2,2′-Bipyridine
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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)
(α,α′-Dipyridyl), C10H8N2 156.18 CAS RN®: 366-18-7.—White or pink, crystalline powder. Soluble in water and in alcohol. Melts at
about 69°, and boils at about 272°.
Sensitiveness: Prepare the following solutions: (A)—Dissolve 350 mg of ferrous ammonium sulfate in 50 mL of water containing 1 mL of
sulfuric acid, and add 500 mg of hydrazine sulfate, then add water to make 500 mL. For use, dilute this solution with water in the ratio of 1 in
100 mL. (B)—Dissolve 8.3 g of sodium acetate and 12 mL of glacial acetic acid in water to make 100 mL. Add 1 mL of a solution of the
specimen (1 in 1000) to a mixture of 10 mL of water and 1 mL of each of solutions A and B: a pink color results immediately.
Solubility: A 100-mg portion dissolves completely in 10 mL of water.
Residue on Ignition (Reagent test): not more than 0.2%.
