Substituent effects on electron exchange in phenoxide-bridged dimanganese complexes

CHED 452

Sarah E. Kelley, sek11@albion.edu1, Monica Soler, msoler@cem.msu.edu2, Lynn Cargill2, Dong Guo, dguo@chemistry.msu.edu2, James K. McCusker, jkm@chemistry.msu.edu2, and Vanessa P. McCaffrey, vmccaffrey@albion.edu1. (1) Department of Chemistry, Albion College, Albion, MI 49224, (2) Department of Chemistry, Michigan State University, East Lansing, MI 48824-1322
A series of dinuclear metal complexes are being prepared in order to examine the correlation between superexchange interactions and the charge/spin polarization associated with the bridging atom(s). A macrocyclic ligand derived from the condensation of 2,6-diformyl-4-methylphenol and bis(2-aminoethyl)-N-methylamine in the presence of Mn(OAc)2 results in the formation of a dinuclear metal complex in which the oxygen atoms of two phenoxyl groups propagate antiferromagnetic exchange between two high-spin MnII ions. The goal of the research is to determine the extent to which the measured exchange interaction correlates with charge density (as gauged by the Hammett parameter of the para substituent) and/or spin density of the bridge. The synthesis of several complexes where methyl is substituted for other R groups along with preliminary results from variable-temperature magnetic susceptibility measurements will be presented.
 

Undergraduate Research Poster Session: Organic Chemistry
11:00 AM-1:00 PM, Monday, April 7, 2008 Morial Convention Center -- Hall A, Poster

Division of Chemical Education

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008