Kalainathan S

Department of Physics

School of Advanced Sciences

Vellore Campus

Jagannathan K

Bhagavannarayana G.

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

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

A new interesting third-order nonlinear (NLO) organic material Pyrrolidinium 3-nitrophthalate (PY3N) is synthesized by water solvent in an equimolar ratio by room temperature solution growth technique. The crystal system (monoclinic), space group (P21/c and lattice constants (a = 13.245 (9) Å, b = 11.775 (7) Å, c = 8.612 (5) Å, β = 99.265 (2)°) were obtained from single crystal XRD. The vibrational and NMR spectral analyses confirmed the different functional groups and chemical environment of molecules present in the crystal lattice. The UV-vis study showed the crystal has good transparency with band gap and the index of refraction displays the normal dispersion behavior. The crystal demonstrates moderate surface tolerance to laser power (4.887 GW cm-2). The non-linear parameters were estimated by Z-scan technique. We have investigated the second order hyperpolarizability 'γ' of PY3N crystal with electric field and frequency by using HF method with 6-311++g(d, p) level. The theoretical third order susceptibility (3) value is 0.196 × 10-6 esu. The experimental (3)value is 3.131 × 10-6 esu. The effective optical limiting action is directed by PY3N crystal. The crystal is identified as a soft material from hardness measurement. The PY3N crystal has thermal stability (189 °C) which is identified using thermal analysis. The thermal activation energy (77.286 kJ mol-1) is determined from TGA data. The good quality of the crystal is confirmed from the intense photoluminescence peak. The etching study revealed the elongated square pattern on the developed crystal surface. © 2018 IOP Publishing Ltd.

Materials Research Express

Insight on the growth, mechanical, optical and thermal studies of pyrrolidinium 2-carboxy 6-nitrophthalate (PY3N) single crystal-An effective third-order nonlinear optical material for optical limiting applications

The organic third-order non-linear optical crystal HSPI, a new derivative of the stilbazolium family, was successfully synthesized and the optical quality single crystal was grown by a slow evaporation technique for the first time.

RSC Advances

Investigation on the growth, structural, HOMO–LUMO and optical studies of 1-ethyl-2-[2-(4-hydroxy-phenyl)-vinyl]-pyridinium iodide (HSPI) – a new stilbazolium derivative for third-order NLO applications

Optical Materials

Synthesis, growth, structural and HOMO and LUMO, MEP analysis of a new stilbazolium derivative crystal: A enhanced third-order NLO properties with a high laser-induced damage threshold for NLO applications

4-Chloro 4-nitrostilbene (CONS) a new organic nonlinear optical material has been synthesized. Employing slow evaporation method, good optical quality single crystals (dimensions up to 6×2×3 mm(3)) have been grown using ethyl methyl ketone (EMK) as a solvent. The grown crystals have been subjected to various characterizations such as single crystal X-ray diffraction, powder XRD, Fourier Transform Infrared spectroscopy (FTIR), proton NMR, solid UV absorption, SHG studies. Single crystal X-ray diffraction reveals that the crystal system belongs to monoclinic with noncentrosymmetric space group P21. The UV-Vis absorption spectrum has been recorded and found that the cut off wavelength is 380 nm. Functional groups and the structure of the title compound have been confirmed by FTIR and (1)H NMR spectroscopic analyses respectively. Molecular mass of the CONS confirmed by the high resolution mass spectral analysis .The thermal behavior of the grown crystal has been studied by TG/DTA analysis and it shows the melting point is at 188.66 °C. Dislocations and growth pattern present in the grown crystal revealed by the etching study. The mechanical strength of the CONS crystal has been studied by Vicker's hardness measurement. The SHG efficiency of the grown crystal has been determined by Kurtz and Perry powder test which revealed that the CONS crystal (327 mV) has 15 times greater efficiency than that of KDP (21.7 mV).

Synthesis, growth, structural, spectral, thermal, chemical etching, linear and nonlinear optical and mechanical studies of an organic single crystal 4-chloro 4-nitrostilbene (CONS): A potential NLO material

Synthesis, growth, structural, optical, spectral, thermal and mechanical studies of 4-methoxy 4-nitrostilbene (MONS): A new organic nonlinear optical single crystal

Journal of Crystal Growth

Mechanical and surface analysis of stilbazolium tosylate derivative crystals

Crystal Research and Technology

Growth and characterization of a novel organic NLO crystal: 4 – ethoxy benzaldehyde – n – methyl 4 – stilbazolium tosylate

Crystal Growth & Design

Growth and Characterization of the NLO Crystal 4-Dimethylamino-N-methyl-4-stilbazolium Tosylate (DAST)

Journal of Applied Crystallography

Enhancement of crystalline perfection by organic dopants in ZTS, ADP and KHP crystals as investigated by high-resolution XRD and SEM

A study of the effect of annealing on Fe-doped LiNbO3by HRXRD, XRT and FT–IR

Growth and characterization of organic non-linear optical crystal 4-hydoroxy benzaldehyde-N-methyl 4-stilbazolium tosylate (HBST)

Journal	Data powered by TypesetSpectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
Publisher	Data powered by TypesetElsevier BV
ISSN	1386-1425
Open Access	0