A new approach in the design of polar crystals for quadratic nonlinear optics exemplified by the synthesis and crystal structure of 2-amino-5-nitropyridinium dihydrogen monophosphate (2A5NPDP)

A new organic monohydrogenmonophosphate (C 5 . The structure was solved, using the direct methods and refined against F 2 to a reliability R factor of 0.0257. H HPO .(H O)− . The third hydrogen bond type is responsible for the cohesion between the two-dimensional polyanions. Thus, a framework in a threedimensional way is then created. The thermal decomposition of MPAP shows a large endothermic effect corresponding to the elimination of the water molecules and a set of endotherms which are probably due to the evolution of ammonia from the structure and the decomposition. The title compound was also characterized by IR spectroscopy, the interpretation of the spectra is based on theoretical analyses and literature data.

Section: Ir Spectroscopy Investigationsmentioning

confidence: 99%

Crystal structure, thermal analysis and IR spectroscopy investigations of N, N‐dimethyl‐1,3‐propanediammonium monohydrogenmonophosphate trihydrate

Chtioui

Jouini

2003

“…Urea, one of the simplest biological molecules, with L-malic acid possesses a second harmonic generation efficiency that is roughly three times greater than that of an inorganic compound KDP [2][3]. Generally anions were introduced in molecular salt compositions to provide alignment of the molecules [4]. Growth and characterisations of calcium malate and strontium malate have also been reported earlier [5][6].…”

Section: Introductionmentioning

confidence: 96%

Vibrational, optical and microhardness studies of trimethoprim DL ‐malate

Franklin

Bhuvana

Balasubramanian³

2009

Trimethoprim malate, an organic crystal, has been synthesized using slow evaporation method from its aqueous solution. Structural, optical and the mechanical properties of the grown crystal have been investigated by various characterization techniques which include FTIR spectra, single crystal XRD, UV-Vis spectra and Vickers microhardness testing. The structure of the compound predicted by analysing the recorded FTIR spectrum compliments the structure determined using single crystal X-ray diffraction. Single crystal X-ray diffraction study reveals that the crystals are monoclinic [P2 1 /c, a=12.9850 Å, b=9.3038 Å, c=15.6815 Å and β=111.065°]. The UV-Vis spectrum exhibits maximum transparency (98%) for a wide range suggesting the suitability of the title compound for optical applications. The optical constants have been calculated and illustrated graphically. Microhardness tests have been performed on the cystal under study and the Vicker hardness number has been calculated. The work hardening coefficient is found to be 2.85 which suggest that the crystal belongs to the family of soft materials.

“…Molecular salts composed of a cation with high molecular hyperpolarizability and a counter-ion have been reported [2], in which the anion was introduced to provide alignment of the molecules for urea L (+) tartaric acid [3,4], urea (DL) tartaric acid [5], urea L-malic acid [6,7] also been reported. Among these materials, organic salts crystallized non-centro symmetric packing, e.g., amino acids, DAST etc [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Optical and mechanical properties of a new second order nonlinear optical crystal urea l‐threonine

Jaikumar¹,

Kalainathan

2008

A new second order non-linear optical organic crystal Urea L-threonine has been grown by aqueous solution slow cooling technique. The grown crystal is non hygroscopic and transparent in the visible region. The solubility of the grown crystal was found. The crystal structure and perfection were determined using powder XRD and High resolution XRD. The molecular structure was confirmed by 1 H-NMR spectrum. Thermal properties of the crystal have been studied using thermogravimetric (TG) and differential thermal analysis (DTA). The dielectric response of the crystal with varying frequencies at different temperatures was studied. UV-Visible spectrum was recorded to study the optical transparency of the grown crystals. The second order non linear optical property was examined by Kurtz powder technique and found that the second order susceptibilities is 1.2 KDP at wavelength 1064 nm. The mechanical behaviour was studied by Vickers Microhardness test. The results are discussed in detail.