|Jmol-3D images||Image 1|
|Molar mass||596.27 g/mol|
| (what is: / ?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Ferroin is the chemical compound with the formula [Fe(o-phen)3]SO4, where o-phen is an abbreviation for 1,10-phenanthroline, a bidentate ligand. The term "ferroin" is used loosely and includes salts of other anions such as chloride.
|Phenanthroline Fe(II) (Redox indicator)|
|E0= 1.06 V|
This coordination compound is used as an indicator in analytical chemistry. The active ingredient is the [Fe(o-phen)3]2+ ion, which is a chromophore that can be oxidized to the ferric derivative [Fe(o-phen)3]3+. The potential for this redox change is +1.06 volts in 1M H2SO4.
Ferroin sulfate may be prepared by combining phenanthroline to ferrous sulfate in water.
- 3 phen + Fe2+ → [Fe(phen)3]2+
The iron is low spin and octahedral with D3 symmetry. The intense color of this ferrous complex arises from a metal-to-ligand charge-transfer transition.
- D. C. Harris "Quantitative Chemical Analysis" 4th edition, W. H. Freeman, NY. ISBN 0-7167-2508-8.