Synthesis and characterization of cobalt (II), nickel (II), copper (II) and zinc (II) complexes derived from two Schiff base ligands: Spectroscopic, thermal, magnetic moment, electrochemical and antimicrobial studies

• Published in: Inorganica Chimica Acta Vol. 467; pp. 227 - 237
• Main Authors: Orojloo, Masoumeh, Zolgharnein, Peyman, Solimannejad, Mohammad, Amani, Saeid
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2017; Elsevier Science Ltd
• Subjects: Antiinfectives and antibacterials; Antimicrobial activity; Bacteria; Blue-ray information storages; Chemical synthesis; Cobalt; Coordination compounds; Copper; Dilution; E coli; Imines; Infrared spectra; Ligands; Magnetic moment; Magnetic moments; Mass spectrometry; Metal complex; Nickel; Nitrogen; NMR; Nuclear magnetic resonance; Nuclear structure; Plates (structural members); Schiff base ligands; Thermal analysis; Zinc; Metal complex; Antimicrobial activity; Schiff base ligands; Thermal analysis; Blue-ray information storages; Magnetic moment
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/j.ica.2017.08.016

Two azo group-containing Schiff-base ligands and their complexes with Co(II), Ni(II), Cu(II) and Zn(II) cations have been synthesized. The electronic absorption spectra of the metal complexes indicate an absorption band at about 380–480nm corresponding to blue-violet light region. The compounds are suitable materials for application as optical recording media and blue-ray optical information storages. The magnetic moments of the Co(II), Ni(II), Cu(II) and Zn(II) complexes indicate that the compounds are mono-nuclear. All complexes of ligand L2 exhibited the antimicrobial activity for Staphylococcus aureus and Escherichia coli, rather than pure L2. [Display omitted] •Two azo Schiff- base were synthesized.•Allmetal complexes are found to be non-electrolyte in nature.•The UV-Vis of the metal complexes indicate an absorption band at blue- violet light region.•The complexes are suitable materials for application as optical recording media glistered for.•The ligands (L1 and L2) and synthesized metal complexes were tested for their antimicrobial activity. Two azo group-containing Schiff base ligands, namely 4-((2,4-dichlorophenyl)diazenyl)-2-(3-hydroxypropylimino)methyl)phenol (L1) and 2-((3-hydroxypropylimino)methyl)-4-(thiazol-2 yldiazenyl)phenol (L2) were prepared. The synthesis and characterization of Co(II), Ni(II), Cu(II), and Zn(II) complexes of the ligands (L1) and (L2) have been described. Elemental analyses, magnetic moment, mass spectrometry, 1H NMR, 13C NMR, electronic and infrared data suggest a mono-nuclear structure for all compounds. All these complexes have a general formula of type [M(L)2] (M=Co, Ni, Cu and Zn). The complexes are powders, insoluble in regular organic solvents but soluble in DMSO. Their probable structures have been estimated as per the basis of their spectroscopic data. The lagans show bidentate behavior in the complexes. The coordination occurs through azomethine nitrogen atom and an oxygen atom of the OH group. The infrared spectra of all complexes within the region of 540–500cm−1 and 470–420cm−1 can be assigned to M–O and M–N modes, respectively. The ligands (L1 and L2) and the synthesized complexes were tested for their antimicrobial activity against clinical isolates of Escherichia coli (the Gram-negative bacteria), Staphylococcus aureus (the Gram-positive bacteria) and Candida albicans (the fungus) using Kirby–Bauer and Micro plate dilution methods.