Crystal Research and Technology
Cryst. Res. Technol. 42, 195 (2007) - Abstract -

Studies on the structural, thermal and optical behaviour of solution grown organic NLO material: 8-hydroxyquinoline

N. Vijayan, G. Bhagavannarayana, K. K. Maurya, S. Pal*, S. N. Datta*, R. Gopalakrishnan**, and P. Ramasamy***

Materials Characterization Division, National Physical Laboratory, New Delhi – 110 012, India
*Solid State Laser Division, LASTECH, Metcalfe House, New Delhi – 110 054, India
**Dept. of Physics, Anna University, Chennai – 600 025, India
***SSN College of Engineering, Kalavakkam, Chennai – 603 110, India

Keywords growth from solution, single crystal growth, nonlinear optic materials, organic compounds, X-ray diffraction, characterization
PACS 81.10.Dn, 81.10.-h, 42.70.Mp, 61.66.Hq, 61.10.Nz, 03.67.Mn
DOI 10.1002/crat.200610796

Single crystal of 8-hydroxyquinoline (8HQ) having chemical formula C9H7NO, an organic nonlinear optical (NLO) material has been successfully grown by slow evaporation solution growth technique at room temperature. The crystal system has been confirmed from the powder X-ray diffraction (PXRD) analysis. The crystalline perfection was evaluated by high resolution X-ray diffractometry (HRXRD). From this analysis we found that the quality of the crystal is quite good. However, a very low angle (tilt angle 14 arc sec) boundary was observed which might be due to entrapping of solvent molecules in the crystal during growth. Its optical behavior has been examined by UV-Vis. analysis, which shows the absence of absorbance between the wavelengths ranging from 400 to 1200 nm. From the thermal analysis it was observed that the material exhibits single sharp weight loss starting at 113°C without any degradation. The laser damage threshold was measured at single shot mode and the SHG behavior has been tested using Nd:YAG laser as a source.




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