Abstract
Currently,organic-inorganic hybrid lanthanide-incorporated polyoxometalates(POMs)have emerged as a prominent research area.Herein,we employ a simple raw material assembly method to synthesize two neoteric mixed-organic-ligand-ornamented lanthanide(Ln)incorporated selenotungstates[H2N(CH3)2]16Na2[Ln4(H2O)6-(HPZDA)2(HFMA)2W8O21][B-α-SeW9O33]4·29H2O(Ln=Sm3+(1),La3+(2);H2PZDA=2,3-pyrazine dicarboxylic acid,H2FMA=fumaric acid).1 and 2 are isomorphic with the polyanions constructed from four trivacant Keggin[B-α-SeW9O33]8-({SeW9})segments and a rigid-flexible-ligand-ornamented dodeca-nuclear W-Ln heterometallic[Ln4(H2O)6(HPZDA)2(HFMA)2W8O21]14+cluster.Moreover,the solid-state fluorescence spectrum of 1 at room temperature mainly exhibits the characteristic emission peak of Sm3+cations.Additionally,energy transfer from{SeW9}to Sm3+ions in 1 has been demonstrated by time-resolved spectroscopy.This work presents a feasible dual-ligand synergistic strategy for constructing novel POM derivatives and POM-based fluorescent materials.
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