This might be due to the overlap of the acetate exactly ions with C�CN bond stretching vibrations. The presence of multiple bands in the region 552�C672cm?1 can be attributed to the S�CCd�CO interactions.Figure 3Superimposed TG/DTG curves of [Cd(detu)2(OOCCH3)2]?H2O. 3.3. Thermogravimetric StudiesThermogravimetric analysis of the compound, [Cd(detu)2(OOCCH3)2]?H2O, has been carried out to study the pyrolysis pattern in the temperature range 20�C800��C. From the thermogram (TGA/DTG) in Figure 3, the complex undergoes two decomposition stages. The first decomposition occurs between 24��C and 78��C with a mass loss of 3.5%; and the second decomposition starts at 114��C and ends at 233��C with a 71% mass loss. This huge mass loss corresponds to the loss of the ligands and formation of CdS.

The DTG peak temperature, for each of the decomposition stages are 61��C and 186��C, respectively. Considering the DTG peak temperatures, the first decomposition stage is due to entrapped solvent molecule. Thermal decomposition of related thiourea complexes reported in the literature has indicated that the residue formed corresponds to the formation of CdS [22]. Here, the weight of the residue calculated for CdS (3.68mg) agrees favourably with the expected (3.65mg). The DTA curve shows two pronounced endothermic peaks. The first and sharp peak is due to the melting of the complex at a temperature of 145��C. The second broad endothermic minimum which occurs at 182��C represents the decomposition of the complex. Comparing the TG curve with the DTA, it could be inferred that the second decomposition which gave CdS commenced in the liquid phase after the melting of the sample.

3.4. Synthesis and Characterization of NanoparticlesHDA-capped CdS nanoparticles were synthesized at 150��C using the cadmium complex. Optical properties of the nanoparticles were investigated by UV-vis and photoluminescence spectroscopy at room temperature (Figure 4) and show CdS nanoparticles with excitonic features at 420nm and emission at 559nm. The CdS nanoparticles showed quantum size effect which is manifested as a blue shift in their absorption band edges in comparison to that of the bulk. Figure 4Absorption and photoluminescence spectra of the HDA-capped nanoparticles.The cadmium complex produced particles in the hexagonal phase with XRD patterns (Figure 5) indexed to 111, 200, 220, 311, and 331 for peaks with 2�� values of 26.

4, 35.8, 43.9, 51.6, and 70.5, respectively. The peaks are generally broad, indicative of nanoscale particles. The TEM image of the CdS nanoparticles is presented in Figure 6. The nanoparticles are almost spherical in shape. A little aggregation Carfilzomib is observed which could be ascribed to the effect of the small dimensions and high surface energy associated with nanodimensional particles. The sizes of the nanoparticles ranged between 5 and 19nm.