title: Structural, spectral, linear and nonlinear optical properties of new nonlinear optical L-histidinium trichloroacetate crystals.
abstract: Single crystals of a new histidinium salt: L-histidinium trichloroacetate {abbreviated as LHTCA; [(C(3)N(2)H(4))CH(2)CH(NH(3))(CO(2))](+)CCl(3)COO(-)} were grown by slow evaporation of an aqueous solution at room temperature. The compound crystallizes in a non-centrosymmetric space group P2(1) of monoclinic system with cell parameters a=5.4505(18) A, b=25.769(8) A, c=9.210(2) A and beta=99.98(2) degrees. The vibrational structure of the compound confirms the presence of various functional groups in the molecule. The UV-vis-NIR spectrum shows a good transparency in the whole of the region from ultraviolet to near IR. The Kurtz powder SHG measurement confirms the frequency doubling of the crystal. Thermal behaviour of the crystals has been investigated by DSC analysis. These preliminary results suggest that LHTCA crystal can act as a potential and promising candidate for frequency doubling applications even from the near UV region to the near IR.
authors.affiliation: Department of Physics, Presidency College, Chepauk, Chennai 600005, India. gokulrajs@yahoo.com
authors.forename: S Gokul
authors.initials: SG
authors.lastname: Raj
authors.forename: G Ramesh
authors.initials: GR
authors.lastname: Kumar
authors.forename: Thenneti
authors.initials: T
authors.lastname: Raghavalu
authors.forename: P
authors.initials: P
authors.lastname: Kumar
authors.forename: R
authors.initials: R
authors.lastname: Mohan
authors.forename: R
authors.initials: R
authors.lastname: Jayavel
mesh_terms: D003460:Crystallization / Q000379:methods*; D003461:Crystallography / Q000379:methods*; D006639:Histidine / Q000737:chemistry*; D008954:Models, Biological; D033362:Powder Diffraction; D019265:Spectroscopy, Near-Infrared; D013816:Thermodynamics; D014269:Trifluoroacetic Acid / Q000737:chemistry*
chemical_list: D006639:Histidine; D014269:Trifluoroacetic Acid