6028-27-9Relevant academic research and scientific papers
Structural, spectroscopic and nonlinear optical studies on a new efficient organic donor-acceptor crystal for second harmonic generation: L-Threoninium picrate
Natarajan,Umamaheswaran,Kalyana Sundar,Suresh,Martin Britto Dhas
, p. 160 - 163 (2010)
A new and efficient organic nonlinear optical (NLO) crystal from the amino acid family, viz., l-threoninium picrate (LTHP), has been grown by solvent evaporation technique from aqueous solution. The structure of LTHP was elucidated using single crystal X-ray diffraction data. The compound crystallized in the non-centrosymmetric space group P21 and the unit cell contains two l-threoninium cations and two picrate anions. The backbone conformation angles Ψ1 and Ψ2 are in cis and trans configurations for both the picrate and the threoninium residues. An intra-molecular hydrogen bond between the amine N atom and the nearby oxygen atom, viz., N1-H1B...O3 is observed, with a graph set motif R 11(5). The second harmonic generation (SHG) efficiency of this material was measured using Kurtz and Perry method and found to be about 43 times that of standard potassium dihydrogen phosphate (KDP) crystals. Fourier transform infrared (FTIR) and ultraviloet-visible-near infrared spectral studies were also carried out. The details are discussed.
Key aspects of L-threoninium picrate single crystal: An excellent organic nonlinear optical material with a high laser-induced damage threshold
Krishna, Anuj,Vijayan,Gupta, Shashikant,Thukral, Kanika,Jayaramakrishnan,Singh, Budhendra,Philip,Das, Subhasis,Maurya,Bhagavannarayana
, p. 56188 - 56199 (2015/02/05)
Recent trends focuses on the usage of nonlinear optical materials owing to their increasing demand in frontier areas of optical communication and switching applications. In the present work single crystal of L-threoninium picrate, an excellent material for nonlinear optical applications was grown using conventional slow evaporation solution technique to meet the increasing demand of photonics industry. The lattice parameters of the grown crystal were analysed by using powder X-ray diffraction, and it was found that it crystallised in monoclinic system with space group P21. The strain in the lattice of the grown crystal was calculated using Hall-Williamson relation. Crystalline perfection of the grown crystal was assessed using high resolution X-ray diffraction technique and observed that quality of crystal was fairly good. Optical transmission analysis and band gap evaluation were performed using UV-Vis spectroscopy. Laser damage threshold value for the crystal was also measured and was found to be higher than most of reported organic single crystals. Optical homogeneity of the crystal and birefringence was evaluated using modified channel spectrum method. Thermal behaviour of the grown specimen was examined by using photopyroelectric technique. Further its various mechanical properties, such as hardness, stiffness, young's modulus, were measured using nanoindentation technique.
