Synthesis, characterization and structural study of new nickel(II) and mercury (II) complexes with imidazole oxime ligand

In this work, we reported the experimental study of two new complexes named bis[chloro(1-methyl-1H-imid-azole-2-carbaldehyde oxime) Nickel(II) {Ni(L)2Cl2} (I) and Di-mu-chloro-bis[chloro(1-methyl-1H-imidazole-2-carbaldehyde oxime) mercury(II) {Hg2(L)2Cl4}, DMF (II) based on (1-methylimidazole-2-aldoxime, L). The synthesis, crystallization, and characterization were detailed. Complex I display a hexa-coordinated compound with a distorted octahedral geometry. The NiII ion is coordinated to two ligands in bidentate mode through nitrogen atoms. Complex II has one unique HgII atom and forms a dimeric complex that contains two HgII atoms related by a crystallographic inversion center. In this complex, the oxime ligand is ligated to the metal ion in a monodentate fashion through the nitrogen atoms. On the basis of bond distances, this complex exhibits a dis-torted tetrahedral geometry around each mercury center metal. The complexes are analyzed using single-crystal diffraction, FT-IR, NMR, and UV-visible. Cyclic voltammetry was also used to understand the electrochemical behavior of the ligand and both complexes. Furthermore, we have performed DFT calculations to get more about the spectral electronic transitions' nature, reactivity, and electronic structure of the ligand and complexes.