Lanthanide complexes of the monovacant Dawson polyoxotungstate [ α2-As 2W 17O 61] 10- with 1D chain: Synthesis, structures, and photoluminescence properties

Abstract

Six new lanthanide complexes, (H 3O)[ Ln 3(H 2O) 17( α 2–As 2W 17O 61)]· nH 2O (( 1) Ln=Ce III and n≈13; ( 2) Ln=Pr III and n≈9; ( 3) Ln=Nd III and n≈14; ( 4) Ln=Sm III and n≈8; ( 5) Ln=Eu III and n≈4; ( 6) Ln=Gd III and n≈7), have been isolated by conventional solution method and characterized by elemental analysis, IR spectroscopy and single crystal X-ray diffraction. All the complexes are isomorphic and crystallize in the triclinic space group P-1. These complexes are 1D chain-like structures constructed by lanthanide cations and monovacant Dawson-type [ α 2-As 2W 17O 61] 10− polyoxoanions. The striking feature of the structures is that there are three kinds of coordination environments for lanthanide cations, which are responsible for the formation of polymeric structures. Photoluminescence measurements reveal that 4 and 5 exhibit orange and red fluorescent emission at room temperature, respectively.