A Planar {Mn19(OH)12}26+ Unit Incorporated in a 60‐Tungsto‐6‐Silicate Polyanion

Manganese in large numbers: The largest number of manganese ions ever incorporated in a polyoxometalate (POM) is found in a planar Mn19-oxo-hydroxo magnetic cluster incorporated in a discrete 60-tungsto-6-silicate (see structure Mn yellow, O red/pink). The compound has interesting structural, magnetic, and electrochemical properties.