Crystallises In Triclinic System Research Articles

Impact of Barium cationic mixing on Cadmium and Strontium oxalate crystals

Barium mixed Cadmium oxalate crystal (BMCO) and Barium mixed Strontium oxalate crystal (BMSO) were grown by single test tube gel technique using polymerized silica gel. Complexes of Cd+2–Ba2+ ions and Sr+2–Ba2+ ions in a controlled nucleation centres of gel media, stimulated the formation of BMCO and BMSO crystals. Resulted crystals are colourless, hard, transparent and exist in diamond like appearance. The grown mixed crystals were characterized using Energy dispersive x-ray spectroscopic (EDX) analysis, Fourier transform infrared (FT-IR) spectral studies, thermo-gravimetric (TG) studies and Powder x-ray diffraction (P-XRD). Investigation on BMCO crystal identified Cd+2–Ba2+ ions cluster, matrix of coordinated water and crystalline water and good thermal stability with hexagonal crystalline nature. BMSO crystal associated with Sr+2–Ba2+ ions complex, crystalline water, high thermal stability and crystallises in triclinic system. UV-visible spectroscopic studies determined band gap energies, transparency to visible light and insulating behaviour of the mixed crystals. Electrical conductivity measurements of the mixed crystals elucidated linear growth of conductivity with temperature. Both mixed oxalate crystals exhibit high dielectric constant values. Impact of Ba2+ ions diffusion into the lattices of BMCO and BMSO crystals were compared and discussed.

Structural and optical properties of a new organic crystal 3-(2-chloro-5-(trifluoromethyl) phenyl)-1-(3,4-dimethoxyphenyl)prop-2-en-1-one for nonlinear optical applications

A new organic nonlinear optical material 3-(2-chloro-5-(trifluoromethyl)phenyl)-1-(3,4-dimethoxyphenyl)prop-2-en-1-one(3-CPDP) has been crystallized from CCl4. 3-CPDP crystallises in triclinic system with P1 space group. The crystal is optically transparent throughout the visible region with an absorption cut-off wavelength at 442 nm and possesses a stable phase before the melting point temperature (154 °C). The 3-CPDP molecule exhibits a minimum nonlinear transmittance at focus for 532 nm laser wavelength. The nonlinear absorption coefficient (β), excited state absorption cross section (σex) and ground state absorption cross section (σg) are estimated and found to be 1.78 cm/GW, 8.59 × 10−18 and 1.99 × 10−21 cm2, respectively.

Synthesis, characterisation and structural aspects of a new diorganotin(IV) complex with N′-(5-bromo-2-hydroxybenzylidene)benzoylhydrazone ligand

A new diorganotin(IV) complex, Me2Sn[5-Br-(2-OC6H4CH=N–N=C(O)Ph)] (1) has been synthesised from dimethyltin(IV) dichloride and a Schiff base derived from 5-bromosalicylaldehyde and benzoyl hydrazide. The complex has been characterised by elemental analysis, and FT-IR and NMR spectroscopies. Molecular structure has been confirmed by single-crystal X-ray diffraction analysis. Complex 1 crystallises in triclinic system, space group P-1 (no. 2) with a=7.562(6), b=9.980(8), c=11.899(8) A; α=81.08(6)°, β=72.71(5)°, γ=79.64(6)°; Z=2. The ligand N′-(5-bromo-2-hydroxybenzylidene)benzoylhydrazone (H2L) coordinates to the metal centre in enolate form via the phenolic O, imino N and enolic O atoms. The central tin atom is in distorted trigonal bipyramidal geometry with two oxygen atoms of the ligand in axial positions, while the imino nitrogen atom of the ligand and two methyl groups on tin occupy the equatorial sites.