https://doi.org/10.1051/epjap/2010033
Characterization of a newly synthesized organic nonlinear optical crystal: benzoyl valine
1
Department of Physics, Presidency College, Chennai, 600005, India
2
Department of Materials Science & Engineering, National Chiao Tung University, Hsinchu, 300, Taiwan
3
Department of Physics, L.N Government College, Ponneri, 601204, India
4
Department of Chemistry, St. Xavier's College, Palayamkottai, 627002, India
5
Department of Physics, St. Xavier's College, Palayamkottai, 627002, India
Corresponding author: dpremanand@yahoo.co.in
Received:
15
September
2008
Revised:
1
September
2009
Accepted:
1
February
2010
Published online:
26
March
2010
Herein the synthesis and the crystal growth of benzoyl valine (BV), an organic nonlinear optical (NLO) material for frequency conversion was grown by slow evaporation solution growth technique at room temperature has been reported. The compound was prepared by Stockman method of benzoylation. The solubility curve shows linear nature up to a temperature of 313 K. XRD study reveals that the crystal belongs to monoclinic system with P21 non-centrosymmetric space group. The fundamental vibrational frequency of various functional groups (400-4000 cm-1) in the crystal was determined from FTIR analysis. 1H and 13C NMR spectral studies reveal the presence of proton and carbon network in the grown crystalline sample. The optical behaviour of the crystal was ascertained by optical UV absorption spectral studies. The UV cut off region (λmax) lies around 200 nm and the crystal is absolutely transparent from 220–800 nm suggesting its application as NLO material. The thermal stability of the crystal was determined by thermogravimetric and differential thermal analyses. Laser damage threshold of BV was found to be 0.34 GW/cm2 and hence BV can be used in frequency doubler system. Photoconductivity study of BV revealed negative photoconductiviting nature of the sample. The microhardness studies confirm that BV has a moderate Vickers hardness number (VHN) value in comparison to the other organic NLO crystals.
© EDP Sciences, 2010
