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CAS RN: 18390-00-6 | Product Number: A5440

PTIO (=2-Phenyl-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl) [Stable free radical reagent for the simultaneous determination of NO and NO2 in the atmosphere]

Purity: >98.0%(T)
  • 4,5-Dihydro-4,4,5,5-tetramethyl-2-phenyl-1H-imidazol-1-yloxy-1-oxide
  • 2-Phenyl-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl
5   3   17  
2   4   ≥20 

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Product Number A5440
Purity / Analysis Method >98.0%(T)
Molecular Formula / Molecular Weight C__1__3H__1__7N__2O__2 = 233.29  
Physical State (20 deg.C) Solid
Storage Temperature 0-10°C
Condition to Avoid Light Sensitive,Heat Sensitive
CAS RN 18390-00-6
Reaxys Registry Number 13743042
PubChem Substance ID 87563150
MDL Number


Appearance Blue to Dark blue powder to crystal
Purity(Nonaqueous Titration) min. 98.0 %
Lambda max. 358.0 to 362.0 nm(EtOH)
Molar extinction coefficient min. 10,000(EtOH, 358.0 to 362.0 nm)
Properties (reference)
Solubility (soluble in) Methanol
Related Laws:
Transport Information:
HS Number 2933.99.8210
PubMed Literature

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