Synthesis and structural characterization of diiron(II) paddlewheel complexes of the type [Fe2(µ-O2Ctrp)4(L)2] bridged by triptycene carboxylates (-O2Ctrp)

INOR 615

Simone Friedle, friedle@lippard.mit.edu, Jeremy J. Kodanko, kodanko@lippard.mit.edu, Kyrstin L. Fornace, kfornace@mit.edu, and Stephen Lippard. Department of Chemistry, Massachusetts Institute of Technology, Building 18 Room 498, 77 Massachusetts Institute of Technology, Cambridge, MA 02139
Carboxylate-bridged diiron centers are encountered at the active sites of several non-heme diiron enzymes. The synthesis of discrete dinuclear iron(II) complexes that mimic the active site of such enzymes has been achieved with the use of sterically demanding carboxylates. Here we report the use of 9-triptycene carboxylate (-O2Ctrp), a ligand that facilitates the assembly of quadruply bridged diiron(II) complexes having the general formula [Fe2(µ-O2Ctrp)4(L)2]. An increase in the steric bulk of the neutral donor ligand L leads to an increase in the distances between the iron atoms, but the interlocking nature of the triptycene moietites across the metal-metal vector prohibits carboxylate shifts and formation of the windmill isomers. The structures, physical properties, and reactivity of these compounds will be presented.

 

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