Spin Trapping of Nitric Oxide (NO·) as Aminoxyl Radicals by its Reaction with two Species of Short-Lived Radicals Derived from AZO Compounds such as 2,2′-Azobisisobutyronitrile and some Aliphatic Alcohols

Abstract

Aminoxyl radicals of the type R¹N(O·)R² are formed in the photochemical reaction between nitric oxide (NO·) and carbon-centered radicals R¹ and R²·. R¹· was formed from azo compounds such as 2,2′-azobisisobutyronitrile (AIBN): R¹· = NC-Ć(CH₃)₂, 2,2′-azobis(2,4-dimethylvaleronitrile) (AMVN): R¹· = CH₃-CH(CH₃)-CH₂-Ć(CN)CH₃, or 4,4′-azobis(4-cyanovaleric acid) (ACVA): R¹· = HOOC-(CH₂)₂-Ć(CN) CH₃· R²· was derived from aliphatic substances such as methanol, ethanol, or 2-propanol by homolytic abstraction of a hydrogen atom brought about by R¹· from the azo compounds.

Key Words:

• Nitric oxide
• aminoxyl radicals
• spin trapping
• azo compounds
• photochemistry