Bulk size growth, FT-NMR, FT-IR and thermal studies of TTPI single crystal

In the present work, bulk size (20 mm × 16 mm × 7 mm) single crystal of tetrakis thiourea potassium iodide [K(N2H4CS)4I]; (TTPI) has been grown from an aqueous solution using simple slow evaporation solution growth (SEST) technique. The XRD results proved that the compound crystallizes in tetragonal crystal system. The FT-IR spectrum of TTPI has clearly identified the functional groups of thiourea in the resulting compound. The chemical shift observed at 182.04 ppm of FT-NMR profile has clearly established the one type of carbon atom which is due to the incorporation of thiourea in TTPI. The TGA–DTA studies revealed that the sample undergoes weight loss in two major decomposition stages. Further, DSC study indicates that there is no adsorbed water of crystallization in the sample and the sample is found to be stable up to the melting point 197.9 °C, which is comparable to the value (193.2 °C) as indicated in the DTA peak. It is also inferred that the melting point of TTPI is far better than ATZC (58 °C), CMTG (100 °C), CMTD (150 °C), BTCoC (110 °C) and comparable to CMTC (198.5 °C) and TMTM (199.06 °C).