l-Phenylalaninel-phenylalaninium bromide – a new nonlinear optical material

Abstract

L-Phenylalanine L-phenylalaninium bromide (LPLPB), an amino acid non-centrosymmetric crystal having a large second harmonic generation (SHG) efficiency, being 4.5 times that of KH 2 PO 4 (KDP), has been successfully grown using a slow evaporation method employing a temperature gradient technique. The structure of the grown crystal was solved and refined by single-crystal X-ray diffraction, and this demonstrates that it belongs to a monoclinic system with the space group P2 1 . The confirmation of its functional groups was recorded using Fourier transform infrared spectroscopy. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) were used to study its thermal properties. The optical behaviour was examined and its optical constants were determined by UV-vis analysis. Dielectric spectroscopy reveals the dielectric nature of the grown crystal. The mechanical strength of the grown LPLPB was estimated by microhardness studies, and the Young's modulus of the grown LPLPB was calculated to be 3.310 × 10 10 N m −2 .

Self-assembled kanamycin antibiotic-inorganic microflowers and their application as a photocatalyst for the removal of organic dyes

“…The characteristic bands at 564 and 635 cm −1 are assigned to the O = P-O bridging phosphorous, and confirm the presence of phosphate groups 32 . In the FTIR spectrum of the kanamycin-Cu 3 (PO 4 ) 2 hybrid flowers (red line), while the characteristic peaks at 1153, 1095, 1000, 635 and 564 cm −1 demonstrate the presence of the Cu 3 (PO 4 ) 2 , the bending vibration at 1208 cm −1 can be assigned to phenyl ring-carbon sketching 33 , which further confirms the presence of kanamycin molecules within the hybrid flowers. Furthermore, no obvious new characteristic peaks are observed in the FTIR spectrum of kanamycin-Cu 3 (PO 4 ) 2 hybrid flowers, confirming the self-assembly pathway to form the flower structures, instead of covalent bonding.…”

Crystal growth, spectral, optical, laser damage, photoconductivity and dielectric properties of semiorganic l-cystine hydrochloride single crystal

“…The dielectric constant and dielectric loss decrease with increasing frequency and attains a constant value in the higher frequency region [24]. The low dielectric loss at high frequency of the grown crystal shows that this crystal possesses good optical quality and this parameter is of vital importance for numerous NLO materials and their applications [20,25].…”

“…The dielectric property of ionic crystals in the low frequency region depends on the crystal structure, electronic and atomic polarizability of constituent ions [20]. The dielectric constant ( ) r ε of the crystal was calculated using the following relation, Fig.5a and Fig.5b.…”

Growth and Characterization of Semiorganic Non-linear Optical Material: (((4-aminophenyl)sulphonyl)oxy)zinc(II)chloride Crystal

“…This method is a non-destructive one and will quickly yield quantitative information about the strength of materials. The experiment was carried out using SHIMADZU HMV microhardness tester fitted with the diamond pyramidal indenter [51][52][53][54][55][56]. Figures 16 and 17 are the obtained Vickers microhardness graphs of the grown 4-ASZC crystal.…”

“…It indicates that the grown crystal belongs to the soft nature of material. The yield strength of the material can be elucidated by the relation [56][57][58].…”