Preparation, spectral characterization and antibacterial studies of silver(I) complexes of 2-mercaptopyridine and thiomalate

Abstract

Silver(I) complexes of 2-mercaptopyridine (Mpy), [Ag(Mpy)]NO3and [Ag(Mpy)2]NO3, and the first mixed-ligand complex having a thione and thiolate coordinated to Ag(I), [Mpy–Ag–Tm] (Tm═thiomalate) have been prepared and characterized by IR and NMR spectroscopy. The1H and13C NMR spectra show the presence of both ligands in the mixed-ligand complex, [Mpy–Ag–Tm]. An upfield shift is observed in the >C═S resonance of Mpy and C═O resonances of thiomalate in13C NMR, while the other resonances are shifted downfield. The complexes showed relatively high antibacterial activity (inhibition zone of 6–11 mm) against a gram +ve bacterium,Bacillus subtilis, as compared to that (inhibition zone of 4 mm) against a gram –ve bacterium,Escherichia coli.

Synthesis, spectral characterization and antibacterial studies of palladium(II) complexes of heterocyclic thiones

“…The antibacterial activities of the complexes are due to a direct interaction of metal ions with biological ligands such as proteins, enzymes and membranes [57][58][59]. The antibacterial activity of Pd(II) complexes may be attributed to their tendency to undergo further ligand replacement reactions with the biological ligands such as proteins and DNA.…”

Synthesis, Spectral, Structural and Antimicrobial Studies of Silver Nanoparticles and Ag(I) Complex of 2-Mercaptobenzothiazole

“…Ultra-violet spectrophotometer in the range (200-1000) on Shimadzu UV-Vis 160 Shimadzu 680cc-flame was used to obtained the atomic absorption measurements of the prepared complex .The values of magnetic susceptibility were obtained at room temperature using Magnetic Susceptibility Balance Bruke Magnet B.M. [6]. Conductivity measurements were carried out by WTW conductivity meter .…”

“…The silver(I) complex plays an important role as carrier for the silver(I) ion to the biological system [5,6]. Antimicrobial nanoparticles basically comprise of metal, metal oxide and numerous biologically derived materials [7].…”

Reactions of MoOCl4 and MoO2Cl2 with Heterocyclic Thioamides

“…Absorption of terminal Mo=O group [45][46][47] (983 cm -1 ) is observed. 3209 cm -1 peak in [2] implies the presence of N-H functional group.…”

“…There is positive shift of C-S frequency to 760 cm -1 due to increase in C-S bond order. Absorption of terminal Mo=O group [45][46][47] (974 cm -1 ) is observed. Table 3 shows N-H stretching peak (3139 cm -1 ) in [3] of 4-phenylimidazole-2-thiol 39,[52][53][54] .…”