Syntheses, Crystal Structure, Electrocatalytic, and Magnetic Properties of the Monolanthanide-Containing Germanotungstates [Ln(H<sub>2</sub>O)<i><sub>n</sub></i>GeW<sub>11</sub>O<sub>39</sub>]<sup>5–</sup> (Ln = Dy, Er, <i>n</i> = 4,3)
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