The triplet state of 4-nitronaphthylamine

✍ Scribed by C. Capellos; F. Lang

• Publisher: John Wiley and Sons
• Year: 1977
• Tongue: English
• Weight: 317 KB
• Volume: 9
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550090310

✦ Synopsis

Abstract

Nanosecond spectroscopic and kinetic studies of 4‐nitronaphthylamine (4‐NO~2~NA) in aerated and deaerated nonpolar solvents at room temperature show a transient species with absorption maxima at 470 and 665 nm. The rate constant for the decay of this species in deaerated benzene is 6.7 × 10^5^ sec^−1^, while in aerated benzene solutions the species is quenched by oxygen with arate constant k = 2.0 × 10^9^M^−1^·sec^−1^. The transient absorption at 470and 665 nm is assigned to the lowest triplet excited state of 4‐NO~2~NA. In polar solvents, however, electronic excitation of 4‐NO~2~NA does not lead to any detectable transient absorption between 400 and 800 nm for the temperature range of 25 to −150°C. This is attributed to lack of intersystem crossing of 4‐NO~2~NA in polar solvents.