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Kaushik A.,Banasthali University | Dalela B.,SKIT | Rathore R.,University of Kota | Vats V.S.,Government College | And 4 more authors.
Journal of Alloys and Compounds | Year: 2013

A systematic investigation on the synthesis, characterization, optical and magnetic properties of Co doped ZnO nanocrystals have been reported. Nanocrystals of Zn1-xCoxO (where x = 0.05 and 0.10) were synthesized using the Sol-gel technique. Structural, optical and magnetic properties of the samples were investigated by X-ray diffraction (XRD), UV-VIS-NIR spectroscopy, Raman spectroscopy and SQUID magnetometer. Energy dispersive X-ray, Scanning electron microscopic, XRD and Raman measurements showed that the Co ions were successfully doped at the Zn site in the wurtzite type ZnO lattice. An appreciable blue shift in the absorption spectrum was observed, which indicates that the Co doping in ZnO leads to systematic increase in the band-gap with dopant concentration. Magnetization studies showed that the Co doped ZnO nanocrystals display room temperature ferromagnetism and the ferromagnetic ordering strengthens with the Co concentration. © 2013 Elsevier B.V. All rights reserved. Source

Ahuja M.,Mohan Lal Sukhadia University
Asian Journal of Chemistry | Year: 2014

1-Acetyl-5-aryl-3-(substituted thienyl)-4,5-dihydropyrazoles and their manganese complexes have been synthesized and characterized on the basis of elemental analysis, magnetic susceptibility, molar conductance, molecular weight determination and spectroscopic data. The IR data indicated that the coordination of the ligands to the manganese (II) ion was through the azomethine nitrogen and carbonyl oxygen. The micro analytical, electronic spectral assignments and magnetic moment suggested an octahedral geometry around the metal ion with 1:2 metal ligand stoichiometry. The complexes exhibited in vitro microbiocidal activity in comparison to ligands. © 2014, Chemical Publishing Co. All rights reserved. Source

Agarwal S.,Mohan Lal Sukhadia University | Gautam N.,P.A. College | Agarwal K.,University of Rajasthan | Gautam D.C.,University of Rajasthan
Journal of the Korean Chemical Society | Year: 2014

In the course of work on new pharmacologically active antimicrobial agents, we have reported the synthesis of a new class of structurally novel derivatives, incorporating two bioactive structures, a benzothiazole and thiazolidin-4-one, to yield a class of compounds having interesting antimicrobial properties. The antimicrobial properties of the synthesized compounds were investigated against bacteria (Staphylococcus aureus and Escherchia coli) and fungi (Candida albicans and Aspergillus niger) using serial plate dilution method. The structure of the synthesized compounds have been established by elemental analysis and spectroscopic data. Source

Khanam R.,Vidya Bhawan Rural Institute | Khan S.,Vidya Bhawan Rural Institute | Dashora R.,Mohan Lal Sukhadia University
Rasayan Journal of Chemistry | Year: 2014

Spectrophotometric determination of iron (III) has been done using p-Bromophenylazo-bis-acetoxime at 370nm, keeping the pH in the range 3.5-4.5. The molar absorptivity and Sandell's sensitivity values are 1,030 dm3 mol-1 cm-1 and 54.22 ng cm -2, respectively. The Beer's law is obeyed in the range (1 to 6) x10-5 M. © 2014 RASĀYAN. All rights reserved. Source

Kaushik A.,Banasthali University | Dalela B.,Swami Keshwanand Institute of Technology | Kumar S.,Mohan Lal Sukhadia University | Alvi P.A.,Banasthali University | And 2 more authors.
Journal of Alloys and Compounds | Year: 2013

The paper deals with the influence of Co doping on the structural, optical and magnetic properties of TiO2. XRD and Raman measurements confirmed single phase anatase structure of the Co doped TiO2 without having any impurity phases. The results are explained in terms of the broadening of peaks and small shift of Raman scattering modes, which is caused by the generation of defects such as vacancies and interstitials and owe their presence due to the microscopic structural disorder of oxygen lattice. 10% Co doped TiO2 exhibits room temperature ferromagnetic behavior with a 0.937 emu/g saturation magnetization and 65 Oe coercivity. Optical spectra have red shift with increasing Co in TiO2, due to sp-d exchange interactions. These interactions may be responsible for the ferromagnetic properties of the samples and the carriers are spin-polarized to mediate the ferromagnetic ordering. © 2012 Elsevier B.V. All rights reserved. Source

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