p-Nitrobenzenediazonium Tetrafluoroborate
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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)
NO2C6H4N2BF4 236.92 CAS RN®: 456-27-9.-Yellow-gold crystals. Soluble in acetonitrile. [CAUTION-Shock-sensitive; keep refrigerated.]
ASSAY: Transfer about 30 mg, accurately weighed, to a low-actinic, 100-mL volumetric flask. Dissolve in 0.01 N hydrochloric acid, dilute with 0.01 N hydrochloric acid to volume, and mix. Using low-actinic glassware, dilute 2.0 mL of the resulting solution with spectrophotometric grade methanol to 50.0 mL. Measure the absorbance of this solution in a 1-cm cell at about 255 nm, using methanol as the blank. Calculate the absorptivity of the solution by dividing the measured absorbance by the concentration in g per mL. Calculate the assay value by the formula:
100a/59.4
in which a is the absorptivity of the solution: not less than 95.0% is found.
