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Original Articles

Syntheses, characterizations, X-ray crystal structures, and antibacterial activities of Co(II), Ni(II), and Zn(II) complexes of the Schiff base derived from 5-nitro-2-hydroxybenzaldehyde and benzylamine

, , , , &
Pages 616-631 | Received 28 Jun 2014, Accepted 10 Nov 2014, Published online: 06 Jan 2015
 

Abstract

Three new complexes, [CoIIL2(bzln)2] (1), [NiIIL2(DMF)2] (2), and [ZnIIL2] (3), with the bidentate (NO) Schiff base HL = 2-((E)-(benzylimino)methyl)-4-nitrophenol have been synthesized and characterized. [CoIIL2(bzln)2] (1) was initially formed from the reaction of H2L1 (N,N′-bis(5-nitrobenzaldehyde)-2-aminobenzylamine = H2L1), with CoII(CH3COO)2·4H2O in the presence of benzylamine. The X-ray crystal structure of 1 revealed that HL was formed from the hydrolysis of H2L1 and the recondensation of benzylamine with 2-hydroxy-5-nitrobenzaldehyde produced in H2L1 hydrolysis. The Schiff base HL was then prepared by direct reaction of 2-hydroxy-5-nitrobenzaldehyde and benzylamine. Complexes 1–3 were also directly synthesized and their crystal and molecular structures determined by X-ray crystallography. The ligand and its metal complexes were also screened for in vitro antibacterial activity.

Acknowledgments

Partial support of this work by the Isfahan University of Technology Research Council is gratefully acknowledged. The X-ray center of the Vienna University of Technology is acknowledged for providing access to the single-crystal diffractometer.

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