The main purpose of the study was the development of a new method for synthesis of 1,3,4-thiadiazol-2-amine derivatives in a one-pot manner using the reaction between a thiosemicarbazide and carboxylic acid without toxic additives such as POCl3 or SOCl2. The reaction was investigated in the presence of polyphosphate ester (PPE). It was found that, in the presence of PPE, the reaction between the thiosemicarbazide and carboxylic acid proceeds in one-pot through three steps with the formation of corresponding 2-amino-1,3,4-thiadiazole. Using the developed approach five, 2-amino-1,3,4-thiadiazoles were synthesized. The structures of all compounds were proven by mass spectrometry, IR, and NMR spectroscopies.
The effect of bath temperature (60-90 °C) on structural, optical and electrical properties of CdS thin films deposited by chemical bath deposition (CBD) at a constant precursor concentration and deposition time was studied. From the XRD analysis, it was found that the structure of CdS thin fi lms varied with temperature. At lower temperature hexagonal structure was dominated while at high temperature, the cubic structure was prominent. The band gap of the as-prepared CdS thin fi lms was calculated from the UV-Vis spectroscopic data, and it was found to be decreased with the increase of temperature. The resistivity of the CdS thin fi lms also decreased with the increase in temperature.
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