Iron(II) citrate

That complex is the coordination polymer with the formula [Fe(H2O)6]2+{[Fe(C6H5O7)(H2O)]−}2.2H2O, where C6H5O73- is HOC(CH2CO2−)2(CO2−, i.e., the triple conjugate base of citric acid wherein the three carboxylic acid groups are ionized.

[3] Ferrous citrates are all paramagnetic, reflecting the weak crystal field of the carboxylate ligands.

[4] Ferrous citrates are produced by treating disodium citrate Na2C6H6O7 with sources of iron(II) aquo complexes, such as iron(II) sulfate.

It is a nutrient supplement approved by the FDA.

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Structure of the anionic coordination polymer {[Fe(C 6 H 5 O 7 )(H 2 O)] − } n . [ 3 ] (legend: red = O, gray = C, blue = Fe, white = H).