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Synthesis of a 6‑nm-Long Transition-Metal–Rare-Earth-Containing Polyoxometalate

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posted on 2019-09-06, 17:34 authored by Qing Han, Zhong Li, Xiangming Liang, Yong Ding, Shou-Tian Zheng
An extremely long ribbon-shaped polyoxometalate (POM) octamer, {Eu16­Co7­Se16­W128­O448­(CIT)10­(HCIT)2­(NO3)4­(OH)4­(H2O)52} (H4CIT = citric acid), with a maximum length of ca. 6 nm has been obtained, which is the longest molecular POM reported to date and the first Dawson-based 3d–4f-containing selenotungstate­(IV). The nanoscale octamer is built from 8 new Dawson-type Eu2W2-substituted selenotungstates {(Eu2W2O4)­Se2W14O52} bridged by 12 H4CIT ligands and 3 Co2+ ions, giving rise to a rare giant inorganic–organic hybrid molecular POM with more than 150 metal centers (7 CoII, 16 EuIII, 16 SeIV, and 128 WVI). Especially, with 128 W centers and more than 800 non-H atoms, the POM octamer also represents the largest known 3d–4f-containing polyoxotungstate.

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