Growth and characterization of semiorganic crystal potassium hydrogen oxalate
Single crystals of potassium hydrogen oxalate (KHO), a semiorganic nonlinear optical material, were grown from aqueous solution by slow evaporation solution growth technique at room temperature. The cell parameters of KHO were determined using single crystal X-ray diffraction and the crystal system was identified as monoclinic. The suitability of this material for nonlinear optical application was studied by UV–Vis spectral study and the second harmonic generation efficiency measurement by Kurtz–Perry powder method. The nature of coordination and the functional groups present were investigated by the Fourier transform infrared spectrum. The thermal stability of the crystal was analyzed by thermogravimetric and differential thermal analysis. Vickers microhardness test was carried out on the growth crystal to assess its mechanical stability.
KeywordsSlow evaporation Single crystal XRD FTIR SHG TG–DTA
The authors express their gratitude to ACIC, St. Joseph’s College, Trichy, SAIF Cochin, and B.S. Abdur Rahman University, Chennai, India, for spectral studies, Single crystal XRD analysis, mechanical, thermal, and NLO studies.
- 1.Wang XQ, Xu D, Yuan DR, Tian YP, Yu WT, Sun SY, Yang ZH. Synthesis, structure and properties of a new nonlinear optical: zinc cadmium tetrathiocyanate. Mater Res Bull. 1999;34:2001–11.Google Scholar
- 2.Prasad PN, Williams DJ. Introduction to nonlinear optical effects in molecules and polymers. New York: Willey; 1991.Google Scholar
- 3.Chemla DS, Zyss J. Nonlinear optical properties of organic molecules and crystals, vol. 1. New York: Academic Press; 1987.Google Scholar
- 21.Jung YM. Characterization of pH-dependent IR spectra of oxalic acid: comparison of self modelling curve resolution analysis with calculation of IR frequencies. Bull Korean Chem Soc. 2003;24(9):1410.Google Scholar
- 22.Silverstein RM, Webster FX. Spectroscopic Identification of organic compounds. 6th ed. New York: Wiley; 1998.Google Scholar
- 23.Herzberg G. Infrared and Raman spectra of polyatomic molecules. New York: Van Nostran Reenhold; 1945.Google Scholar
- 24.Nakamot K. Infrared and Raman spectra of inorganic and coordination compounds. New York: Wiley & Sons; 1986.Google Scholar
- 27.Mayer E. Contribution to the knowledge of hardness and hardness testing. Z Ver Dtsch Ing. 1908;52:645–54.Google Scholar
- 28.Onitsch EM. Mikroscopia. 1947;2:131–4.Google Scholar