Thermodynamic studies relevant to hydrogen atom transfer in iron imido complexes

INOR 616

Ismael Nieto, nitero@hotmail.com1, Eileen Duesler2, and Jeremy M. Smith, jesmith@nmsu.edu1. (1) Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003, (2) Department of Chemistry, University of New Mexico, Albuquerque, NM 87131
Hydrogen atom transfer reactions involving metal oxos are important in biological processes (e.g., H2O oxidation by Photosystem II). We are investigating the thermodynamic barriers relevant to this transformation in metal imido model complexes supported by the tris(N-mesitylcarbene)phenylborate ligand, LMes. For example, four-coordinate iron(III) imido (LMesFeNR) complexes can be prepared from the corresponding iron(II) amidos (LMesFeNHR) via hydrogen atom transfer. The thermodynamic barriers towards proton, electron and hydrogen atom transfer have been investigated by thermochemical measurements. Investigations into the effect of metal oxidation state on these barriers have also been conducted.
 

Inorganic Modeling of Biological Systems
7:00 PM-10:00 PM, Tuesday, August 21, 2007 BCEC -- Exhibit Hall - B2, Poster

Sci-Mix
8:00 PM-10:00 PM, Monday, August 20, 2007 BCEC -- Exhibit Hall - B2, Sci-Mix

Division of Inorganic Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007