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Synthesis, structures, and antimicrobial activities of two cobalt(II) complexes [Co(L1)2(OH2)2] and [Co(L2)2]

Yong-Jun Han, Li Wang, Qing-Bin Li, Ling-Wei Xue

Abstract


A new cobalt(II) complex, [Co(L1)2(OH2)2] (1), was prepared by the reaction of 3-bromo-5-chlorosalicylaldehyde (HL1) with cobalt nitrate in methanol. Reaction of 1 with cyclopropylamine in methanol afforded the Schiff base cobalt(II) complex, [Co(L2)2] (2), where L2 is the deprotonated form of 2-bromo-4-chloro-6-(cyclopropyliminomethyl)phenol (HL2). The complexes have been characterized by elemental analyses, IR spectroscopy, and single-crystal X-ray diffraction. The L1 ligand coordinates to the Co atom through the phenolate O and carbonyl O atoms, while the L2 ligand coordinates to the Co atom through the phenolate O and imino N atoms. The Co atom in complex 1 adopts octahedral coordination and that in complex 2 adopts tetrahedral coordination. The effect of the free ligands and the cobalt complexes on the antimicrobial activities against Staphylococcus aureus, Escherichia coli, and Candida albicans was studied.


Keywords


Synthesis; Crystal structure; Antimicrobial; Schiff base; Cobalt complex

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DOI: http://dx.doi.org/10.17344/acsi.2016.3019

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Copyright (c) 2017 Yong-Jun Han, Li Wang, Qing-Bin Li, Ling-Wei Xue

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