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Bull Mater Sci (2020)43:270 https://doi.org/10.1007/s12034-020-02241-0

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Synthesis, structural, crystal growth, electrical and mechanical properties of potassium 4-methyl benzene sulphonate C AMIRTHAKUMAR1, B VALARMATHI1, G CHAKKARAVARTHI2 and R MOHAN KUMAR1,* 1

Department of Physics, Presidency College, Chennai 600 005, India Department of Physics, CPCL Polytechnic College, Chennai 600 068, India *Author for correspondence ([email protected]) 2

MS received 10 September 2019; accepted 8 April 2020 Abstract. Semi-organic crystal of potassium 4-methyl benzene sulphonate (KOPT) was grown by slow evaporation solution growth technique. Structural parameters of the grown crystal were obtained by single-crystal X-ray diffraction analysis. It reveals that the crystal belongs to monoclinic system and crystallized in noncentrosymmetric space group P21. The vibrational frequencies of corresponding functional groups in the compound were analysed by Fourier-transform infrared and FT-Raman spectroscopy. 1H and 13C NMR spectral analyses have been carried out to confirm the molecular structure of the grown crystal. The thermal properties of KOPT were evaluated by thermogravimetric analysis/differential scanning calorimetry measurements. Ultraviolet–Visible spectral studies revealed the cut-off wavelength, transparency and corresponding bandgap (4.5 eV) of KOPT crystal. The dielectric and mechanical characteristics were studied to test the KOPT crystal for nonlinear optical applications. Keywords.

1.

Semi-organic material; spectral studies; thermal property.

Introduction

In the past few decades, researchers concentrated their research in finding new organic, inorganic and semi-organic compounds for various applications, such as signal processing in integrates optics, optical switching, optical communication, sensors, light emitting diodes, optical limiting device, photo-switch, military technology, as well as terahertz (THz) generation [1]. In the innovative time, photons in the fastest mode are used to transmit the information in optical communication with speed of light, which encourages the researcher to investigate the new nonlinear optical (NLO) materials [2]. The NLO materials are being discovered with high nonlinear susceptibility in organic compounds, and advantages of organic compounds are easy to synthesize, possibility of multifunctional substitutions. However, they have inadequate transparency, moderate optical quality, low value of laser damage threshold, and inability to grow large size. Inorganic crystals of lattice ions give low contribution in second harmonic generation (SHG), the reason is that it has lack of delocalized p-electrons. Even though inorganic materials have good mechanical stability with non-toxicity, they have high melting point compared with organic materials. In semi-organic compounds, organic ligands are ionically bonded with inorganic host, so that it enhances the nonlinearity [3]. The semi-organic compounds acquired properties

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