Dy-incorporated organic-inorganic hybrid polyoxometalates with photoluminescence property

Abstract

Two new organic-inorganic hybrid polyoxometalate [N(CH3)4]3K2[Dy(C7H5O2)(H2O)2(α-PW11O39)]·13H2O (1) and [N(CH3)4]3K2[Dy(C7H5O3)(H2O)2(α-PW11O39)]·13H2O (2) were prepared via the reaction of K14[P2W19O69(H2O)]·24H2O, DyCl3·6H2O and organic ligands, which were further characterized by IR spectrum, TG analysis, and X-ray single-crystal diffraction. Structural analysis reveals that 1 and 2 consist of polyanion [Dy(L)(H2O)2(α-PW11O39)]5– (L = C7H5O2 (1a), C7H6O3 (2a)), three [N(CH3)4]+ cations, two K+ cations for the charge balance, and thirteen water molecules. The excitation and emission spectra and decay time curves prove the existence of different potential energy transfer pathways, and the decay time curves indicate POM components can sensitize the emission of Dy3+ ion and lifetimes were prolonged.