Disodium tetracarbonylferrate

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What Wikipedia says

Disodium tetracarbonylferrate is the organoiron compound with the formula Na2[Fe(CO)4]. It is always used as a solvate, e.g., with tetrahydrofuran or dimethoxyethane, which bind to the sodium cation. An oxygen-sensitive colourless solid, it is a reagent in organometallic and organic chemical research.

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

Image: 00:20, 25 April 2007 (UTC), Public domain, via Wikimedia Commons.