Chromium(II) acetate

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What Wikipedia says

Chromium(II) acetate hydrate, also known as chromous acetate, is the coordination compound with the formula Cr2(CH3CO2)4(H2O)2. This formula is commonly abbreviated Cr2(OAc)4(H2O)2. This red-coloured compound features a quadruple bond. It exists as the dihydrate and the anhydrous forms. Both are diamagnetic.

Excerpt from the Wikipedia article “Chromium(II) acetate”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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