Abstract
Utilizing reactions of [α-GeW11O39]8− and Eu3+ under different pH conditions, two types of polymer chains, Cs3K[Eu4(H2O)18Ge2W22O78] · 16.5H2O (1) and Cs3K2[Eu(H2O)2GeW11O39] · 10H2O (2), have been isolated and characterized by elemental analysis, IR spectroscopy, thermal analysis, and single-crystal X-ray diffraction. The Eu/[α-GeW11O39]8− ratio is 1 : 1 in polyanion 2a and is an infrequent 2 : 1 in polyanion 1a. The Ln : POM ratio can be increased by controlling the reaction conditions. The solid photoluminescence spectra of 1 and 2 have been investigated at room temperature. The luminescence of 1 and 2 are distinctly different owing to their different Eu coordination geometries. UV spectra and electrochemical properties of 1 and 2 have been investigated. Compound 1 displays good electrocatalytic activity toward the reduction of nitrite.
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