A disorder-free beta-Keggin monomer: Diiron substituted silicontungstate, (Me2NH2)4H4[FeIII2Cl2SiW10O38]•9H2O, and ligand exchange reactions on the iron site

INOR 705

Cindee Yates, cindee.yates@emory.edu, Rui Cao, rcao@emory.edu, Kenneth I. Hardcastle, and Craig L. Hill, chill@emory.edu. Department of Chemistry, Emory University, 1515 Dickey Dr, Atlanta, GA 30322
Keggin and Wells-Dawson polyoxometalates (POMs), in part because of their extensively alterable properties, are of proven value in catalysis. Some multi-Fe POMs are of current interest because they catalyze green oxidations. In this context we report the synthesis and characterization of a monomeric beta-diiron Keggin derivative, (Me2NH2)4H4[FeIII2Cl2SiW10O38]•9H2O (1) that crystallizes in the monoclinic space group P2(1)/n, with a = 17.1605(12) Å, b = 16.7439(11) Å, c = 19.3060(13) Å, β = 92.262(2)º, V = 5542.9(6) Å3, Z = 4. The terminal chloride ions can be exchanged for azide. These complexes have been characterized by FTIR and other methods. Their physicochemical and reactivity properties will be described.
 

Polyoxometalates and Related Clusters in Chemistry and Nanoscience
7:00 PM-10:00 PM, Tuesday, August 21, 2007 BCEC -- Exhibit Hall - B2, Poster

Division of Inorganic Chemistry

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