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Volume 68, Issue 2 (Feb 2014)

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Synthesis and photophysical properties of new Ln(III) (Ln = Eu(III), Gd(III), or Tb(III)) complexes of 1-amidino-O-methylurea

L. Singh
  • Department of Chemistry, Manipur University, Imphal, Manipur, 795 003, India
  • Email:
/ R. Singh
  • Department of Chemistry, Manipur University, Imphal, Manipur, 795 003, India
  • Email:
Published Online: 2013-10-30 | DOI: https://doi.org/10.2478/s11696-013-0446-1

Abstract

Three new solid lanthanide(III) complexes, [Ln(1-AMUH)3] · (NO3)3 (1-AMUH = 1-amidino-O-methylurea; Ln = Eu(III), Gd(III), or Tb(III)) were synthesised and characterised by elemental analysis, infrared spectra, magnetic moment measurement, and electron paramagnetic resonance (EPR) spectra for Gd(III) complex. The formation of lanthanide(III) complexes is confirmed by the spectroscopic studies. The photophysical properties of Gd(III), Eu(III), and Tb(III) complexes in solid state were investigated. The Tb(III) complex exhibits the strongest green emission at 543 nm and the Eu(III) complex shows a red emission at 615 nm while the Gd(III) complex shows a weak emission band at 303 nm. Under excitation with UV light, these complexes exhibited an emission characteristic of central metal ions. The powder EPR spectrum of the Gd(III) complex at 300 K exhibits a single broad band with g = 2.025. The bi-exponential nature of the decay lifetime curve is observed in the Eu(III) and Tb(III) complexes. The results reveal them to have potential as luminescent materials.

Keywords: lanthanide complexes; luminescence; decay lifetime; 1-amidino-O-methylurea

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About the article

Published Online: 2013-10-30

Published in Print: 2014-02-01


Citation Information: Chemical Papers, ISSN (Online) 1336-9075, DOI: https://doi.org/10.2478/s11696-013-0446-1. Export Citation

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