Isolation and characterization of two group IV metal (Zr and Hf) complex substituted semivacant Wells-Dawson polyoxotungstates

INOR 692

Yu Hou1, Xikui Fang, xfang@emory.edu2, Kenneth Hardcastle, khardca@emory.edu2, and Craig L. Hill, chill@emory.edu3. (1) Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322, (2) X-ray Crystallography Center, Department of Chemistry, Emory University, Atlanta, GA 30322, (3) Department of Chemistry, Emory University, Atlanta, 1515 Dickey Drive, Atlanta, GA 30322
Semivacant Wells-Dawson polyoxotungstates (in which one of the heteroatoms is missing) are less studied compared to Wells-Dawson-type polyoxometalates and their derivatives. We report two new group IV metal complex substituted Wells-Dawson-type tungstomonophosphates, [(CH3)2NH2]9[α2-Zr(L-malate)(H4PW17O61]•12H2O (DMA1) and [(CH3)2NH2]9[α2-Hf(L-malate)(H4PW17O61]•13H2O (DMA2), which were prepared from the reaction of a group IV metal salt (HfIV/ZrIV), L-malic acid and [H4PW17O62]11-. Compound DMA1 crystallizes in trigonal space group P3(1), with a = 13.582(4) Å, b = 13.582(4) Å, c = 43.327(18) Å, α = 90º, β = 90º, γ = 120º, V = 6922(4) Å3, Z = 3, and compound DMA2 also crystallizes in P3(1), with a = 13.544 (5) Å, b = 13.544 (5) Å, c = 43.17(2) Å, α = 90º, β = 90º, γ = 120º, V = 6858(5) Å3, Z = 3. Both compounds have been further characterized by 31P NMR, FT-IR, and other techniques.
 

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