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 Novel lanthanide luminescent materials based on complexes of 3-hydroxypicolinic acid and silica nanoparticles
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/5997

title: Novel lanthanide luminescent materials based on complexes of 3-hydroxypicolinic acid and silica nanoparticles
authors: Soares-Santos, PCR
Nogueira, HIS
Felix, V
Drew, MGB
Ferreira, RAS
Carlos, LD
Trindade, T
issue date: Jan-2003
publisher: American Chemical Society
abstract: New lanthanide complexes of 3-hydroxypicolinic acid (HpicOH) were prepared: [Ln(H2O)- (picOH)2(í-HpicO)]â3H2O (Ln ) Eu, Tb, Er). The complexes were characterized using photoluminescence, infrared, Raman, and 1H NMR spectroscopy, and elemental analysis. The crystal structure of [Eu(H2O)(picOH)2(í-HpicO)]â3H2O 1 was determined by X-ray diffraction. Compound 1 crystallizes in a monoclinic system with space group P21/c and cell parameters a ) 9.105(13) Å, b ) 18.796(25) Å, and c ) 13.531(17) Å, and â ) 104.86(1) deg. The 3-hydroxypicolinate ligands coordinate through both N,O- or O,O- chelation to the lanthanide ions, as shown by X-ray and spectroscopic results. Photoluminescence measurements were performed for the Eu(III) and Tb(III) complexes; the Eu(III) complex was investigated in more detail. The Eu(III) compound is highly luminescent and acts as a photoactive center in nanocomposite materials whose host matrixes are silica nanoparticles.
URI: http://hdl.handle.net/10773/5997
ISSN: 0897-4756
source: Chemistry of Materials
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