Devanga Arts College Autonomous

Virudhunagar District, India

Devanga Arts College Autonomous

Virudhunagar District, India
SEARCH FILTERS
Time filter
Source Type

Muruganandam G.,AVVM Sri Pushpam College Autonomous | Mala N.,Devanga Arts College Autonomous | Pandiarajan S.,Devanga Arts College Autonomous | Srinivasan N.,Thiagarajar College of Engineering | And 3 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2017

This study focuses the effect of Mg doping level (0–12 at.% in steps of 3 at.%) on the photocatalytic efficacy of ZnO:F:Mg nanopowder synthesised using a simple cost-effective chemical method. The structural, surface morphological, photoluminescence studies were carried out for all the samples. The photocatalytic dye degradation study under visible light against the two different dyes viz methylene blue (MB) and malachite green (MG) revealed that ZnO:F:Mg nanopowder doped with 12 at.% of Mg shows superior photocatalytic activity compared to other doped and undoped samples for both the dyes examined. The degradation efficiency of undoped ZnO is found to be 65 and 74% for MB and MG, respectively, whereas the F + Mg co-doped ZnO nanopowder (10 + 12 at.%) exhibits enhanced photocatalytic activity against both the dyes and the degradation efficiency values for MB and MG are 88 and 97%, respectively. The reasons for this enhancement are addressed appropriately with the evidences obtain from photoluminescence and X-ray diffraction studies. © 2017 Springer Science+Business Media, LLC


Mala N.,Devanga Arts College Autonomous | Ravichandran K.,P.A. College | Pandiarajan S.,Devanga Arts College Autonomous | Srinivasan N.,P.A. College | And 3 more authors.
Materials Technology | Year: 2017

In this study, the photocatalytic activity of pristine and (Mg+Co) doped tin oxide (SnO2) nanopowders have been investigated towards the degradation of aqueous solutions of Methylene  Blue (MB) and Malachite Green (MG). In addition, the antibacterial activities of the synthesised samples were evaluated against Gram-positive Staphylococus aureus bacteria and Gram-negative Pseudomonas aeruginosa bacteria by the well diffusion method. The SnO2: Mg: Co nanopowders exhibit superior photocatalytic activity when compared with pristine SnO2. The degradation process follows a pseudo-first-order kinetics. The rate constant of SnO2: Mg: Co nanopowder is 1·2 times greater than that of pristine SnO2 nanopowder for the degradation of MB dye while for MG dye degradation, it is 1·5 times. Moreover, antibacterial activity of SnO2: Mg: Co nanopowder showed better antibacterial properties compared to pristine SnO2. The above mentioned samples were synthesised using a simple and low-cost soft chemical process. © 2017 Informa UK Limited, trading as Taylor & Francis Group


Esakkidurai T.,Devanga Arts College Autonomous | Subbaraj P.,Devanga Arts College Autonomous | Shobana S.,Pioneer India
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2013

Mixed ligand Cu(ii) complexes of 2-aminobenzamide (2AB) and amino acids viz., glycine (gly), L-alanine (ala), L-valine (val) and L-phenylalanine (phe) have been synthesised and characterized by various physico-chemical and spectral techniques. The calculated g-tensor values for Cu(ii) complexes at 77 K and 300 K, show the distorted octahedral geometry which has been confirmed from the absorption studies. Consequently, the thermal studies illustrate that the loss of water and acetate molecules in the initial stage which are followed by the decomposition of organic residues. The powder X-ray diffraction and SEM analysis reflect that all the complexes have well-defined crystallinity nature with homogeneous morphology. The binding activities of CT DNA with CuAB complexes have been examined by absorption studies. Further, the oxidative cleavage Interactions of 2-aminobenzamide and CuAB complexes with DNA were studied by gel electrophoresis method in H2O2 medium. Also, the complex formation of Cu(ii) involving 2-aminobenzamide and amino acids were carried out by a combined pH-metric and spectro-photometric techniques in 50% (v/v) water-ethanol mixture at 300, 310, 320 and 330±0.1 K with i= 0.15 mol dm 3 (NaClO4). in solution, CuAB and CuAB2 species has been detected and the binding modes of 2-aminobenzamide and amino acids in both binary and mixed ligand complexes are same. The calculated stabilization value of δ log K, log X and log X′ indicates higher stabilities for the mixed ligand complexes rather than their binary species. The thermodynamic parameters like δG, DH and DS have been determined from temperature dependence of the stability constant. in vitro biological activities of 2-aminobenzamide, CuA and CuAB complexes show remarkable activities against some bacterial and fungal strains. The percentage distribution of various binary and mixed ligand species in solution at dissimilar pH intervals were also evaluated. © 2013 Elsevier B.V. All rights reserved.


Subbaraj P.,Devanga Arts College Autonomous | Esakkidurai T.,Devanga Arts College Autonomous | Shobana S.,Rajas Institute of Technology for Women | Raji S.,Islamiah College Autonomous
Acta Chimica Slovenica | Year: 2014

Mixed ligand complexation of 2-aminobenzamide (2AB) as ligand [L] with Zn(II) in the presence of some bio-relevant amino acid constituents like glycine (gly), L-alanine (ala), L-valine (val) and L-phenylalanine (phe) as ligand [B] have been investigated using pH-metric measurements with a combined pH electrode at different temperatures (300, 310, 320 and 330 ± 0.1 K) in 50% (v/v) ethanol-water mixture containing I = 0.15 M NaClO4 as supporting electrolyte. Computer assisted analysis of the experimental titration data showed the presence of ZnLB and ZnLB2 species as mixed ligand complexes in addition to various binary species. In ZnLB/ZnLB2 species, both primary and secondary ligands act as bidentate to form a stable six, five membered chelate ring. The calculated stabilization parameter Δlog K, log X, log X' and % R.S. values clearly show the mixed ligand complexes have higher stabilities than their binary. Thermodynamic parameters ΔG, ΔH and ΔS have been derived from the temperature dependence of the stability constants. The complexation behavior of ZnLB species has been studied by means of electronic spectra. The percentage distribution of various binary and mixed ligand species of each type of the complexes in solution depending on pH and the ratio of Zn(II) to 2-aminobenzamide/amino acid of the systems.


Raji S.,Islamiah College | Kamil S.R.M.,Islamiah College | Subbaraj P.,Devanga Arts College Autonomous
Asian Journal of Chemistry | Year: 2015

A series of novel potent hetero aromatic nitrogen ring of imidazo[2,1-d][1,2,3,5]tetrazine-4(3H)-one derivatives (1a-1i) have been synthesized from 5-propylthio-2-diazo-2H-benzimidazole with substituted isocyanates. The synthesized compounds were structurally characterized by using various analytical and spectral techniques. In vitro microbial activities of the ligands were screened against some pathogenic bacterial and fungal species by modified well diffusion method using agar medium. All the synthesized compounds show significant biological activity as compared to the standard control drugs. Furthermore, antiproliferative activities of these compounds have been investigated against some breast (MCF-7), prostate (PC-3), lung (H1975) and colon (HCT-116) cancer cell lines. The compound (1b) showed a noticeable antiproliferative activity against the entire cell lines than the others.


Subbaraj P.,Devanga Arts College Autonomous | Ramu A.,Madurai Kamaraj University | Raman N.,Vhnsn College Autonomous
Journal of Saudi Chemical Society | Year: 2015

A new bidentate NO type Schiff base ligand (HL), derived from 2-hydroxy-4-methoxyphenyl)phenylmethanone with aniline and its metal(II) [M = Mn, Co, Ni, Cu and Zn] complexes has been synthesized. The synthesized ligand and the metal(II) complexes were structurally characterized by analytical, spectral (FT-IR, UV-vis., 1H NMR, FAB-Mass, TGA/DTA and EPR) as well as molar conductance and magnetic studies. All the complexes are non-electrolytes having 1:2 stoichiometry. They adopt tetrahedral and octahedral geometry. Thermal behavior of metal(II) complexes (1a-1c) shows loss of coordinated water molecules in the first step followed by the decomposition of ligand moieties in a respective manner and leads to form an air stable metal oxide as the final residue. Micro crystalline nature and the presence of coordinated water molecules have been confirmed by powder XRD, SEM and thermal analyses. The ligand and its complexes have efficient bio-efficacy, DNA binding and cleavage ability. © 2014 King Saud University.


Subbaraj P.,Devanga Arts College Autonomous | Esakkidurai T.,Devanga Arts College Autonomous | Shobana S.,Rajas Institute of Technology for Women
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2014

A series of novel bioactive mixed ligand Ni(II) complexes (1a-1d) have been synthesised by using 2-aminobenzamide (2AB) and some bio-relevant amino acid ligands. The synthesised Ni(II) complexes were structurally characterized by various physico-chemical and spectral studies. Elemental analysis and molar conductance values suggest that 1:1:1 stoichiometry with non-electrolytic nature. Based on the spectral studies, both the ligands act as bidentate and they chelate with Ni(II) ion via amino-NH2 and amido-O and deprotonated carboxylato-O and amino-NH2 atoms respectively to form a stable six, five membered chelate rings with mononuclear octahedral geometry. Thermal studies show the presence of coordinated water and acetate molecules in the coordination. The powder X-ray diffractogram and SEM pictograph imply that all the complexes have fine crystalline peaks with homogeneous surface morphology. In vitro antimicrobial and antioxidant studies indicate the complexes are more active than free 2-aminobenzamide ligand. The Ni(II)-2AB-gly/phe complexes (1a and 1d) show significant oxidative cleavage and DNA binding activities. Moreover, the 3D molecular modeling, analysis of the complexes has also been studied. © 2014 Elsevier B.V. All rights reserved.


Subbaraj P.,Devanga Arts College Autonomous | Esakkidurai T.,Devanga Arts College Autonomous
Journal of Coordination Chemistry | Year: 2015

A series of Ni(II), Cu(II), and Zn(II) complexes of 2-aminobenzamide(2AB: L) and some imidazole enzyme constituents(B) viz., imidazole(him), benzimidazole(bim), histamine(hist), and L-histidine(his) have been synthesized and characterized using analytical and various spectral studies. Vibrational spectral data of the synthesized complexes reveal that the ligands bind with metal(II) ions through nitrogen and oxygen. The calculated g-tensor values of Cu(II) complexes suggest that the unpaired electron is localized in the orbital. The results obtained from the spectral studies confirm the distorted octahedral environment around the metal(II) ions. Their powder XRD indicates microcrystalline nature and SEM pictographs identify their uniform surface morphology. Cu(II) and Ni(II) complexes show biological, antioxidant, and DNA activities when compared to free 2-aminobenzamide. Equilibrium studies have been carried out pH-metrically in 50% (v/v) water-ethanol mixture at 37 °C and I = 0.15 mol dm-3 NaClO4. Analysis reveals the presence of certain heteroligand species viz., MLBH/MLB/MLB2, in addition to various primary species. In MLB/MLB2 species, 2AB(L) binds with M(II) ions via N-amino and O-amido, whereas the ligands(B) him and bim are monodentate, hist and his are bi and tridentate, respectively. The stabilization parameters Δ log K, log X, log X', and % RS clearly indicate all the heteroligand complexes have higher stabilities than their primary. © 2015 2015 Taylor & Francis.


Mala N.,Devanga Arts College Autonomous | Ravichandran K.,AVVM Sri Pushpam College Autonomous | Pandiarajan S.,Devanga Arts College Autonomous | Srinivasan N.,Thiagarajar College of Engineering | And 4 more authors.
Ceramics International | Year: 2016

The focus of this work is to realize ZnO microparticles with simultaneously enhanced antibacterial and magnetic properties through a double cationic (Mg+Co) doping. Undoped and magnesium (Mg)+ cobalt (Co) doped ZnO microparticles were synthesized using a cost-effective simple soft chemical route. Their surface morphological, magnetic, antibacterial and structural properties were investigated. Antibacterial studies of the prepared samples were carried out against a Gram Positive and Gram Negative bacteria. From the antibacterial studies, it is found that the double cationic doped ZnO microparticles exhibit superior antibacterial efficiency compared with undoped and single cationic doped ZnO microparticles. The FESEM images show that the undoped and single cationic (Mg/Co) doped ZnO particles have hexagonal block structures of micro scale dimensions whereas the double cationic doping causes the formation of hexagonal plate structures having near nanoscale thickness (∼150 nm), thereby increasing the effective reactive surface area. The magnetization curves show that the coexistence of Mg2+ and Co2+ ions in the ZnO lattice causes a pronounced increase in the ferromagnetic behavior, already present in the undoped and single cationic doped ZnO material. The XRD, FTIR and PL results support the discussion on the antibacterial and magnetic results. The EDAX profiles and the compositional mapping images confirm the presence of expected proportions of the constituent elements and their uniform distribution in the final product. Structural studies show that the products exhibit hexagonal wurtzite structure of ZnO without any secondary phases. © 2016 Elsevier Ltd and Techna Group S.r.l.


Saravanakkumar D.,Bharathiar University | Sivaranjani S.,Bharathiar University | Sivaranjani S.,Alagappa Chettiar College of Engineering And Technology | Umamaheswari M.,Devanga Arts College Autonomous | And 2 more authors.
Der Pharma Chemica | Year: 2016

This research work describes a novel green approach for the synthesis of ZnO nanoparticles at ambient/low temperature, where Ajwain (Carom - Trachyspermum ammi) seed extract functions as the zinc salt reducing agent. Different synthesis conditions provide control of particle size and size-distribution of particle formation. X-ray diffraction patterns confirm that ZnO nanoparticles synthesized with carom seed extract is a potential candidate for future experimentation and implementation in the biomedical field. The experimentally synthesized ZnO nanostructures were characterized using the field emission scanning electron microscopy (FE-SEM) and Powder Xray diffraction (PXRD) pattern measured with Cu Kα radiation. Moreover the photoluminescence (PL) measurements excited by the 380 nm line from the He-Cd laser were done at room temperature. The UV-Vis spectrum shows high absorption in the ultra-violet region at about 383.5 nm which makes the material to be suitable for UV filters. The average direct energy bandgap is determined as 3.490 eV. The scanning electron microscope study reveals that the morphology of the crystal is in the hexagonal shape. The average crystallite size is determined as 34.27 nm. The analysis of EDAX has shown the presence of zinc and oxygen. The FTIR study has shown the presence of Zn-O bond, C-O bond, C-H bond and metal oxygen bond.

Loading Devanga Arts College Autonomous collaborators
Loading Devanga Arts College Autonomous collaborators