The efficient acentric L-ornithine monohydrochloride (LOMHCl), which belongs to the trait of semiorganic category and depicts nonlinear optical characteristics, was grown-up by the process of slow evaporation. The crystal structure and crystallinity of LOMHCl was established by the process of single crystal and powder X-ray diffraction. Single XRD affirm that LOMHCl crystallizes in the system of monoclinic with P21 as acentric space group. The examination of FTIR was done to ascertain the existence of various functional groups in LOMHCl. UV–Vis spectral analysis substantiates its optical quality and the optical constants were also assessed. Photoluminescence process elucidates its emission characteristics and its lifetime is also determined. LOMHCl discloses exquisite resistance to laser radiation having threshold up to 2.69 GW/cm2. The SEM analysis highlights its surface topography. The mechanical stability has been attested by the analysis of microhardness and several mechanical parameters are also estimated. The investigation of dielectric characteristics of LOMHCl was also accomplished. The studies on second and third order nonlinearity were established by the method of Kurtz–Perry and Z-scan which facilitates its utility in the field of nonlinear optics. © 2018 The Physical Society of the Republic of China (Taiwan)

Sangeetha P

Chemistry

School of Advanced Sciences

Chennai Campus

Vinitha G

Physics

Nageshwari M

Kumari C.R.T

Caroline M.L.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Chinese Journal of Physics

Paracetamol-Picric acid (PP) cocrystals were grown from ethanol by slow evaporation solution growth technique. The compound C14H12N4O9 crystallizes in monoclinic system with centrosymmetric space group P21/c. The band gap energy was estimated by the application of Kubelka–Munk algorithm and the cut-off wavelength is ∼491 nm. The molecule is associated with accommodating weak C[sbnd]H⋯O, O[sbnd]H⋯O, π … π and H⋯H stacking interactions, very much responsible for the formation and strengthening of supramolecular assembly. Inter- and intramolecular hydrogen bonding interactions show supramolecular architecture in the crystal packing. Third-order nonlinear optical properties of the grown crystal were derived by employing a single beam Z-scan technique at a wavelength of 532 nm diode pumped CW Nd:YAG Laser system. Theoretical calculations were performed using density functional theory (DFT) method to derive the optimized geometry, dipole moment, polarizability and hyperpolarizability. Molecular interactions are analyzed and quantified by Hirshfeld surfaces, derived from single crystal XRD data. Fingerprint plots of Hirshfeld surfaces were used to locate and analyze the percentage of hydrogen bonding interactions. The O⋯H/H⋯O interactions mainly contribute to the observed microlevel nonlinearity. © 2019

Journal of Molecular Structure

Cocrystallization of Paracetamol-Picric acid: Hirshfeld surface analysis, supramolecular architecture and third-order nonlinear optical properties

An organic competent L-Serine (LS) single crystal which corresponds to the division of acentric category has been grown-up and harvested efficiently by the method of slow solvent evaporation. The orthorhombic structure, P212121 space group and crystallinity of LS have been ascertained employing the analysis of single crystal and powder X-ray diffraction. The existence of functional groups in LS molecule was discovered by FT-Raman and FTIR studies. The transmittance spectrum in UV–Visible profile has been utilized to proclaim its substantial optical constant and to establish its crystalline perfection by means of Urbach energy. The investigations of dielectric and ac conductivity have been employed to estimate the activation energy. To evaluate its mechanical stability, Vickers microhardness examination has been executed and significant mechanical parameters have also been assessed. The fluorescence analysis emphasis the electronic excitation and also its life time was also computed. The findings of laser damage threshold signify exquisite resistance to powerful laser radiation. Using the process of Kurtz-Perry, the efficiency of SHG for LS has been examined and it was found to be 0.84 times of standard KDP. The third order nonlinearity were checked by the approach of Z-scan and affirmed that LS exhibit two photon absorption and self-defocusing effect. The results procured in the current work declared that LS is an enticing applicant for the practicable applications in nonlinear optics. © 2018 Elsevier B.V.

Physica B: Condensed Matter

Growth and characterization of l -Serine: A promising acentric organic crystal

An organic conjugated chromophore DL-mandelic acid (DLMA) single crystal was synthesized and grown-up by means of slow evaporation technique. Single crystal X-ray diffraction study proclaimed that the DLMA crystal crystallized in monoclinic system with centrosymmetric space group P21/c. The various characteristic fundamental vibration frequencies were identified by FTIR spectroscopic studies. UV–visible spectral analysis concluded that the lower cut-off wavelength and calculated direct optical band gap of DLMA as 257 nm and 5.40 eV respectively. Thermal property of DL-mandelic acid was established through thermogravimetric and differential scanning calorimetric technique. The electric field response of DLMA crystal was investigated from the dielectric studies at a few selected temperatures and frequencies. The quantum chemical assessments such as HOMO-LUMO, molecular electrostatic potential and NLO activity were calculated and presented. In order to determine mechanical strength of DLMA crystal for various loads using Vickers microhardness tester. The real and imaginary parts of the third-order susceptibility (χ3) were evaluated with the Z-scan technique using closed and open signatures respectively and was found to be Re (χ3) = 4.15 × 10−6 esu and Im (χ3) = 0.47 × 10−6 esu. © 2017 Elsevier B.V.

Growth and characterization of dl -Mandelic acid (C 6 H 5 CH(OH)CO 2 H) single crystal for third-order nonlinear optical applications

An efficient nonlinear optical semiorganic material L-valinium L-valine chloride (LVVCl) was synthesized and grown-up by means of slow evaporation process. Single crystal XRD evince that LVVCl corresponds to monoclinic system having acentric space group P21. The diverse functional groups existing in LVVCl were discovered with FTIR spectral investigation. The UV-Visible and photoluminescence spectrum discloses the optical and electronic properties respectively for the grown crystal. Several optical properties specifically extinction coefficient, reflectance, linear refractive index, electrical and optical conductivity were also determined. The SEM analysis was also carried out and it portrayed the surface morphology of LVVCl. The calculated value of laser damage threshold was 2.59 GW/cm2. The mechanical and dielectric property of LVVCl was investigated employing microhardness and dielectric studies. The second and third order nonlinear optical characteristics of LVVCl was characterized utilizing Kurtz Perry and Z scan technique respectively clearly suggest its suitability in the domain of optics and photonics. © 2017 Elsevier B.V.

Growth, spectral, linear and nonlinear optical characteristics of an efficient semiorganic acentric crystal: L-valinium L-valine chloride

Optically active single crystals of L-phenylalanine D-methionine (LPDM) were grown by slow evaporation technique by co-crystallization of amino acids L-phenylalanine and D-methionine in water. The unit cell dimensions have been identified from single crystal X-ray diffraction technique. The existences of various hydrocarbyls were examined by FTIR and FT-Raman spectroscopy. The carbon and hydrogen environment of the grown crystals were analyzed by FT NMR spectrum. The optical absorption studies show that the crystal is transparent in the visible region with a lower cut-off wavelength of 259 nm and there by optical band gap energy Eg is calculated to be 5.35 eV. The Urbach energy, extinction coefficient, reflectance were calculated from UV-absorption data. Further, the thermal stability and accurate melting point has been investigated by TG/DSC techniques. The Kurtz powder SHG was confirmed using Nd:YAG laser with fundamental wavelength of 1064 nm. The dielectric behavior of the specimen has been determined for various temperatures (313 K, 333 K, 353 K, 373 K) at different frequencies. Fluorescence study and the time resolved decay calculation was also performed for the LPDM crystal. Optical nonlinear susceptibility was measured in LPDM and the real and imaginary part of χ3 was evaluated by Z-scan technique using open and closed apertures. © 2017 Elsevier B.V.

Growth and characterization of an efficient new NLO single crystal L -phenylalanine D -methionine for frequency conversion and optoelectronic applications

Materials Chemistry and Physics

Investigation on unidirectional growth of 1,3,5-Triphenylbenzene by Sankaranarayanan-Ramasamy method and its characterization of lifetime, thermal analysis, hardness and etching studies

Third order nonlinear optical, spectral, dielectric, laser damage threshold, and photo luminescence characteristics of an efficacious semiorganic acentric crystal: L-Ornithine monohydrochloride

Journal	Data powered by TypesetChinese Journal of Physics
Publisher	Data powered by TypesetElsevier BV
ISSN	0577-9073
Open Access	No