Formation and electronic properties of ring-oxidized and ring-reduced radical species of the phthalocyanines and porphyrins

✍ Scribed by Martin Stillman

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 48 KB
• Volume: 04
• Category: Article
• ISSN: 1088-4246
• DOI: 10.1002/(sici)1099-1409(200006/07)4:4<374::aid-jpp238>3.0.co;2-6

✦ Synopsis

The 18-π electron ring in the phthalocyanines and porphyrins largely controls their chemical and spectroscopic properties. It is the aim of this microsymposium to explore the formation and reactivities and the spectroscopic and theoretical properties of the ring-oxidized and ring-reduced phthalocyanines and porphyrins, essentially the π cation and π anion radical species. Redox chemistry of the ring, through ring oxidation and reduction to the radical species, offers powerful, new synthetic capabilities in which photochemical as well as electrochemical techniques may be used to effect highly localized reactions. The chemistry of these radical species can be moderated by control of the redox states of the central metal, the addition of electron-withdrawing or electron-donating peripheral substituents, and by the extent of intermolecular association applying both solvent polarity and peripheral substitution.