Iron(III) citrate tribasic monohydrate, 99.0+%

Ferric citrate or iron(III) citrate is an ionic chemical compound with formula FeC6H5O7, consisting of a trivalent iron cation (Fe3+) and a trivalent citrate anion (C6H5O3−7). It is a dark orangeish or reddish brown solid, slightly soluble in hot water yielding an orange or orange-yellow solution at pH < 2.0. The solution becomes green at pH > 2.0

Sometimes the term is also used for the salt tetraferric tricitrate Fe4(C6H4O7)3, where the citrate anions are fully deprotonated (C6H4O4−7).

Ferric citrates play important roles in the metabolism of iron by living organisms. Citrate anions are released by plant roots and some microorganisms in order to extract iron from insoluble compounds in the soil, such as ferric hydroxide, and form soluble ferric citrates that can be absorbed by the organism.