Volume-3 , Issue-3 , Jul 2015, ISSN 2348-3423 (Online) Go Back

• Open Access   Article

  Determination of bond length from EXAFS spectra of some copper(II) mixed ligand complexes

  Jaishree Bhale, Pradeep Sharma, A. Mishra, Neetu Parsai

  Research Paper | Isroset-Journal (IJSRPAS)

  Vol.3 , Issue.3 , pp.1-3, May-2015

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  Abstract
  X-ray absorption spectra at the K-edge of copper have been studied in two copper mixed ligand complexes having P-methoxybenzaldehyde as one of the ligands. Copper(II) complexes of two previously prepared ligands L1=(P-methyl anilino)- P-methoxy phenyl acetonitrile and L2 =(P-methoxy anilino)-P- methoxy phenyl acetonitrile were synthesized. The two ligands were prepared which included the reaction of P-methoxybenzaldehyde with P-toluidine and P-anisidine respectively. The complexes are : [Cu(L1)2](NO3)2 and [Cu2(L2)2(H2O)8](NO3)2 in which P-methoxybenzaldehyde has been used as primary ligand and P-toluidine and P-anisidine have been used as secondary ligands. The X-ray absorption spectra have been recorded at BL-8 Dispersive Extended X-ray Absorption Fine Structure (EXAFS) beamline at the 2.5-GeV INDUS-2 Synchrotron Source, RRCAT, Indore, India. The normalized EXAFS spectra have been Fourier transformed. EXAFS maxima and minima positions have been obtained. The bond length have been determined using four different methods, i.e., Levy’s, Lytle , Lytle, Sayers and Stern’s (LSS) and Fourier transformation methods. Both LSS and Fourier transformation methods give phase uncorrected bond lengths and hence results obtained from them have been compared with each other. The data obtained has been processed using EXAFS data analysis program Athena.

  Key-Words / Index Term
  Copper complexes, EXAFS, Athena, RRCAT, LSS

  References
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  Citation
  Jaishree Bhale, Pradeep Sharma, A. Mishra, Neetu Parsai, "Determination of bond length from EXAFS spectra of some copper(II) mixed ligand complexes," International Journal of Scientific Research in Physics and Applied Sciences, Vol.3, Issue.3, pp.1-3, 2015

• Open Access   Article

  Mechanoluminescence of Rare-Earth Doped Aluminate Phosphors-A Review

  Mohd Saleem, Riya Neema, M. Mittal, P.K.Sharma

  Review Paper | Isroset-Journal (IJSRPAS)

  Vol.3 , Issue.3 , pp.4-10, May-2015

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  Abstract
  Luminescence based on the rare-earth doped aluminates has been reported in this paper. The luminescence increases on the application of mechanical energy to these materials and this phenomenon is called the Mechanoluminescence. Since a few materials show persistent luminescence, the number of persistent luminescent materials is still less and the work done on the mechanism behind the phenomenon is still not conveniencing. The study reveals that they are persistent phosphors and the persistence remains for minutes to few days. It has been pointed out that these materials possess phosphorescence without doping. However, doping enhance their efficiency and hence persistence in their emission. The emission is so intense that it can be seen in day light with naked eye. It has been reported that their sensitivity to stress or any other mechanical energy attract the researchers as potential materials for sensitive sensors. Also the preparations and applications of these phosphors are discussed.

  Key-Words / Index Term
  Persistent Luminescence; Mechanoluminescence; aluminates and rare-earth doped Strontium Aluminates

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  Citation
  Mohd Saleem, Riya Neema, M. Mittal, P.K.Sharma, "Mechanoluminescence of Rare-Earth Doped Aluminate Phosphors-A Review," International Journal of Scientific Research in Physics and Applied Sciences, Vol.3, Issue.3, pp.4-10, 2015