses, solubility, melting point, conductivity) measurements, spectral (IR, UV-vis,  1 H and  13 C-NMR and MS) and magnetometry. The elemental analyses, Uv-vis spectra and room temperature magnetic moment data provide evidence of six coordinated octahedral geometry for the complexes. The metal complexes’ low molar conductivity values in dimethylsulphoxide suggested that they were non-ionic in nature. The compounds displayed moderate to good antimicrobial and antifungal activities against  S .  aureus ,  P .  aeruginosa ,  E .  coli ,  B .  cereus ,  P .  mirabilis ,  K .  oxytoca ,  A .  niger ,  A .  flevus  and  R .  Stolonifer . The compounds also exhibited good antioxidant potentials with ferrous ion chelation and, 1-diphenyl-2-picryl-hydrazyl (DPPH) radical scavenging assays. Molecular docking studies showed a good interaction with drug targets used. The structural and electronic properties of complexes were further confirmed by density functional theory calculations.

open chemistry

Synthesis, characterization,  in-vitro  antimicrobial properties, molecular docking and DFT studies of 3-{( E )-[(4,6-dimethylpyrimidin-2-yl)imino]methyl} naphthalen-2-ol and Heteroleptic Mn(II), Co(II), Ni(II) and Zn(II) complexes