Zinc thiosemicarbazone complexes: Single source precursors for alkylamine capped ZnS nanoparticles

Room-Temperature Synthesis of ZnS Nanoparticles Using Zinc Xanthates as Molecular Precursors

“…The band gap energy (E g ) can be calculated using Plank's equation, E = hc/λ, where h is the Plank constant, c is the speed of light, and λ is the wavelength at the absorption maximum [5,40]. Using this approach, the E g values for samples ZnS(1) and ZnS(2) were found to be 4.05 and 4.00 eV, respectively, while bulk ZnS is known to have a band gap equal to 3.66 eV [28,42]. Generally, as a result of the quantum confinement effect, the band gap of semiconductor NPs increases with a decrease in NP size, which was indeed observed for both samples.…”

“…As an example, Liu et al reported on the use of glutathione as both ligand and sulfur source for luminescent CdS NPs with tunable color [21].Thermal decomposition of coordination compounds with S-containing ligands (such as dithiocarbamate, dithiocarbonate (xanthate), trithiocarbonate, thiosemicarbazone, and thiobiuret), which serve as sulfide sources, has already been applied to produce metal sulfide NPs with good crystallinity, narrow size distribution, and tunable dimensions [22][23][24][25]. For instance, a hot-injection route, which uses thermolysis of metal (Zn, Cd, Hg) complexes in alkylamine at 230-280 • C, was shown to lead to formation of monodispersed metal sulfide NPs wrapped with amines [26][27][28][29][30]. Interestingly, aggregates of CdS with sizes of 140-200 nm were obtained from complex Cd(ethylxanthate) 2 , while NPs with diameters of 4-7 nm were formed from diamine-ethylxanthate complex of Cd(II), indicating the protective role of strongly coordinated diamine ligand for the metal center [31].…”

Synthesis, characterization and biological studies of cobalt(II), nickel(II), copper(II) and zinc(II) complexes of vanillin-4-methyl-4-phenyl-3-thiosemicarbazone

“…[12][13][14][15] Certain thiosemicarbazones complexes were reported to have applications as nanoprecursor. 16,17 The present study reports the synthesis, characterization and biological activities of cobalt, nickel, copper and zinc complexes of vanillin-4-methyl-4-phenyl-3thiosemicarbazone. Biological activity was carried out on two Gram-positive bacteria -Staphylococcus aureus and Bacillus cereus, two-gram negative bacteria -Escherichia coli and Klebsiella pneumonia and two fungal pathogens -Aspergillus niger and Penicillium sp.…”

Synthesis and characterization of zinc di(O-2,2-dimethylpentan-3-yl dithiocarbonates) bearing pyridine or tetramethylethylenediamine coligands and investigation of their thermal conversion mechanisms towards nanocrystalline zinc sulfide

“…Metal dithiocarbonates, also known as metal xanthates, belong to this class of materials and their use for the preparation of a wide range of metal sulfides, for instance, CdS, 24,25 ZnS, 26,27 NiS, 28 SnS, 29 PbS, 30 Ga 2 S 3 , 31 Bi 2 S 3 , 32 CuInS 2 , 33,34 CuSbS 2 , 35 and Cu 2 ZnSnS 4 36 is already reported. A further beneficial property of metal xanthates as precursors is that the conversion can take place via thermal treatment in solution, 37,38 solid state reactions in a matrix, 39,40 solvent-free melt reactions [41][42][43] or aerosol assisted chemical vapour deposition (AA-CVD) processes. 44,45 Additionally, by mixing different ratios of metal xanthates, doped metal sulfides with various transition metals can be resulted and several studies showed that such systems are very useful for controlling the optical, electrical and crystalline properties.…”