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Ragupathy D.,PRIST University | Lee S.C.,Kyungpook National University | Al-Deyab S.S.,King Saud University | Rajendran A.,Sir Theagaraya College
Journal of Industrial and Engineering Chemistry | Year: 2013

We report a facile and surfactant assisted synthesis of polyaniline microrods (PANI-MR) by "single-step chemical oxidative polymerization" method. The morphology of the PANI-MR was investigated by field-emission scanning electron microscopy (FE-SEM). The average diameter of single PANI-MR was calculated to be ∼1.3 μm. The physiochemical characterization was examined using UV-visible spectroscopy, Fourier transform infrared spectroscopy and cyclic voltammetry. The electrical conducting property of the PANI-MR was analyzed using four-probe measurement method. © 2012 The Korean Society of Industrial and Engineering Chemistry.


Rajendran A.,Sir Theagaraya College | Raghupathy D.,Kyungpook National University | Priyadarshini M.,Sir Theagaraya College
International Journal of ChemTech Research | Year: 2011

Indole is one of the privileged molecules of organic chemistry and most of its derivatives are established pharmaceuticals. Because of the interesting biological activities, development of selective protocols for the synthesis of bis(indolyl)methanes is of current interest. In the present work, various electrophilic substitution reactions of indoles with several aldehydes were carried out using an inexpensive and reusable ionic liquid [Et3NH][HSO4] as catalyst to afford bis(indolyl)methanes in excellent yields. The optimal reaction conditions were fixed and the products were characterized by FT-IR, 1H-NMR and 13C-NMR studies. The catalytic behavior of Ionic Liquid [Et3NH][HSO4] compared with that of conventional catalyst. The ionic liquid was recovered and reused for more than five times without the potential loss in its activity. There is also the possibility of avoiding the use of any reaction medium as solvent less reaction, which is the main theme of this article. The present scope and potential economic impact of the reaction are demonstrated by the synthesis of bis (indolyl) methanes. Remaining challenges and future perspectives of the new transformation are discussed.


Kumar G.V.,Bharathiar University | Rajendran A.,Sir Theagaraya College
Synthetic Communications | Year: 2016

An effective and simple protocol for the Diels–Alder reactions catalyzed and mediated by ionic liquid in conjunction with Lewis acid was studied. Diels–Alder adduct of the reaction of 1,4-benzoquinone with isoprene and 2,3-dimethyl-1,3-butadiene was obtained in good to excellent yields within the time span of 5.00–4.00 min under microwave irradiation. Due to the excellent activity of 2,3-dimethyl-1,3-butadiene as a diene, its efficiency was further analyzed by performing against four different dienophiles under various reaction conditions. The ionic liquid, 3-methyl-1-octyl-imidazolium tetrachloroaluminate mixed with Lewis acids, could be recycled and reused for consecutive cycles. The recovered ionic liquid in conjunction with Lewis acid displayed almost similar activity without any significant loss. This system is an essential upgrade and related to the reactions consuming common organic solvents at high temperatures and longer duration. Diels–Alder reactions under solventless conditions have also been investigated for the aforesaid reactions. 2016 Copyright © Taylor & Francis Group, LLC


Rajendran A.,Sir Theagaraya College | Karthikeyan C.,Sir Theagaraya College
Ionics | Year: 2011

Novel Lewis acidic ionic liquids containing thionyl cations and chlorozincate anions were obtained by one pot synthesis for the first time. This ionic liquid is used as catalyst for Friedel-Crafts alkylation of benzalazines and acetophenone azines for the synthesis of substituted diaryl alkanes. The products were characterized by elemental and spectral (FT-IR, 1H-NMR and 13C-NMR) analyses. © 2011 Springer-Verlag.


Jayanthi S.N.,Center for Material Science | Prabakaran A.R.,Pachaiyappas College | Subashini D.,Pachaiyappas College | Thamizharasan K.,Sir Theagaraya College
Materials Today: Proceedings | Year: 2015

L-histidinium perchlorate, a semi-organic crystal has been grown by slow evaporation solution growth technique at room temperature. The growth of L-histidinium perchlorate was confirmed by single crystal X-ray diffraction analyses. Results of indentation-induced hardness testing are presented. The Vicker's hardness of the material in the load range 10-100g was 29-59Kg/mm2. The values of elastic stiffness constant, fracture mechanics, brittleness index and yield strength have also been calculated. The dielectric measurements of the crystal in the frequency range 100Hz-1MHz were investigated. The activation energy of electrical processes was also calculated and reported. © 2015 Elsevier Ltd.


Rajendran A.,Sir Theagaraya College | Mansiya C.,Bharathiar University
Ecotoxicology and Environmental Safety | Year: 2015

The study of changes in ground water quality on the east coast of chennai due to the December 26, 2004 tsunami and other subsequent disturbances is a matter of great concern. The post-Tsunami has caused considerable plant, animal, material and ecological changes in the entire stretch of chennai coastal area. Being very close to sea and frequently subjected to coastal erosion, water quality has been a concern in this coastal strip, and especially after the recent tsunami this strip seems to be more vulnerable. In the present investigation, ten ground water samples were collected from various parts of south chennai coastal area. Physico-chemical parameters such as pH, temperature, Biochemical oxygen demand (BOD), Dissolved oxygen (DO), total solids; turbidity and fecal coliform were analyzed. The overall Water quality index (WQI) values for all the samples were found to be in the range of 68.81-74.38 which reveals a fact that the quality of all the samples is only medium to good and could be used for drinking and other domestic uses only after proper treatment. The long term adverse impacts of tsunami on ground water quality of coastal areas and the relationships that exist and among various parameters are carefully analyzed. Local residents and corporation authorities have been made aware of the quality of their drinking water and the methods to conserve the water bodies. © 2015 Elsevier Inc.


Vijayaraghavan K.,Bharath University | Nalini S.P.K.,Sir Theagaraya College | Prakash N.U.,Tamil University | Madhankumar D.,Marina Labs
Colloids and Surfaces B: Biointerfaces | Year: 2012

A novel biosynthesis route for silver nanoparticles (Ag-NPs) was attempted in this present investigation using aqueous extracts of Trachyspermum ammi and Papaver somniferum. The main constituents in T. ammi are thymol, p-cymene and γ-terpinene, while P. somniferum consists of morphine and codeine. The essential oil in T. ammi was found to be a good reducing agent than the alkaloids present in P. somniferum for the formation of biocompatible Ag-NPs. The effectiveness of both the extracts was investigated by using same dosage of extract in the synthesis of silver nanoparticle. The results showed that for the same dosage of extracts the T. ammi synthesized various size triangular shaped nanoparticles measuring from 87. nm, to a fewer nanoparticles having a size of 998. nm diagonally. P. somniferum resulted in almost spherical shaped particle ranging in size between 3.2 and 7.6 μm diagonally. Future research based on synthesis of size specific nanoparticle based on the optimization of reaction condition would be an interesting area. © 2012 Elsevier B.V.


Sumithra Devi M.,Anand Institute of Higher Technology | Arthi A.P.,Thangavelu Engineering College | Thamizharasan K.,Sir Theagaraya College
Superlattices and Microstructures | Year: 2014

Single crystal of semiorganic nonlinear optical material of pure and Mg2+ doped ZTS were grown by slow evaporation technique from its aqueous solution. The grown crystal was characterized by single crystal XRD to determine the cell parameters. The Mg2+ doped was characterized by SEM and EDX spectrum. The chemical composition of both the pure ZTS and doped Mg2+ crystals were determined by Fourier transform infrared (FTIR). The optical absorption spectrum recorded in the wavelength was ranged from 200 to 2500 nm and its energy gap (Eg) for both pure ZTS is 4.47 eV and doped Mg2+ is 4.42 eV. The mechanical strength of the grown crystal was found from Vicker's microhardness measurements. It showed that pure and doped ZTS crystals are soft in nature. The dielectric measurement was carried out to study the different polarization mechanism and conductivity of the crystal. Photoconductivity studies revealed that the positive photoconductivity of the both were considered as grown crystals. © 2014 Elsevier Ltd. All rights reserved.


Brundha B.A.,Sir Theagaraya College | Pazhanisamy P.,Sir Theagaraya College
International Journal of ChemTech Research | Year: 2010

A series of ionic poly(N-tert-amylacrylamide -co -acrylamide/maleic acid) Hydrogels were synthesized by free-radical copolymerization in Water/Methanol medium using Ammonium persulfate (APS) as the initiator and N,N-methylenebisacrylamide (MBA) as a crosslinker at 60°C. The amount of N-tert-amylacrylamide (NTA) and Acrylamide (AM) monomers was fixed and the amount of Maleic acid (MA)was varied. The Hydrogels were characterized by IR spectroscopy. The swelling behavior of Hydrogels studied by Gravimetric method and degree of swelling was increased by increasing the amount of Maleic acid. The surface morphology was studied by SEM analysis.


Vijayaraghavan K.,Bharath University | Nalini S.P.K.,Sir Theagaraya College | Prakash N.U.,Tamil University | Madhankumar D.,Marina Labs
Materials Letters | Year: 2012

The present investigation deals with the synthesis of silver nanoparticles (AgNPs) by green synthesis that has advantages over conventional methods involving chemical agents associated with environmental toxicity. Green synthesis method involves the use of Syzygium aromaticum extract in the universal solvent namely water. The reaction process was simple and convenient to handle, and was monitored using ultraviolet-visible spectroscopy (UV-vis). The results were promising and rapid in the production of silver nanoparticle with a surface plasmon resonance occurring at 430 nm. The formed nanoparticles ranged in dimension between 20 and 149 nm which was almost spherical in shape. EDAX confirmed that the formed nanoparticles are silver as the optical absorption peak was observed approximately at 3 keV, which is typical for the absorption of metallic silver nanocrystallites. © 2012 Elsevier B.V. All rights reserved.

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