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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 usingphotoluminescence, 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-raydiffraction. Compound 1 crystallizes in a monoclinic system with space group P21/c and cellparameters 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 thelanthanide ions, as shown by X-ray and spectroscopic results. Photoluminescence measurementswere performed for the Eu(III) and Tb(III) complexes; the Eu(III) complex wasinvestigated in more detail. The Eu(III) compound is highly luminescent and acts as aphotoactive center in nanocomposite materials whose host matrixes are silica nanoparticles

Novel Lanthanide Luminescent Materials Based on Complexes of 3-Hydroxypicolinic Acid and Silica Nanoparticles