Growth and characterization of a new organic nonlinear optical crystal: Vanillylideneaniline

Vanillylideneaniline with chemical formula C14H13NO2 (VAN), a second order nonlinear optical (SONLO) organic single crystal was synthesized and grown for the first time from dimethyl formamide (DMF) employing slow solvent evaporation technique. Single crystal X-ray diffraction data reveals that the crystal belongs to noncentrosymmetric orthorhombic space group C222(1). The high-resolution diffraction curve containing single peak with full width at half maximum (FWHM) of 62 arcs ascertains VAN was perfectly crystallized and free from structural grain boundaries. The formation of the material was confirmed quantitatively by MIR, H-1(1) and C-13 NMR spectral analyses. The UV-vis-NIR spectrum reveals the percentage of the transmission of VAN crystal in the entire region. The variations of dielectric constant (epsilon(r)) and dielectric loss (D) with frequency at different temperatures were investigated. The SHG of VAN crystal is confirmed by Kurtz Powder technique. The mechanical strength of the crystal was estimated by Vickers hardness test. VAN has yield strength of 8.70 MPa. Thus the grown organic VAN single crystal can be recommended as a promising candidate for SONLO application and device fabrication technology

Microhardness, Dielectric and Photoconductivity studies of 2-Amino 5-Nitro Pyridinium Nitrate NLO Single crystals

Abstrac

2-Amino-5-nitropyridinium hydrogen oxalate

In the cation of the title molecular salt, C5H6N3O2+·C2HO4−, the dihedral angle between the aromatic ring and the nitro group is 3.5 (3)°; in the anion, the dihedral angle between the CO2 and CO2H planes is 10.5 (2)°. In the crystal, the anions are linked into [100] chains by O—H...O hydrogen bonds. The cations cross-link the chains by way of N—H...O hydrogen bonds and the structure is consolidated by C—H...O interactions

Synthesis, growth and characterization of nitramino sulphonic acid (NASA) NLO single crystals

New laser NLO (nonlinear optical) inorganic material nitramino sulphonic acid (NASA) [H2N2SO5] was synthesized and confirmed by NMR and XRD spectral analysis. NASA crystal was grown from aqueous solution by slow solvent evaporation technique at room temperature. Single crystal XRD revealed that NASA crystallizes in noncentrosymmetric space group P-ba2. The structural purity was confirmed by powder XRD. The crystalline perfection of the grown crystal was analyzed by High resolution XRD. The optical transmittance and band gap energies of the crystal were studied by UV-vis-NIR spectral analysis. Polarizability factors attributing to dielectric properties were analyzed by dielectric studies. Second harmonic generation efficiency was also studied by Kurtz-Perry powder technique. Explosive sensitive destable nitramino bond was converted to optically energetic by stabilizing N-NO2 bond within sulphonic acid host molecules

Ultrasonic Studies of Binary Liquid Mixtures: Ethyl Acetate + 2-Butanone

ABSTRACT Binary liquid mixtures of Ethyl acetate + 2-Butanone at various mole fractions were prepared. The molecular interactions between the binary mixtures were analyzed by ultrasonic measurements using interferometer method. The densities of pure liquid mixtures were elucidated by relative measurement method. The mole fractions of Ethyl acetate and 2-Butanone were found to be 98.50 and 98.06 respectively. The FTIR spectrum shows a drastic change in the frequency for 0.6 mole fraction of Ethyl acetate and 0.4 mole fraction of 2-Butanone. The shift in the frequency values might be due to interstitial accommodation or induced dipole interaction