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Published: 2017

Total Pages: 0

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"The study based on thiourea derivatives has received significant interest from several disciplines due to their variable bonding modes, promising biological implications and their complexation capacity. Thiosemicarbazones are a stimulating type of ligands that reveals a diverse range of biological activities. They are effectual intermediates for the production of pharmaceutical and bioactive materials which makes them very useful in the field of medicinal chemistry. The FTIR spectral variations in the stretching frequencies of C=N, C–N and C=S that appeared at 1663, 1327 and 726 cm-1, respectively confirmed the formation of the ligand. The present study describes the preparation of (Z)-2-(pyrrolidin-2-ylidene)thiourea ligand for the synthesis of ZnS, CdS and Ag2S nanoparticles via homogeneous/chemical precipitation technique. The effect of different capping agents such as starch, PVP, PEG, PVA, and the role of ammonium hydroxide solution during the synthetic processes was investigated and distinguished. The study based on the effect of capping molecule on the formation of nanoparticles proved that the capping agent has a great influence on the formation of nanoparticles. The FTIR spectra of the capped nanoparticles revealed the shift toward the higher frequencies compared with the uncapped metal sulfide nanoparticles. The metal sulfide nanoparticles also showed an increased in energy band gaps which were different from the bulk materials." --