Ferroin

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Ferroin
The structure of the [Fe(o-phen)3]2+ complex cation in ferroin
Identifiers
CAS number [14634-91-4]
PubChem 84602
SMILES C1=CC2=C(C3=C(C=CC=N3)C=C2)N=C1. C1=CC2=C(C3=C(C=CC=N3)C=C2)N=C1. C1=CC2=C

(C3=C(C=CC=N3)C=C2)N=C1. [Fe+2]
Properties
Molecular formula C36H24FeN6+2
Molar mass 692.52
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references

Ferroin is the chemical compound with the formula [Fe(o-phen)3]SO4, where o-phen is an abbreviation for 1,10-phenanthroline. This coordination compound is used as an indicator in analytical chemistry. The active ingredient is the [Fe(o-phen)3]2+ ion, which is the redox-active chromophore. Ferroin includes other salts of the same basic dication.

Its redox potential is +1,06 volts in 1M H2SO4.

[edit] Preparation of reagent

A solution of 1.485 g 1,10-phenanthroline monohydrate is added to a solution of 695 mg FeSO4·7H2O in water, and the resulting red solution is diluted to 100 mL.

[edit] References

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