Comparative studies of the catalytic properties of iron complexes with tetradentate and pentadentate aminopyridine macrocycles

INOR 229

Wanhua Ye, Wanhua.Ye@tufts.edu1, Sonia Taktak1, and Elena V. Rybak-Akimova, elena.rybak-akimova@tufts.edu2. (1) Department of Chemistry, Tufts University, 62 Talbot Ave., Medford, MA 02155, (2) Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, MA 02155
Novel iron (II) complexes with pyridine-containing macrocycles have been synthesized and characterized. They were found to catalyze epoxidation of olefins under mild conditions with H2O2 as oxidant. Crystal structure of the complexes confirmed square-pyramidal geometry of high-spin, five-coordinate complexes [Fe(L1)]2+ and square-planar coordination of the tetradentate macrocycles in low-spin [Fe(L)]2+ (L = L2, L3, L4). N-alkylated [Fe(L5)]2+ adopts a distorted structure featuring a ‘‘folded'' macrocycle. Kinetic studies of the oxidation of the complexes using stopped-flow technique identified several intermediates may be involved in catalysis.

 

Inorganic Catalysts
7:00 PM-10:00 PM, Sunday, August 19, 2007 BCEC -- Exhibit Hall - B2, Poster

Division of Inorganic Chemistry

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