Axial coordination of azaferrocene and dioxygen to cobalt(II) porphyrins. Photochemistry of six-coordinated adducts

✍ Scribed by J. Zakrzewski; C. Giannotti

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 617 KB
• Volume: 57
• Category: Article
• ISSN: 1010-6030
• DOI: 10.1016/1010-6030(91)85040-n

✦ Synopsis

The coordination of azaferrocene to cobalt(B) porphyrins (COP) and the photochemistry of the resulting five-and six-coordinated complexes were studied by electron spin resonance spectroscopy. The five-coordinated complexes COP(B) (B = azaferrocene) are photostable, whereas the six-coordinated complexes Cop(B)(L) (L= O2 or B) eject L on irradiation with visible light. Two alternative mechanisms for the photoejection of O2 are proposed. The first involves a photoinduced electron transfer between the cobalt(III) and iron(I1) centres in the six-coordinated dioxygen complex and the second is based on the photoejection of azaferrocene (4) from this complex.