Iron(II) tetraanthracenylporphyrazine: A sterically hindered complex binds CO but not O2

INOR 747

Joshua R. Lebenson, m073714@usna.edu, Chemistry Department, U. S. Naval Academy, 572 Holloway Road, Annapolis, MD 21402 and Jeffrey P. Fitzgerald, fitzgera@usna.edu, Department of Chemistry, U.S. Naval Academy, 572 Holloway Road, Annapolis, MD 21402.
An iron(II) porphyrazine complex bearing four peripheral anthraceno groups has been synthesized and fully characterized. The anthaceno groups, which form the sides and rim of a “bowl” on each face of the porphyrazine plane, prevent macrocycle dimerization reactions but do not prevent the binding of small molecules to the iron center. Unlike all iron(II) porphyrins and porphyrazines reported to date, this complex has no measurable affinity for O2, yet readily binds CO and nitrogenous bases. The low O2 affinity, which is likely a result of an unusually high Fe(II/III) redox couple, suggests application as a CO sensor. The synthesis, characterization and coordination chemistry of this complex, including equilibrium binding constants, will be presented.
 

Structural, Functional and Biomimetic Modeling in Bioinorganic Chemistry
7:00 PM-10:00 PM, Tuesday, March 27, 2007 Hyatt Regency Chicago -- Riverside Center, Poster

Sci-Mix
8:00 PM-10:00 PM, Monday, March 26, 2007 Hyatt Regency Chicago -- Riverside Center, Sci-Mix

Division of Inorganic Chemistry

The 233rd ACS National Meeting, Chicago, IL, March 25-29, 2007