Growth and characterization studies on L-threoninium p-toluenesulfonate monohydrate crystal
L-threoninium p-toluenesulfonate monohydrate (LTPTM) (IUPAC name: 1-carboxy-2-hydroxypropan-1-aminium 4-methylbenzenesulfonate monohydrate), a new organic nonlinear optical (NLO) crystal, is grown by solution growth method at room temperature. It crystallizes in monoclinic crystal system with noncentrosymmetric space group P2{sub 1}. Presence of NH{sub 3}{sup +} and SO{sub 3}{sup −} vibrations in IR and Raman spectra confirms the formation of LTPTM molecule. The {sup 1}H and {sup 13}C nuclear magnetic resonance (NMR) spectra establish the molecular structure. In the {sup 1}H–NMR spectrum of LTPTM, the chemical shift corresponding to H-SO{sub 3} (6.57 ppm) of p-toluenesulfonic acid monohydrate is absent. This is due to the fact that the hydrogen in H–SO{sub 3} is released and combines with the amine group of L-threonine. This ensures the formation of LTPTM molecule. The O5-H5A…O3 intermolecular interaction is also established by the observed upfield shift of COOH group in LTPTM molecule. The crystal is thermally stable up to 73 °C. LTPTM is transparent from 235 to 1100 nm. The second harmonic generation (SHG) conversion efficiency of LTPTM is 0.77 times that of KDP. Third order nonlinear optical susceptibility (χ{sup (3)}) of the title crystal is 1.3035 × 10{sup −7} esu which is higher than some reported NLO crystals.
- OSTI ID:
- 22950285
- Journal Information:
- Optical and Quantum Electronics, Vol. 51, Issue 5; Other Information: Copyright (c) 2019 Springer Science+Business Media, LLC, part of Springer Nature; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); ISSN 0306-8919
- Country of Publication:
- United States
- Language:
- English
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