Magnetic properties and sensitized visible and NIR luminescence of Dy-III and Eu-III coordination polymers by energy transfer antenna ligands


ÇOBAN M. B., KOÇAK Ç., KARA SUBAŞAT H., AYGÜN M., Amjad A.

MOLECULAR CRYSTALS AND LIQUID CRYSTALS, vol.648, no.1, pp.202-215, 2017 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 648 Issue: 1
  • Publication Date: 2017
  • Doi Number: 10.1080/15421406.2017.1280911
  • Journal Name: MOLECULAR CRYSTALS AND LIQUID CRYSTALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.202-215
  • Keywords: Lanthanide, hydrothermal synthesis, photoluminescence, magnetism, NEAR-INFRARED LUMINESCENCE, LANTHANIDE COMPLEXES, CRYSTAL-STRUCTURES, HYDROTHERMAL SYNTHESIS, UP-CONVERSION, HO-III, PHOTOLUMINESCENCE, BEHAVIOR, SERIES, HOLMIUM(III)
  • Dokuz Eylül University Affiliated: Yes

Abstract

Two coordination polymers, {[Ln(2-stp)(4,4 '-bipy)(H2O)]center dot(H2O)}, [Ln = Dy (1) and Eu (2), 2-stp = 2-sulfoterephthalate and 4,4 '-bipy = 4,4 '-bipyridine] have been characterized by solid state UV-vis, FTIR spectra, X-ray single crystal diffraction and solid state photoluminescence. Variable-temperature magnetic susceptibility and isothermal magnetization as function of external magnetic field is also studied for both complexes. After ligand-mediated excitation, both complexes show the characteristic visible and NIR luminescence of the corresponding Ln(III) ions (Ln = Dy, Eu) which is due to efficient energy transfer from the ligands to the central Ln(III) ions via an antenna effect. The indirect energy transfer in both complexes has been investigated and discussed in detail.