Synthesis, Characterization, Antimicrobial and Antifungal Activities of Mn(II) and Zn(II) Complexes with Azo Dye of 2-aminobenzimidazole and Indole

Abstract

Azo dye namly 3-[2-(benzimidazolyl)azo]-indole (BIAI) derived from diazonium salt of 2-aminobenzimidazole and indole is reported and characterized based on IR, Proton nuclear magnetic resonanc (1H-NMR), elemental analyses, mass spectroscopy, X-ray diffraction (XRD) diffraction, electronic spectra. The BIAI was utilized to form Mn(II) and Zn(II) complexes. The complexes of BIAI ligands were identified via distinctive techniques (infrared, UV-vis, mass spectroscopies, molar conductance, Nuclear magnetic resonance (NMR) spectroscopy, X-ray diffraction (XRD) diffraction and magnetic sensitivity). The Mn(II) and Zn(II) complexes were characterized as octahedral complexes and non-electrolytic under the common formula [M(BIAI)2Cl2]. The BIAI and its complexes showed interesting antimicrobial activity against two sorts of bacterial strains, Staphylococcus aureus, Escherichia coli and Aspergillus niger fungi. The metal chelates of the BIPA ligand are non-electrolytes, according to molar conductance data. BIAI is coordinated to metal ions as a bidentate manner, according to IR spectra, with NN donor atoms of azomethine–N and methoxy–O. The BIPA ligand exhibited important chromic properties under pH changes.