Bulk crystal growth and nonlinear optical characterization of a stilbazolium derivative crystal: 4-[2-(3,4-dimethoxyphenyl)ethenyl]-l methylpyridinium tetraphenylborate (DSTPB) for NLO device fabrication

Senthil, K.; Kalainathan, S.; Hamada, Fumio; Kondo, Yoshihiko

doi:10.1039/c5ra14186a

Cited by 45 publications

(6 citation statements)

References 83 publications

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“…The theoretical study of quantum chemical calculations and molecular dynamic simulations was performed to further verify and quantify the presence of intermolecular interactions found between G-C NADES components. The molecular electrostatic potential (MEP) surface diagram was used to detect electron density distributions of the molecule in term of color grading . The negative region (deepest blue) was for the nucleophilic site whereas the positive region (deepest red) was for potential electrophilic centers as shown in Figure A.…”

Section: Resultsmentioning

confidence: 99%

“…The molecular electrostatic potential (MEP) surface diagram was used to detect electron density distributions of the molecule in term of color grading. 31 The negative region (deepest blue) was for the nucleophilic site whereas the positive region (deepest red) was for potential electrophilic centers as shown in Figure 3A. Positive regions of citric acid were located on the H atoms of the −COOH group and −OH group, whereas those of glucose were located on the H atoms of the −OH group.…”

Section: Methodsmentioning

confidence: 98%

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Highly Efficient Deamidation of Wheat Gluten by Glucose-Citric Acid-Based Natural Deep Eutectic Solvent: A Potential Effective Reaction Media

Cao

Zheng

Chen

et al. 2021

J. Agric. Food Chem.

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An efficient technique using citric acid and glucose based natural deep eutectic solvent (G-C-NADES) was developed to obtain ultrahigh deamidated wheat gluten (UDWG) (deamidation degree (DD) > 90%). FTIR and 1 H NMR indicated intensive hydrogen bonds (HBs) in G-C-NADES supermolecules. Quantum chemical calculations and molecular dynamic simulations demonstrated that 10 wt % diluted G-C-NADES still had a myriad of HBs. Physicochemical results showed UDWG had DD up to 92.45% after G-C-NADES deamidation, that is, 22% higher than citric-acid-DWG with a weak degree of hydrolysis (1.75%). Conformational characterization demonstrated the obvious conversion from α-helix to β-sheet via FTIR, the least amount of disulfide bonds by Raman spectra, and more exposure of tryptophan residues by fluorescence measurement for UDWG. It is proven that enhanced accessible conformation of WG reached with HBs of G-C-NADESs could contribute to the improvement on nucleophilic attack of deamidation, declaring that G-C-NADES might be a potential solvent for obtaining an ultrahigh deamidation for WG to successfully guarantee the safety of wheat gluten based cereal food regarding to lowering its allergy.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 98%

Highly Efficient Deamidation of Wheat Gluten by Glucose-Citric Acid-Based Natural Deep Eutectic Solvent: A Potential Effective Reaction Media

Cao

Zheng

Chen

et al. 2021

J. Agric. Food Chem.

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“…The optical path length of the Z -scan measurement was found to be 675 mm. The sample thickness is less than the Rayleigh length ( Z R ) that satisfies the basic criteria ( L ≪ Z R ) for Z -scan analysis …”

Section: Methodsmentioning

confidence: 99%

“…The sample thickness is less than the Rayleigh length (Z R ) that satisfies the basic criteria (L ≪ Z R ) for Z-scan analysis. 40 In order to find the difference in OL response of 2A5NPDP single crystals grown by conventional and modified SR method grown crystals, the OL experiment was carried out using CW semiconductor diode laser operated at 532 nm under identical experimental conditions. Cut and polished crystals with similar orientation were subjected to the analysis with an identical L of 1.2 mm.…”

Section: Crystal Growth and Designmentioning

confidence: 99%

Evaluation of Linear and Nonlinear Optical Properties of D−π–A Type 2-Amino-5-Nitropyridinium Dihydrogen Phosphate (2A5NPDP) Single Crystal Grown by the Modified Sankaranarayanan–Ramasamy (SR) Method for Terahertz Generation

Vediyappan¹,

Chaudhary

Venkatesh

et al. 2019

Crystal Growth & Design

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We report the growth process and linear and nonlinear optical characterization of high quality improvised semiorganic 2A5NPDP single crystal using the modified SR method for the first time. The major difficulties for the growth of 2A5NPDP single crystal have been resolved with the aid of a temperature lowering method. After optimization of the growth conditions, a transparent 2A5NPDP single crystal was harvested with a size of 85 mm length and 10 mm diameter over a period of 60 days. The growth rate of the modified SR method grown crystal was found to be 10 times higher than that of the conventional slow evaporation solution technique (SEST) grown crystal. The unit cell parameters of the grown crystal were ascertained by the single crystal X-ray diffraction (SXRD) and powder X-ray diffraction (PXRD) techniques. The high crystalline perfection of the crystal was ascertained by using a high-resolution X-ray diffraction (HRXRD) technique. The presence of multifarious functional groups of the 2A5NPDP crystal were confirmed by Fourier transform infrared (FT-IR) and Fourier transform Raman (FT-Raman) spectral analyses. The thermal property was assessed by the thermogravimetric (TG) and differential thermal analysis (DTA). It shows that the grown crystal withstands temperature up to 175 °C. UV–vis–NIR analysis was used to measure the linear optical property while third-order nonlinear optical properties were ascertained using Z-scan and optical limiting (OL) techniques. The optical limiting threshold of conventional method grown crystal is 5.7 mW/cm2, whereas the modified SR method grown crystal is 4.7 mW/cm2. Low value of limiting threshold indicates that the grown crystal has minimum defects. Finally, 800 nm wavelength of 140 fs at 80 MHz repetition rate obtained from a Ti:sapphire oscillator was used for the terahertz (THz) generation between 0.1 and 2.1 THz range. The efficiency of the generated THz signal was measured using another 800 nm wavelength of 40 fs, at 1 kHz repetition rate obtained from a Ti:sapphire amplifier. The generated THz signal is separated out from unconverted 800 nm using Teflon filters, and power is measured using a pyrometer. The maximum conversion efficiency of generated THz signal is on the order of 0.63 × 10–5%.

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“…Second harmonic radiation generated by the randomly oriented microcrystals were focused by a lens and detected by the photomultiplier tube. The efficient responses for SHG mainly depend on the particle size, field-gain coefficient, the power of the fundamental beam, and the minimum beam waist [29].…”

Section: Kurtz and Perry Powder Technique For Shg Efficiencymentioning

confidence: 99%

Molecular Structures and Second-Order Nonlinear Optical Properties of Ionic Organic Crystal Materials

et al. 2016

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Abstract:In recent years, there has been extensive research and continuous development on second-order nonlinear optical (NLO) crystal materials due to their potential applications in telecommunications, THz imaging and spectroscopy, optical information processing, and optical data storage. Recent progress in second-order NLO ionic organic crystal materials is reviewed in this article. Research has shown that the second-order nonlinear optical properties of organic crystal materials are closely related to their molecular structures. The basic structures of ionic organic conjugated molecules with excellent nonlinear optical properties are summarized. The effects of molecular structure, for example, conjugated π electron systems, electronic properties of donor-acceptor groups, and different counter-anion effects on second order NLO properties and crystal packing are studied.

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Bulk crystal growth and nonlinear optical characterization of a stilbazolium derivative crystal: 4-[2-(3,4-dimethoxyphenyl)ethenyl]-l methylpyridinium tetraphenylborate (DSTPB) for NLO device fabrication

Abstract: The search for organic crystals with highly efficient nonlinear optical (NLO) properties with a high surface laser damage threshold (LDT) has become more of a demand in the frontier areas of optical switching and communications applications.

Cited by 45 publications

References 83 publications

Highly Efficient Deamidation of Wheat Gluten by Glucose-Citric Acid-Based Natural Deep Eutectic Solvent: A Potential Effective Reaction Media

Highly Efficient Deamidation of Wheat Gluten by Glucose-Citric Acid-Based Natural Deep Eutectic Solvent: A Potential Effective Reaction Media

Evaluation of Linear and Nonlinear Optical Properties of D−π–A Type 2-Amino-5-Nitropyridinium Dihydrogen Phosphate (2A5NPDP) Single Crystal Grown by the Modified Sankaranarayanan–Ramasamy (SR) Method for Terahertz Generation

Molecular Structures and Second-Order Nonlinear Optical Properties of Ionic Organic Crystal Materials

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