Complexes of tetraethylthiuram disulphide with group 12 metals: single-source precursor in metal sulphide nanoparticles’ synthesis

Abstract

Six new complexes of Zn(II), Cd(II) and Hg(II) with sulphur containing ligand, tetraethylthiuram disulphide in 2:2 and 1:4 ratio have been synthesized. The resulting complexes have been characterized on the basis of molar conductance measurement, elemental analyses, FT-IR, 1 H-NMR, and FAB/ESI-mass studies. The complexes were used as a single-source precursor for the synthesis of ZnS/CdS/HgS nanoparticles by their thermal decomposition in the presence of different surfactants. The precursor:surfactant ratio and temperature play an important role in determining the size of the nanoparticles. The size and morphology of nanoparticles have been ascertained by ultra violet-visible spectroscopy, X-ray diffraction measurements and transmission electron microscopy. Schiff bases, complexes and nanoparticles were tested for antibacterial activity and minimum inhibitory concentration values against Escherichia coli. The complexes were found more potent than the corresponding Schiff bases and nanoparticles.

Synthesis, Characterization, In Vitro Anti-diabetic, Antibacterial and Anticorrosive Activity of Some Cr(III) Complexes of Schiff Bases Derived from Isoniazid

“…The other complexes show less activity. However, other complexes exhibit less antibacterial activity 29 . The activity order of the synthesized compounds was as follows: S2> S3> S4> S1> L 1 > and L 2 .…”

Studies on Benzylidene/Dibenzylidene Thiosemicarbazide Complexes of Zn(II), Cd(II) and Hg(II): Single Source Precursor in Pyrolytic Synthesis of Quantum Dots

“…Agar well diffusion method was used for antibacterial screening as discussed earlier 15,16 . The results in form of inhibition zone, measured in mm are presented in Table 2.…”

“…The most popular method for MIC evaluation, commonly used in clinical laboratory is successive dilution method as discussed earlier [15][16][17] . MIC is concentration of the higher dilution tube, in which bacterial growth was absent and results are presented in Table 2.…”

“…their size, distribution and shape 16 . The TEM image of ZnS nanoparticles ( Figure 13) shows quite well-defined particles with narrow size distribution between 4.08 nm to 7.04 nm with a mean particle size of 5.9 nm (c.f.…”

“…It is postulated that improved activity arises from the delocalization of positive charge between the organic moiety and the metal, which favours the drug entering into normal cellular processes of the bacteria. The increased activity of metal complexes can also be explained on the basis of 'Overtone's concept' and 'Chelation theory' 16 .…”