Synthesis and characterization, with X-ray crystal structure, of Co(acac)2(HMTA)2

CHED 1258

Natalie A. LaFranzo, nlafranzo@bradley.edu1, Paul J. Morrison1, Edward B. Flint, eflint@bradley.edu1, Gregory M. Ferrence, ferrence@ilstu.edu2, and Matthias Zeller, mzeller@cc.ysu.edu3. (1) Department of Chemistry and Biochemistry, Bradley University, 1501 W. Bradley Avenue, Peoria, IL 61625, (2) Department of Chemistry, Illinois State University, Campus Box 4160, Normal, IL 61790-4160, (3) Department of Chemistry, Youngstown State University, 1 University Plaza, Youngstown, OH 44555-3663
The synthesis and characterization of the new coordination compound Co(acac)2(HMTA)2, (where acac = 2,4-pentanedianato and HMTA = 1,3,5,7-tetraazaadamantane) is reported. The compound is made by the addition of a chloroform solution of HMTA to a DMF solution of Co(acac)2(H2O)2 and mixing. The pink Co(acac)2(HMTA)2 can be filtered from the solution after 30 minutes with a 75% yield. FTIR spectroscopy indicates that both HMTA peaks and Co(acac)2 peaks have shifted as a result of coordination. Single crystals suitable for X-ray analysis were grown by slow diffusion of solutions of HMTA in CHCl3 and Co(acac)2(H2O)2 in DMF. The structure shows the two HMTA ligands trans to each other in axial positions, with the acac ligands planar in the equatorial positions. Analysis of the XRD spectrum of the bulk powder gives the same cell dimensions as the single crystal analysis.
 

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