Synthesis, structure, growth and physical properties of a novel organic NLO crystal: 1,3-Dimethylurea dimethylammonium picrate

A novel noncentrosymmetric crystal was prepared from 1,3-dimethylurea dimethylammonium picrate, C11H18N6O8 (DMUP), which was designed for second harmonic generation. DMUP crystals exist in noncentro symmetric space group Cmc21 with unit cell dimensions a = 14.288(4) Å, b = 17.023(5) Å, c = 6.8268(13) Å, α = β = γ = 90° and volume = 1660.5(8) Å3. The crystal structure of DMUP has been determined using single crystal X-ray diffraction studies. The single crystals of DMUP were successfully grown by the slow evaporation method with dimensions 10 mm × 4 mm × 3 mm using dimethylformamide as solvent. The structural perfection of the grown crystals has been analysed by High-resolution X-ray diffraction (HRXRD) rocking curve measurements. Powder test with Neodymium-doped Yttrium aluminum garnet (Nd:YAG) laser radiation shows a high second harmonic generation (SHG). The laser induced surface damage threshold for the grown crystal was measured using Nd:YAG laser.

1,3-Dimethylurea dimethylammonium picrate is identified as potential candidate for efficient frequency conversion.Figure optionsDownload as PowerPoint slideResearch highlights▶ A new organic crystal, 1,3-dimethylurea dimethylammonium picrate, crystal has been grown for the first time and reported. ▶ The structure is reported for the first time in the literature. ▶ The high resolution X-ray diffraction curve (DC) measurements substantiate the good quality of the crystals. ▶ Powder test with Nd:YAG laser radiation shows a high second harmonic generation. ▶ Single shot and multiple shot (50 pulses) surface laser damage thresholds are determined to be 0.42 GW/cm2 and 0.31 GW/cm2 at 532 nm laser radiation, respectively.