Electrochemical studies on sila and stanna-mesocyclic dichalcogenoethers

INOR 197

Richard S. Glass, rglass@u.arizona.edu1, Dennis H. Evans, dhevans@email.arizona.edu1, Eric Block, eb801@albany.edu2, Uzma I. Zakai, zakaiu@email.arizona.edu1, Norma Macias3, and Jin Jin2. (1) Department of Chemistry, The University of Arizona, P O Box 210041, 1306 E. University Blvd., Tucson, AZ 85721-0041, (2) Department of Chemistry, University at Albany, Albany, NY 12222, (3) Facultad de Quimica, UNAM, Av. Universidad 3000, Mexico City, 04510, Mexico
Electrochemical oxidation of 1,5-dithiacyclooctane (DTCO), 1a, involves a two-electron reversible process. The two electrons are removed stepwise but a single oxidation peak is observed because the cation radical is oxidized more readily than DTCO itself! Similarly, the electrochemical oxidation of 1,5-diselenocyclooctane (DSeCO), 2a, is also reversible. We have now found 3a or ditellurocyclooctane (DTeCO), 3a, also undergoes a reversible, two-electron oxidation. However, cyclic voltammetric studies with silicon and tin substituted in the aforementioned chalcogen-chalcogen mesocycles show irreversible oxidations. Unlike 1b-e and 2b-c silatellurium compounds 3b and 3c undergo reversible oxidation which have been fitted by simulations. The chemical basis for these results will be presented.

 

Electrochemistry
7:00 PM-10:00 PM, Sunday, 10 September 2006 Moscone Center -- Hall D, Poster

Division of Inorganic Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006