Interactions between Eu{sup 3+} ions in inorganic-organic hybrid materials
- Chimie de la Matiere Condensee de Paris, UMR 7574 CNRS, Universite Pierre et Marie Curie ENSCP, 11 rue Pierre et Marie Curie, 75235 Paris (France)
- European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, Karlsruhe 76125 (Germany)
- Institut Lavoisier de Versailles, UMR 8180 CNRS, Universite de Versailles St-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035 Versailles Cedex (France)
The optical properties of two-dimensional lanthanide dicarboxylates EuBDC or Eu{sub 2}(H{sub 2}O){sub 2}(O{sub 2}C-C{sub 6}H{sub 4}-CO{sub 2}){sub 3} and EuCDC (denoted also MIL94) or Eu{sub 2}(H{sub 2}O){sub 4}(O{sub 2}C-C{sub 6}H{sub 10}-CO{sub 2}){sub 3}.2H{sub 2}O are reported. The structures are built up from dimers of corner-sharing polyhedra and 1,3-benzenedicarboxylate (BDC) for EuBDC and from dimers of edge-sharing polyhedra and 1,3-benzenedicarboxylate (CDC) for EuCDC. The high Eu{sup 3+} concentration and the weak luminescence quenching allow the study of Eu{sup 3+} interactions. Anti-Stokes spectra from {sup 5}D{sub 1} are observed with excitation in {sup 5}D{sub 0}. These results are very unusual for Eu{sup 3+} ions and reflect strong interactions between ions within a dimer. Excitation spectrum of the Eu{sup 3+} luminescence strongly differs in both compounds in the UV range. In case of EuBDC, an efficient sensitization of the luminescence due to the ligand is observed between 250 and 350 nm while only 4f-4f transitions are recorded on the Eu{sup 3+} excitation spectrum in EuCDC. The efficiency of the sensitization of the rare earth by the host is discussed by taking into account the geometrical arrangement and the electronic delocalization of the ligands. - Graphical abstract: Excitation spectra monitoring the {sup 5}D{sub 0}->{sup 7}F{sub 2} transition with a dimer structure.
- OSTI ID:
- 21372555
- Journal Information:
- Journal of Solid State Chemistry, Vol. 183, Issue 4; Other Information: DOI: 10.1016/j.jssc.2010.01.028; PII: S0022-4596(10)00042-3; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
DIMERS
EUROPIUM COMPLEXES
EUROPIUM IONS
LIGANDS
LUMINESCENCE
OPTICAL PROPERTIES
QUENCHING
SPECTRA
STRONG INTERACTIONS
BASIC INTERACTIONS
CHARGED PARTICLES
COMPLEXES
EMISSION
INTERACTIONS
IONS
PHOTON EMISSION
PHYSICAL PROPERTIES
RARE EARTH COMPLEXES