5-Nitro-1,10-phenanthroline
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
C12H7N3O2 225.20 CAS RN: 4199-88-6.—White powder. Soluble in water.
Melting Range 〈741〉: between 198° and 200°.
Suitability as Redox Indicator: Dissolve 25 mg in a minimum volume of diluted sulfuric acid, add 10 mg of ferrous sulfate, and dilute with water to 100 mL: the solution is deep red in color and exhibits an absorption maximum at 510 nm. To 1.0 mL of the solution add 1.0 mL of 0.01 M ceric sulfate: the red color is discharged.
