Experimental determination of metastable zone width, induction period, interfacial energy, growth and SHG efficiency of N-[(propan-2-ylidene) amino] thiourea

Abstract

N-[(propan-2-ylidene) amino] thiourea an organic crystal which is grown by solution growth technique by adopting slow evaporation method from the solvent methanol.Nucleation parameters such as metastable zone width, induction period and interfacial energy have been determined for N-[(propan-2-ylidene) amino] thiourea single crystals. The induction period was measured at various super saturations and hence the interfacial energies were evaluated. Using the interfacial tension value, the nucleation parameters such as radius of the critical nuclei(r*), the Gibbs free energy for the formation of a critical nucleus (ΔG*) and the number of molecules in the critical nucleus (i*) were also calculated for methanol at two different temperatures. The effect of surface tension, viscosity and density of these solvents are correlated with interfacial tension. FT-IR studies confirm the structure and presence of functional groups in the grown crystals. The optical transparency was examined by UV-Spectral analysis. The grown crystal was examined by X-ray diffraction to determine its crystalline nature. Second harmonic generation efficiency of the powdered N-[(propan-2-ylidene) amino] thioureawas tested using Nd:YAG laser and it is found to be 1.8 times that of potassium dihydrogen phosphate.