Platinum(II) thiacrown complexes with chiral and achiral diphosphine ligands

CHED 1229

Emily R. Hassler, Emily-Hassler@utc.edu1, Gregory J. Grant, Greg-Grant@utc.edu2, and Daron E. Janzen, Daron-Janzen@utc.edu2. (1) Department of Chemistry, University of Tennessee at Chattanooga, 803 1/2 Central Ave., Chattanooga, TN 37403, (2) Chemistry Department, University of Tennessee at Chattanooga, 615 McCallie Avenue, Chattanooga, TN 37403
We report the synthesis of six new Pt(II) compounds which contain the crown trithioether 9S3 (1,4,7-trithiacyclononane) and a diphosphine ligand. We have used the chiral diphosphine ligands 2,3-O-isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane (DIOP) and (R)-(+)-1,2-bis(diphenylphosphino)propane (R-PROPHOS) and the achiral diphosphine ligands cis-1,2-bis(diphenylphosphino)ethylene (cis-dppv), trans-1,2-bis(diphenylphosphino)ethylene (trans-dppv), and 1,1-bis(diphenylphosphino)ethylene (1,1-dppv) in our study. These complexes have a general formula of [Pt(9S3)(L)](PF6)2 (L=DIOP, R-PROPHOS, cis-dppv, or 1,1-dppv). Trans-dppv and DIOP can also form a complex of the general formula [Pt2(9S3)2(L)2](PF6)4. The structures of the cis-dppv and R-PROPHOS complexes have been solved by X-ray diffraction. The former compound shows a square planar S2P2 arrangement around the Pt(II) with a long distance interaction between the third sulfur of the 9S3 and the platinum center. In the R-PROPHOS case, we see ligand displacement of 9S3 and the formation of a bis R-PROPHOS complex.
 

Undergraduate Research Poster Session: Inorganic Chemistry
2:00 PM-4:00 PM, Monday, March 26, 2007 Hyatt Regency Chicago -- Riverside Center, Poster

Division of Chemical Education

The 233rd ACS National Meeting, Chicago, IL, March 25-29, 2007