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Sangeetha V.,DG Vaishnav College | Kanagathara N.,Vel Technology Multi Technology Dr Rangarajan Dr Sakunthala Engineering College | Chakkaravarthi G.,CPCL Polytechnic College | Marchewka M.K.,Institute of Low Temperature And Structure Research | Anbalagan G.,Presidency College at Chennai
Acta Crystallographica Section E: Structure Reports Online | Year: 2013

The asymmetric unit of the title compound, C3H 6N6·2C6H5NO3, contains one melamine and two 3-nitrophenol molecules. The mean planes of the 3-nitrophenol molecules are almost orthogonal to the plane of melamine, making dihedral angles of 82.77 (4) and 88.36 (5)°. In the crystal, molecules are linked via O - H⋯N, N - H⋯N and N - H⋯O hydrogen bonds, forming a three-dimensional network. The crystal also features weak C - H⋯π and π-π interactions [centroid-centroid distance = 3.9823 (9) Å]. © Sangeetha et al. 2013. Source


Balijapalli U.,Vellore Institute of Technology | Munusamy S.,Vellore Institute of Technology | Sundaramoorthy K.N.,Vel Technology Multi Technology Dr Rangarajan Dr Sakunthala Engineering College | Iyer S.K.,Vellore Institute of Technology
Synthetic Communications | Year: 2014

Acetic acid-promoted, one-pot synthesis of tetrahydropyridines has been developed under metal-catalyst-free conditions via a tandem reaction. High atom economy, good yield, simple procedure, no expensive column chromatography, shorter reaction time, and metal-free and mild reaction conditions are some of the important features of this protocol. The current methodology provides an alternative approach for not only highly substituted tetrahydropyridines (THPs) but also fully substituted tetrahydropyridines (FTHPs) in moderate to good yields. The plausible mechanism for the formation of THPs was greatly promoted by the H+ ion coming from acetic acid. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications® for the following free supplemental resource(s): Full experimental and spectral details.] © 2014 Copyright Taylor and Francis Group, LLC. Source


Saravana Kumar G.,HIGH-TECH | Parthasarathy V.,Vel Technology Multi Technology Dr Rangarajan Dr Sakunthala Engineering College | Sivasaravana Babu S.,HIGH-TECH | Sudhakar S.,HIGH-TECH
International Journal of Applied Engineering Research | Year: 2015

A Brain-Computer Interface (BCI) is a precise type of human-computer interface that facilitates unswerving communication between human and computers by scrutinizing Electroencephalogram (EEG). The efficiency of the BCI depends on the Information Transfer Rate (ITR) and ITR depends on precise feature extraction. The paper presents a scheme to compute energy spectral density of the EEG. The scheme was applied on arbitrary five pairs of channels of EEG. It precisely calculates energy spectral density (ESD) for each unique frequency value present in EEG. It also localizes highest ESD component for each channel. © Research India Publications. Source


Kanagathara N.,Vel Technology Multi Technology Dr Rangarajan Dr Sakunthala Engineering College | Anbalagan G.,Presidency College at Chennai
International Journal of Optics | Year: 2012

Optically good quality single crystals of pure and L-lysine monohydrochloride-doped KDP crystals have been grown by a slow evaporation method. The grown crystals have been subjected to optical and dielectric studies. The UV-Vis spectrum shows the transmitting ability of the crystals in the entire visible region and transmittance percentage is increased for the doped KDP crystals. From the dielectric study, it is found that the dielectric constant and the dielectric loss of L-lysine-doped KDP crystals were lower than the pure KDP crystals. Hence L-lysine-doped KDP crystals are found to be more beneficial from an application point of view as compared to pure KDP crystals. Copyright © 2012 N. Kanagathara and G. Anbalagan. Source


Jose M.,Vel Technology Multi Technology Dr Rangarajan Dr Sakunthala Engineering College | Uthrakumar R.,Loyola College | Jeya Rajendran A.,Loyola College | Jerome Das S.,Loyola College
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2012

Non centrosymmetric potassium p-nitrophenolate dihydrate single crystals have been grown by employing the technique of slow solvent evaporation from aqueous solution by slightly adjusting the pH and growth temperature. The grown crystals have been identified from single crystal XRD analysis, FTIR and FT Raman spectroscopic techniques. The high resolution X-ray diffraction experiments substantiate good quality of the title material. Between 510 and 2000 nm, the material is observed to be nearly transparent allowing it to be explored for potential use in device fabrication. In addition, the photoluminescence spectrum of the grown crystal at room temperature shows a stable broad violet-blue emission around the 383-550 nm wavelengths with the maximum centered at 436 nm. Owing to its excellent non linear figure of merit and strong PL emission, the title crystal can have technological applications in opto-electronic devices. © 2011 Elsevier B.V. All rights reserved. Source

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