Unequivocal evidence about the presence of Fe(III) in µ-oxo-bis[tetrakis(t-butyl)phthalocyaninatoiron]

✍ Scribed by Claudio Ercolani; Fabrizio Monacelli

• Book ID: 102399785
• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 113 KB
• Volume: 05
• Category: Article
• ISSN: 1088-4246
• DOI: 10.1002/jpp.376

✦ Synopsis

μ-Oxo-bis[tetrakis(t-butyl)phthalocyaninatoiron] (1) reacts with L-ascorbic acid (LAA) in pyridine containing CH ~2~ Cl ~2~ under strictly anaerobic conditions to yield dehydroascorbic acid (DHA) and Pc ^t^ Fe^II^ ( py )~2~ (Pc^t^ = tetrakis (t-butyl)phthalocyaninato dianion). The reaction is quantitative with a 1:1 LAA/1 stoichiometric ratio. This result can be explained only if it is assumed that the μ-oxo complex 1 (reacting as the bispyridine adduct) is an iron(III) complex able to oxidise LAA to DHA quantitatively. Present findings definitively rule out the alternative iron(II) structure H ~2~[( Pc ^t^ Fe )~2~ O ] which has been assigned to compound 1 by other authors.