Mg College

Thiruvananthapuram, India

Mg College

Thiruvananthapuram, India
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Siji V.L.,Mg College | Kumar M.R.S.,Mg College | Suma S.,Sn College | Kurup M.R.P.,Cochin University of Science and Technology
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2010

Eight new transition metal complexes of benzaldehyde-N(4)-phenylsemicarbazone have been synthesized and characterized by elemental analyses, molar conductance, electronic and infrared spectral studies. In all the complexes, the semicarbazone is coordinated as neutral bidentate ligand. 1H NMR spectrum of [Zn(HL)2(OAc)2] shows that there is no enolisation of the ligand in the complex. The magnetic susceptibility measurements indicate that Cr(III), Mn(II), Fe(III), Co(II) and Cu(II) complexes are paramagnetic and Ni(II) is diamagnetic. The EPR spectrum of [Mn(HL)2(OAc)2] in DMF solution at 77 K shows hyperfine sextet with low intensity forbidden lines lying between each of the two main hyperfine lines. The g values calculated for the [Cu(HL)2SO4] complex in frozen DMF, indicate the presence of unpaired electron in the dx2 - y2 orbital. The metal ligand bonding parameters evaluated showed strong in-plane σ bonding and in-plane π bonding. The ligand and complexes were screened for their possible antimicrobial activities. © 2010 Elsevier B.V. All rights reserved.

Jisha K.R.,Sn College Kollam | Suma S.,Sn College Kollam | Sudarsanakumar M.R.,Mg College
Polyhedron | Year: 2010

Alkaline earth metal (Mg, Ca, Sr and Ba) complexes of hippuric acid (hipH) have been synthesized and characterized by elemental analyses and IR spectroscopy. One of the complexes, [Ca(hip) 2(H 2O) 2]·H 2O, was characterized by single crystal X-ray diffraction studies. The polymeric structure is based on a dimeric unit and each calcium is coordinated to four hippurate anions and two coordinated water molecules. The hippurate anion functions as a bidentate ligand through the oxygen atoms of the carboxylate groups, one of which is bridging, forming a two dimensional coordination polymer. The water coordination is further confirmed by thermal analysis. The non-linear optical activity of the complexes was also measured. © 2010 Elsevier Ltd. All rights reserved.

Seven Zn(II) and Cd(II) complexes of ON donor acetone-N(4)- phenylsemicarbazone (HL) have been synthesized and physico-chemically characterized by partial elemental analyses, molar conductance measurements, infrared, electronic and 1H NMR spectral studies. The semicarbazone binds the metal as a neutral bidentate ligand in all the complexes. The crystal structures of acetone-N(4)-phenylsemicarbazone and [Cd(HL)2Cl 2] have been determined by X-ray diffraction studies. The coordination geometry around cadmium(II) in the complex [Cd(HL) 2Cl2] is distorted octahedral. © 2010 Elsevier Ltd. All rights reserved.

Khandare H.W.,Mg College
International Journal of ChemTech Research | Year: 2013

Occurrence of fluorine in ground water has drawn worldwide attention due to its considerable impact on human physiology. Presence of low or high concentration of certain ions is a major issue as they make the groundwater unsuitable for various purposes. Fluoride (F-) concentration over and above the permissible limits (1.5 mg/l) in drinking water leads to human health hazards, such as dental and skeletal fluorosis affecting millions of people in many parts of India. Several rocks have fluoride bearing minerals like apatite, fluorite, biotite and hornblende. The weathering of these rocks and infiltration of rainfall through it increases fluoride concentration in groundwater. Fluoride from water or wastewater can be removed by an ion exchange/adsorption process or by a coagulation, precipitation process. The ion exchange/adsorption can be applied to either concentrated or diluted solutions and they are capable of achieving complete removal under proper conditions. The method suitable for a given situation needs to be judiciously selected considering the various aspects. Since ingestion of high fluoride has a long term effect on human health it is essential to monitor its concentration in groundwater used for drinking periodically and take steps to bring them within the permissible range of 0.6 to 1.5 mg/l. There are several methods available for the removal of fluoride from groundwater. The paper presents the current information on fluoride in environment and its effects on human health and available methods of defluoridation in detail.

Khandare H.W.,Mg College
International Journal of ChemTech Research | Year: 2013

Groundwater quality is one of the most important aspects in water resource studies 1, 2. The major hydrochemical parameters for ascertaining the quality of water for potable purposes are - Total dissolved solids, Nitrate & Fluoride. Nitrogen is a major constituent of the earth's atmosphere and occurs in many different gaseous forms such as elemental nitrogen, nitrate and ammonia. Natural reactions of atmospheric forms of nitrogen with rainwater result in the formation of nitrate and ammonium ions. Nitrate is one of the most common groundwater contaminants in rural areas and is reported from several areas in Tamil Nadu, Orissa, Karnataka, Maharashtra, Bihar, Gujarat, Madhya Pradesh & Rajasthan. The sources of nitrate in the groundwater were attributed to bedrock dissolution in the course of groundwater migration. Other common sources of nitrate include human sewage and livestock manure. Nitrate is also a common constituent of chemical fertilizers. High nitrate level in drinking water leads to infant methaemoglobinaemia (blue-baby syndrome), gastric cancer goiter, metabolic disorder, birth malformations, hypertension and livestock poisoning. In fact the increased concentration of hydrotoxicants have created socio-economic problem and adversely affected the livelihood of inhabitants. Therefore, for sustainable health and development, immense and immediate efforts are required to combat the problem. In the present communication the extent of problem, distribution of Nitrate in groundwater, their health effects, and remedial measures will be discussed comprehensively.

Sankar K.,Mg College | Nazeera Beevi A.,Government College
Oriental Journal of Chemistry | Year: 2011

The Present paper deals with the study of synthesis and characterisation of Cu(II), Co(II), Ni(II) and Mn(III) complexes of polystyrene with 2-aminobenzaldehyde phenyl hydrazone ligand. The study is supported by magnetic susceptibility, infrared and UV-visible spectral study and thermal studies. The ligand and its metal complexes were screened for their antimicrobial activity using S. aureus and E. coli micro organism and found to be moderately active. All the complexes catalyse the decomposition of H2O2, copper(II) complex being the most active.

Anoop M.R.,Sn College | Binil P.S.,Sn College | Suma S.,Sn College | Sudarsanakumar M.R.,Mg College
Journal of Rare Earths | Year: 2012

The complexes of rare earth elements with 1,2-diphenyl-4-butyl-3,5- Pyrazolidinedione (PBH, phenylbutazone) were synthesized and characterized by elemental analysis, molar conductance, IR, UV-Vis, EPR and magnetic moment measurements. Based on these studies the complexes were formulated as [Ln(PB) 3(H 2O) 2]·nH 2O, where Ln=Eu(III), Gd(III), Tb(III), Dy(III) and Er(III). From IR spectra, it was found that PBH acted as a bidentate mono-ionic ligand coordinating through two carbonyl oxygen of the pyrazolidinedione ring. The thermal analysis of all the complexes was carried out at a heating rate of 10 °C/min. The kinetic aspects of the complexes were evaluated. The negative entropy value of the complexes indicated a more ordered state for the activated complexes. The photoluminescence property of Tb(III) complex was investigated. It showed all the characteristic emission peaks of Tb 3+ with a life time of 0.98914 ms. © 2012 The Chinese Society of Rare Earths.

Khandare H.W.,Mg College
International Journal of ChemTech Research | Year: 2012

Abstract: Medical Geology is an emerging scientific discipline that examines the impacts of geologic materials and processes on human health and ecosystem. It is the science dealing with relationship between natural geological factors and health in man and animals and understanding the influence of ordinary environmental factors on the geographical distribution of such health problems. Every day human beings interact directly with nature by way of eating, drinking and breathing, and in the process ingests minerals and trace elements. The material consumed is mostly harmless and even beneficial, supplying essential nutrients to the body. However, the interaction with minerals and trace elements can sometimes have devastating, even fatal effects. All these interactions are covered under the realm of medical geology. It is therefore a fast-growing field that not only involves geoscientists but also medical, public health, veterinary, agricultural, environmental and biological scientists. In the broader perspective, medical geology includes the study of the effects of geologic materials and processes on human, animal and plant health, with both good and bad, even hazardous results. Precisely, medical geology studies exposure to or deficiency of trace elements and minerals; inhalation of ambient and anthropogenic mineral dusts and volcanic emissions; transportation, modification and concentration of organic compounds; and exposure to radio-nuclides, microbes and pathogens. Medical Geology thus relates to the natural sciences such as botany, zoology, ecology, environment and allied sciences. It is therefore high time that the researches in these branches should come forward for the inter-disciplinary research on this subject of prime importance.

Santhosh V.S.,Mg College | Rajendra Babu K.,Mg College | Deepa M.,The Saints
Journal of Materials Science: Materials in Electronics | Year: 2014

Nanostructured Fe doped ZnO thin films were deposited onto glass substrates by sol-gel spin coating method. Influence of Fe doping concentration and annealing temperature on the structural, compositional, morphological and optical properties were investigated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), UV-Vis spectroscopy and photoluminescence (PL) measurements. XRD analysis showed that all the films prepared in this work possessed a hexagonal wurtzite structure and were preferentially oriented along the c-axis. Pure ZnO thin films possessed extensive strain, whereas Fe doped films possessed compressive strain. In the doped films, least value of stress and strain was observed in the 0.5 at.% Fe doped thin film, annealed at 873 K. Average crystallite size was not significantly affected by Fe doping, but it increased from 15.57 to 17.79 nm with increase in annealing temperature from 673 to 873 K. Fe ions are present in +3 oxidation state as revealed by XPS analysis of the 0.5 at.% Fe doped film. Surface morphology is greatly affected by changes in Fe doping concentration and annealing temperature which is evident in the SEM images. The increase in optical band gap from 3.21 to 3.25 eV, with increase in dopant concentration was attributed to Moss-Burstein shift. But increase in annealing temperature from 673 to 873 K caused a decrease in band gap from 3.22 to 3.20 eV. PL spectra showed emissions due to excitonic combinations in the UV region and defect related emissions in the visible region in all the investigated films. © Springer Science+Business Media New York 2013.

Jisha K.R.,Sn College | Suma S.,Sn College | Sudarsanakumar M.R.,Mg College
Journal of Thermal Analysis and Calorimetry | Year: 2010

Zirconyl complexes of hippuric acid (C9H9NO 3, hipH) and monophenylbutazone (4-butyl-1-phenyl-3,5- pyrazolidinedione,MPB) were prepared using ZrOCl2 . 8H2O and ZrO(NO3)3 . xH2O and characterized by elemental analysis, molar conductance measurement and IR, UV-Vis and NMR spectral methods. Thermal decomposition behaviour was studied by thermogravimetry. The second harmonic generation (SHG) conversion efficiency of hippuric acid complexes was also studied. © Akadémiai Kiadó, Budapest, Hungary 2009.

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