In the recent past organic nonlinear optical single crystals were found to be suitable material for NLO applications because of its large nonlinear optical coefficients and high laser damage threshold compared to those of inorganic materials. Among the many well known nonlinear optical (NLO) materials, the organic salt of hippuric acid was found to be potential material for NLO applications. Its crystal structure was determined by Ringertz [1], found that the crystal belongs to orthorhombic crystal system and noncentrosymmetric in nature. The growth of hippuric acid single crystal by conventional slow evaporation solution growth method has already been reported [2]. In the present report, we have grown the title compound of hippuric acid by recently invented Sanakaranarayanan-Ramasamy method [3] using glass as the crucible. It has the unique advantage of 100% solution-crystal conversion is possible by this method. To the best of our knowledge there is no report is available on the growth of hippuric acid by unidirectional solution growth and this is the first report to the literature. The seed crystal was carefully prepared and mounted in the bottom of the V shaped glass crucible. The concentrated solution was prepared using dimethyl formamide (DMF) as the solvent. The filtered solution was decanted into the crucible, and it was fully closed with thick perforated plastic cover with hole at the centre. The whole experimental setup was housed into the constant temperature bath (CTB). Then the experimental condition was carefully observed and found that the seed crystal was started growing after 15 days. After a period of 40-45 days a good quality single crystal of HA was harvested from the glass crucible. Then the harvested specimen was cut and polished for the characterization analysis. The lattice dimensions and crystalline perfection were evaluated from the single crystal XRD and HRXRD analyses. The presence of C,H and N were identified from the elemental analysis. The optical behavior was assessed by UV-Vis. Analysis. The results will be presented in detail.

[1]. H. Ringertz, Acta Crystallogr. B 27 (1971) 285.

[2]. N.Vijayan, R.Ramesh Babu, R.Gopalakrishnan, P.Ramasamy, M.Ichimura and

M.Palanichamy, J. Crystal Growth, 273 (2005) 564.

[3]. K.Sankaranarayanan and P.Ramasamy, J. Crystal Growth, 280 (2005) 467.

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