4-(2-Pyridylazo)resorcinol 96%, Sigma-Aldrich®

Supplier: SIGMA-ALDRICH MICROSCOPY

Synonyms: 4-(2'-Pyridylazo)resorcinol

M-Clarity™ quality level = MQ200

323209-25G 323209-5G
323209-25GEA 919 EUR
323209-25G 323209-5G
4-(2-Pyridylazo)resorcinol 96%, Sigma-Aldrich®
4-(2-Pyridylazo)resorcinol

4-(2-Pyridylazo)resorcinol (PAR) is a monosodium salt(1), dibasic acid that forms the protonated complexes with most metal ions.


4-(2-Pyridylazo)resorcinol (PAR) serves as a metallochromic indicator and is suitable as a chromogenic agent for the quantitative determination of over 50 elements.

Formula: C₁₁H₉N₃O₂
MW: 215,21 g/mol
Melting Pt: 192,..202 °C (lit.)
Storage Temperature: Room Temperature
MDL Number: MFCD00044237
CAS Number: 1141-59-9
EINECS: 214-528-6
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Specification Test Results

Appearance (colour) Conforms to requirements
Appearance (form) Powder
Purity (HPLC area %) ≥95.5 %
Carbon content 58.6 - 64.2 %
Nitrogen content 18.6 - 20.4 %
Infrared spectrum Conforms to structure

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