Azaporphyrins and phthalocyanines as multicentre conjugated ampholites

✍ Scribed by Pavel A. Stuzhin

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 196 KB
• Volume: 03
• Category: Article
• ISSN: 1088-4246
• DOI: 10.1002/(sici)1099-1409(199908/10)3:6/7<500::aid-jpp168>3.0.co;2-9

✦ Synopsis

Molecules of azaporphyrins combine two acidic pyrrole-type NH groups and several basic centres-two internal pyrrolenine nitrogen atoms and from one to four meso-nitrogen atoms-in one highly conjugated aromatic system. The acid-base properties of such unique multicentre ampholites have been the subject of numerous studies and discussions. Along with a short critical historical review the paper presents the latest results of a systematic investigation of the influence of successive aza substitution on the spectral properties and thermodynamic stability of the acid-base forms of azaporphyrins.