Polyoxometalate

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What Wikipedia says

Polyoxometalates (POMs) are a class of inorganic compounds containing only transition metal(s) (M) and oxide (O2−) with general moleclur formula [MmOo]k− with m ≥ 3, o ≥ 9, k > 0. This article focuses on the isopolyoxometalates, where only one metallic element is involved.

Excerpt from the Wikipedia article “Polyoxometalate”, under the CC BY-SA 4.0 license. Read the article on Wikipedia