Silver complexes with sulfathiazole and sulfamethoxazole: Synthesis, spectroscopic characterization, crystal structure and antibacterial assays
作者:Julia Helena Bormio Nunes、Raphael Enoque Ferraz de Paiva、Alexandre Cuin、Wilton Rogério Lustri、Pedro Paulo Corbi
DOI:10.1016/j.poly.2014.09.010
日期:2015.1
The present work describes the synthesis and spectroscopic characterization of two silver(I) complexes with the sulfonamides sulfathiazole (AgC9H8N3O2S2, Ag-SFF) and sulfamethoxazole (AgC10H10N3O3S, Ag-SFM). Elemental analyses indicate a 1:1 metal/ligand composition for both complexes. Spectroscopic techniques such as H-1, N-15 NMR and IR evidence the coordination of both ligands to silver through the nitrogen atom of the sulfonamide group, and also indicate the participation of the 5-membered N-heterocyclic ring in the coordination. The Ag-SFT crystal structure was solved by X-ray powder diffraction and indicates the formation of a dimeric structure with silver bridging between two ligand molecules. Biological studies showed the antibacterial activity of Ag-SFT and Ag-SFM complexes against Gram-positive and Gram-negative bacterial strains, with MIC values ranging from 3.45 to 6.90 mmol L-1 for the sulfathiazole complex and 1.74 to 13.9 mmol L-1 for the sulfamethoxazole complex. The complexes have shown to be more active against Gram-negative bacterial strains. (C) 2014 Elsevier Ltd. All rights reserved.