abstract
Organic-inorganic hybrid materials were prepared by combining lanthanide(III) substituted Wells-Dawson anions as inorganic building blocks and 3-hydroxypicolinate (picOH) as the organic ligand. The organic-inorganic hybrids obtained K(n)[Ln(x)(alpha(2)-P(2)M(17)O(61))(picOH)(7)]center dot yH(2)O (M(VI) = W and Ln(III) = La, Ce, Sm, Eu, Tb, Er; or M(VI) = Mo and Ln(III) = Eu) were characterized by chemical analysis and spectroscopic methods such as FTIR and FT-Raman, (31)P and (13)C MAS NMR spectroscopy. Photoluminescence measurements on the prepared hybrid materials were performed showing the intra-4f(N) emission in the visible (Eu(III), Tb(III) compounds) and in the near-infrared (Er(III) compound) spectral regions, being, in all the cases, sensitized by both the picOH ligand and the polyoxometalate moiety. A maximum quantum yield value of 0.18 was found for K(11)[Eu(2)(alpha(2)-P(2)Mo(17)O(61))(picOH)(7)]center dot 10H(2)O. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
keywords
EUROPIUM-SUBSTITUTED HETEROPOLYTUNGSTATE; INTRAMOLECULAR ENERGY-TRANSFER; LANGMUIR-BLODGETT-FILMS; 3-HYDROXYPICOLINIC ACID; LANTHANIDE COMPLEXES; SOLID-STATE; RARE-EARTH; POLYNUCLEAR MOLYBDENUM; LUMINESCENT MATERIALS; TUNGSTEN COMPLEXES
subject category
Chemistry
authors
Granadeiro, CM; Ferreira, RAS; Soares-Santos, PCR; Carlos, LD; Nogueira, HIS
our authors
Carlos Miguel Cardeal Enes Granadeiro
Post-Doc Fellowship
Helena Isabel Seguro Nogueira
Assistant Professor with Aggregation
Luís Carlos
Full professor
Maria Rute de Amorim e Sá Ferreira André
Full professor
Paula Cristina Ramos Soares e Santos
Laboratory Officeracknowledgements
The authors would like to thank the Fundacao para a Ciencia e a Teenologia (Portugal) for funding under the POCI 2010 and PTDC programs and FEDER (POCI/QUI/58887/2004 and PTDC/QU1/67712/2006) and for post graduation grants to C.M.G. (SFRH/BD/30137/2006) and P.C.R.S.S. (SFRH/BPD/14954/2004).