2-Amino-6-methylpyridinium nitrophenolate nitrophenol

Journal of Thermal Analysis and Calorimetry - Organic co-crystals fashioned with two or more different constituents through intermolecular non-covalent interactions (hydrogen and halogen bonds)...     

Synthesis,optical, thermal and second harmonic generation studies of pure,urea and thiourea doped organic l-tartaric acid–nicotinamide (LTN) crystals

Nonlinear optical pure, urea and thiourea doped LTN crystals have been successfully grown from aqueous solution using slow evaporation technique. XRD analysis has been carried out to determine the lattice parameters of the pure and doped LTN crystals. The grown crystals were characterized by thermogravimetric analysis (TGA), differential thermal analysis (DTA), energy dispersive x-ray analysis (EDX) analysis and UV–vis–NIR spectroscopy. The fundamental modes of pure and doped crystals have been qualitatively assigned by FTIR analysis. The hardness of the grown crystals has been assessed and the results show the minor variation in the hardness value for the pure and doped LTN samples. Furthermore, second harmonic generation (SHG) measurements conducted indicate that the efficiency of thiourea doped LTN is 4.2 times greater than that of the KDP crystals and is suitable for frequency conversion applications.     

An initial study of the growth and defect analysis on hydrated 2-benzoyl benzoic acid crystal

In the present study, single crystals of hydrated 2-benzoyl benzoic acid were grown by the slow evaporation solution growth method. Single crystal and powder X-ray diffraction studies confirm the triclinic structure of the grown crystals. The defect in crystalline perfection has been defined by rocking curve analysis. The FTIR spectrum of the crystal displays carbonyl stretching of the carboxylic group at 1685 cm^?1 and of keto group at 1661 cm^?1. It shows a merged medium band around 3450 cm^?1 due to OH stretching and does not distinguish clearly between OH of COOH and H₂O held up in the crystal. The existence of additional bands appears at 1590 cm^?1 due to vibration of H₂O in the compound. The photoluminescence excitation studies were carried out for the grown crystals for wide wavelength range between 300 nm and 700 nm at room temperature. The range of percentage of optical absorption of the crystal has been ascertained by UV?vis spectral characterization. The mechanical strength has been determined by Vickers's microhardness measurement for different loads with constant dwell time.     

Influence of organic dyes on the thermal,mechanical, and optical properties of l-arginine trifluoroacetate (LATF) single crystals

Bulk single crystals of pure and organic dyes (rhodamine, amaranth, and methyl orange) admixture l-arginine trifluoroacetate were grown by slow evaporation technique. The cell parameters and crystallinity of pure and dyes-mixed LATF were confirmed by powder X-ray diffraction analysis. Thermal analysis (TG/DTA, DSC) reveals the purity of the sample and no decomposition is observed up to melting point. In the TG trace of pure LATF, methyl orange: LATF, amaranth: LATF and rhodamine: LATF it is observed that the crystals were thermally stable up to 488, 485, 483, and 484.14 K, respectively. The crystals are further characterized using UV–Vis analysis, microhardness analysis, and EDAX analysis. By plotting log P versus log d, the value of the work hardening coefficient "n" was found to be 1.95, 0.52, 0.8, and 0.88 for pure, methyl orange, amaranth, and rhodamine dyes-doped LATF grown crystals, respectively. Second harmonic generation efficiency of pure and dye admixture LATF crystals was measured using Kurtz and Perry powder test, the efficiency of methyl orange, amaranth, and rhodamine dyes-doped LATF crystal is 2.7, 2.6, and 2.07 times greater than KDP, where as the efficiency of LATF pure is 2.5 times greater than that of KDP.