Synthesis, characterization, crystal structure and antibacterial activity of new sulfur-bridged dinuclear silver(I) thiosemicarbazone complex [Ag2(PPh3)2(μ-S-Brcatsc)2(η1-S-Brcatsc)2](NO3)2

•Brcatsc ligand acts as μ-S- and η1-S- in this complex.•The silver(I) ions in this complex have slightly distorted tetrahedron geometry.•This complex has shown significant antibacterial activity against gram-positive bacteria.

In this paper, a new sulfur-bridged dinuclear silver(I) thiosemicarbazone complex [Ag2(PPh3)2(μ-S-Brcatsc)2(η1-S-Brcatsc)2](NO3)2 was synthesized by the reaction of silver(I) nitrate with 2-bromo-3-phenylpropenalthiosemicarbazone (Brcatsc) in the presence of triphenylphosphine (PPh3) (1:1:2 M ratio). The complex was characterized by elemental analyses (CHNS), FT-IR and 1H & 13C NMR spectroscopy and structurally characterized by single-crystal X-ray diffraction analysis. X-ray result showed that the Brcatsc acted as a neutral ligand coordinated to the silver(I) ion in two different bonding modes (μ-S- and η1-S-). The Ag⋯Ag separation in the Ag(μ-S)2Ag core is 3.699(2) Å. One P atom from PPh3 ligand and three S atoms from one η1-S and two μ-S bonding modes of Brcatsc ligands coordinate to the Ag atom is a form of distorted tetrahedron. In addition, the antibacterial activity of the complex against two gram-positive (Staphylococcusaureus and Enterococcusfaecalis) and two gram-negative (Escherichiacoli and Pseudomonasaeruginosa) bacteria was studied.

Graphical abstractNew sulfur-bridged dinuclear silver(I) thiosemicarbazone complex [Ag2(PPh3)2(μ-S-Brcatsc)2(η1-S-Brcatsc)2](NO3)2 has been prepared and characterized. X-ray result has shown that the complex is dinuclear and silver(I) ion is coordinated by three S atom of three Brcatsc and one P atom of PPh3 in a distorted tetrahedral geometry. The antibacterial effect of the complex against two gram-positive (S. aureus and E. faecalis) and two gram-negative (E. coli and P. aeruginosa) bacteria was studied.Figure optionsDownload full-size imageDownload as PowerPoint slide