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Ferrous citrate, also known as iron(II) citrate or iron(2+) citrate, describes 
Ferrous citrates are produced by treating disodium citrate with sources of iron(II)
coordination complex
A coordination complex consists of a central atom or ion, which is usually metallic and is called the ''coordination centre'', and a surrounding array of bound molecules or ions, that are in turn known as ''ligands'' or complexing agents. Many ...
es containing citrate anions with Fe2+ formed in aqueous solution. Although a number of complexes are possible (or even likely), only one complex has been crystallized. That complex is the coordination polymer with the formula e(H2O)6sup>2+2.2H2O, where C6H5O73- is HOC(CH2CO2−)2(CO2−, i.e., the triple conjugate base of citric acid wherein the three carboxylic acid
In organic chemistry, a carboxylic acid is an organic acid that contains a carboxyl group () attached to an R-group. The general formula of a carboxylic acid is or , with R referring to the alkyl, alkenyl, aryl, or other group. Carboxylic ...
groups are ionized. Ferrous citrates are all paramagnetic, reflecting the weak crystal field of the carboxylate ligands.
Ferrous citrates are produced by treating disodium citrate with sources of iron(II) aquo complex
In chemistry, metal aquo complexes are coordination compounds containing metal ions with only water as a ligand. These complexes are the predominant species in aqueous solutions of many metal salts, such as metal nitrates, sulfates, and perchlorat ...
es, such as iron(II) sulfate
Iron(II) sulfate (British English: iron(II) sulphate) or ferrous sulfate denotes a range of salts with the formula Fe SO4·''x''H2O. These compounds exist most commonly as the heptahydrate (''x'' = 7) but several values for x are know ...
. Ferrous citrates are all highly unstable in air, converting to ferric citrates.
It is a nutrient supplement approved by the FDA
The United States Food and Drug Administration (FDA or US FDA) is a federal agency of the Department of Health and Human Services. The FDA is responsible for protecting and promoting public health through the control and supervision of food ...
.
See also
*Iron(III) citrate
Ferric citrate or iron(III) citrate describes any of several complexes formed upon binding any of the several conjugate bases derived from citric acid with ferric ions. Most of these complexes are orange or red-brown. They contain two or more Fe ...
* Ammonium ferric citrate
Ammonium ferric citrate (also known as Ferric Ammonium Citrate or Ammoniacal ferrous citrate) has the formula (NH4)5 e(C6H4O7)2 A distinguishing feature of this compound is that it is very soluble in water, in contrast to ferric citrate which is ...
References
Iron(II) compounds {{organic-compound-stub Citrates