Abstract
Three silver(I) complexes, [Ag(Dppp)(2)]NO3 center dot 0.5H(2)O (1), [Ag-2(DPPP)(2)(Dmtu)(4)](NO3)(2) (2) and [Ag(PPh3)(2)(Dmtu)(2)]NO3 center dot 0.5H(2)O (3) (where Dppp = 1,3-bis(diphenylphosphano)propane, PPh3 = triphenylphosphane and Dmtu = N,N'-dimethylthiourea), were prepared and characterized by IR and NMR (H-1, C-13 and P-31) spectroscopic methods. The crystal structures of the complexes were determined by X-ray crystallography. All three complexes are ionic, containing nitrate as a counter ion. In complex 1, two Dppp ligands are coordinated to an Ag(I) ion, each acting as a chelating donor to form a six membered ring. Complex 2 is dinuclear with the individual silver(l) ions bound to two phosphorus atoms of two different Dppp ligands and two sulfur atoms of N,N'-dimethylthiourea. The geometry around the Ag(I) atoms in both complexes is distorted tetrahedral. Complex 3 is mononuclear having the silver(l) ion coordinated by two PPh3 and two Dmtu ligands in a nearly tetrahedral environment. The Dmtu ligands in complexes 2 and 3 are coordinated in a terminal mode. The complexes were evaluated for their antibacterial activity and they were found to exhibit moderate activity against most of the bacteria. (C) 2019 Elsevier Ltd. All rights reserved.