Ferroin

  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.

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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.

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

Key data: CAS = [14634-91-4], MW = 692.52.