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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. Source


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. Source


Prabhu S.,RMK Engineering College | Shobana S.,Rajas Institute of Technology for Women
Asian Journal of Chemistry | Year: 2014

The present study is carried out to find the extraction, physico-chemical analysis and toxicology with in vitro microbial screening characters of the Indian rubber seed oil. Vibrational studies of the oil exemplify the characteristic strong absorption at 1741 and 1461 cm-1 for -C=O and -C=C- groups respectively and did not give any idea about the presence of cyanide peak. Both the 1H NMR and 13C NMR spectral studies specify that the presence of triacylglycerol groups were saturated in addition to unsaturated. Determination of cyanide by means of colorimetric method was verified and there is no any absorption observed. This can be attributed that no hazardous linamarin were found in Indian rubber seed oil. Further, to estimate the potential of alternative hosts for oil production and influence of this oil with some common pathogenic microorganisms were also screened by well-diffusion techniques. Source


Mary S.S.,Gulf | Shobana S.,Gulf | Shobana S.,Rajas Institute of Technology for Women
Asian Journal of Chemistry | Year: 2014

In this work we explored the synthesis of twelve transition metal mixed ligand complexes (1-12). A new series of 5-fluorouracil (5-FU) with some amines namely ethylenediamine(en)/1,3-diaminopropane(1,3-dp)/ortho-phenylenediamine (opd) of general formulae [MAB (OAc) (H2O)], where M = Co(II), Cu(II), Ni(II) & Zn(II), A = 5-FU and B = en/1,3-dp/opd are presented. Micro elemental analysis, IR and UV were used to characterize these complexes. The antioxidative activity was also tested. © 2014, Chemical Publishing Co. All rights reserved. Source


Vadivel M.,Polymer Nanocomposite Center | Kumar M.S.C.,Polymer Nanocomposite Center | Selvam V.,Polymer Nanocomposite Center | Shobana S.,Rajas Institute of Technology for Women
Asian Journal of Chemistry | Year: 2014

The bismaleimide (N,N′-bismaleimide-4,4′-diphenylmethane) (BMI) modified siliconized zinc oxide nanoparticles were prepared in chloroform. The FT-IR spectroscopy analysis of BMI/ZnO reveals that -NH2 groups of siliconized ZnO reacts with the maleimide double bond of bismaleimide molecules through a nucleophilic (Michael) addition reaction. The thermal (TG) and morphological properties of bismaleimide modified zinc oxide nanoparticles (BMI/ZnO), were investigated. The particle size and morphology of zinc oxide nanoparticles and siliconized zinc oxide nanoparticles were determined by XRD. The SEM images indicate that the diameter of the zinc oxide nanoparticles is in the range of 25-40 nm with a strong aggregation process. It is observed that aggregates of bismaleimide modified siliconized zinc oxide nanocomposites of different size and shape are heterogeneously distributed in the elastomeric surface due to the low shear stress and processing time, which do not make an exfoliated material. © 2014, Chemical Publishing Co. All rights reserved. Source

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