| Ferroin | |
|---|---|
![The structure of the [Fe(o-phen)3]2+ complex cation in ferroin](http://en.wikipedia.org/wiki/File:Ferroin-cation-3D-balls.png) |
|
| 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]
|
| ChemSpider ID | 1278 |
| Properties | |
| Molecular formula | C36H24FeN6+2 |
| Molar mass | 596.27 (g/mol) |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
| Infobox references | |
Ferroin is the chemical compound with the formula [Fe(o-phen)3]SO4, where o-phen is an abbreviation for 1,10-phenanthroline.
Redox indicator
| Phenanthroline Fe(II) (Redox indicator) | ||
| E0= 1.06V | ||
| Reduced | ↔ | Oxidized |
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.
Preparation
Ferroin sulfate may be prepared simply by adding phenanthroline to ferrous sulfate in water.
- 3 phen + FeSO4 → [(o-phen)3Fe]SO4
References
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