Silver sulfadoxinate: Synthesis, structural and spectroscopic characterizations, and preliminary antibacterial assays in vitro

Author(s)

Zanvettor, Nina T. ^[1] ; Abbehausen, Camilla ^[1] ; Lustri, Wilton R. ^[2] ; Cuin, Alexandre ^[3] ; Masciocchi, Norberto ^[4] ; Corbi, Pedro P. ^[1]

Affiliation

^[1] Univ Estadual Campinas, UNICAMP, Inst Chem, BR-13083970 Campinas, SP - Brazil

^[2] Centro Univ Araraquara, Biol & Hlth Sci Dept, BR-14801320 Araraquara, SP - Brazil

^[3] Univ Fed Juiz de Fora, Exact Sci Inst, Dept Chem, Juiz de Fora, MG - Brazil

^[4] Univ Insubria, Dipartimento Sci & Alta Tecnol, I-22100 Como - Italy

• Document type: Journal article
• Source: Journal of Molecular Structure; v. 1082, p. 180-187, FEB 15 2015.
• Web of Science Citations: 8

Abstract

The sulfa drug sulfadoxine (SFX) reacted with Ag+ ions in aqueous solution, affording a new silver(l) complex (AgSFX), which was fully characterized by chemical, spectroscopic and structural methods. Elemental, ESI-TOF mass spectrometric and thermal analyses of AgSFX suggested a {[}Ag(C12H13N4O2S)] empirical formula. Infrared spectroscopic measurements indicated ligand coordination to Ag(I) through the nitrogen atoms of the (deprotonated) sulfonamide group and by the pyrimidine ring, as well as through oxygen atom(s) of the sulfonamide group. These hypotheses were corroborated by C-13 and N-15 SS-NMR spectroscopy and by an unconventional structural characterization based on X-ray powder diffraction data. The latter showed that AgSFX crystallizes as centrosymmetric dimers with a strong Ag center dot center dot center dot Ag interaction of 2.7435(6) angstrom, induced by the presence of exo-bidentate N,N' bridging ligands and the formation of an eight-membered ring of {[}AgNCN](2) sequence, nearly planar. Participation of oxygen atoms of the sulfonamide residues generates in the crystal a 1D coordination polymer, likely responsible for its very limited solubility in all common solvents. Besides the analytical, spectroscopic and structural description, the antibacterial properties of AgSFX were assayed using disc diffusion methods against Escherichia coli and Pseudomonas aeruginosa (Gram-negative), and Staphylococcus aureus (Gram-positive) bacterial strains. The AgSFX complex showed to be active against Gram-positive and Gram-negative bacterial strains, being comparable to the activities of silver sulfadiazine. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 11/02452-0 - Synthesis, characterization and pharmacological application of platinum(II), gold(I) and silver(I) complexes with sulfadoxine
• Grantee: Nina Torres Zanvettor
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 12/08230-2 - Synthesis, characterization and pharmacological studies of Ag(I), Au(I), Pt(II) and Pd(II) complexes with bioactive ligands
• Grantee: Pedro Paulo Corbi
• Support Opportunities: Regular Research Grants