A blood-red complex of Fe
2+ ion with 1,10-phenanthroline, used as a redox indicator. Ferroin changes from red to pale blue when oxidized.
Found on
http://antoine.frostburg.edu/chem/senese/101/glossary/f.shtml
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. ==Redox indicator== This coordination compound is used as an indicator in analytical chemistry. The active ingredi.....
Found on
http://en.wikipedia.org/wiki/Ferroin
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