Lanthanopolyoxometalates as Building Blocks for Multiwavelength Photoluminescent Organic–Inorganic Hybrid Materials

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 (α 2 ‐P 2 M 17 O 61 )(picOH) 7 ] · y H 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 (α 2 ‐P 2 Mo 17 O 61 )(picOH) 7 ] · 10H 2 O.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)