Organic nonlinear optical 2-methylquinolinium
L-malate single crystals have been grown by slow evaporation solution growth
technique from a mixture of 2-methylqiunoline and L-malic acid in ethanol
solution at ambient temperature. Single crystal X-ray diffraction analysis
reveals that grown crystal in monoclinic system with non-centrosymmetric space
group P21 and the lattice parameters are a = 7.35 Ǻ, b = 26.51 Ǻ, c = 10.83 Á,
α = γ = 90° β = 102.95º and V = 2057.4 Ǻ3. UV-vis spectrum indicates that the
crystal is transparent (75%) in the entire visible region with a cut-off
wavelength of 437 nm and optical energy band gap Eg is found to be 2.71 eV.
Microhardness measurement reveals the mechanical strength of the grown crystal.
The photoluminescence spectrum shows the blue emission of the crystal. Laser
damage threshold studies was carried out to ascertain the suitability of grown
crystal for laser applications.The relative second harmonic generation
efficiency of 2-methlquinolinium L-malate crystal was found to be two times
greater than that of KDP.
Source:IOPscience
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