Photoluminescent hybrid materials based on lanthanopolyoxotungstates and 3-hydroxypicolinic acid

A series of organic–inorganic hybrid materials composed by lanthanopolyoxotungstates [Ln(W5O18)2]n− (Ln(III) = Eu, Tb, Er and Yb) and 3-hydroxypicolinic acid were prepared using different lanthanide ions. The compounds were characterized by FT-IR and FT-Raman spectroscopy and elemental analysis. The energy transfer processes from the organic ligand to the lanthanide (antenna effect) in these compounds have been studied by photoluminescence measurements.