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REU

May 4, 2005

FRONTIERS IN MATERIALS SCIENCE
VINSE COLLOQUIUM SERIES

Dr. Hector Abruna
Cornell University
"Redox and Photoactive Nanometric Building Blocks"

Abstract.  The presentation will focus on the synthesis and characterization of molecular assemblies, based on transition metal complexes and electronically conducting polymers, of deliberate design, for application in molecular devices.  We have prepared and characterized single-molecule devices incorporating transition metal complexes designed so that electron transport occurs through well-defined charge states of a single molecule.  We have examined two related molecules containing a Co ion bonded to polypyridyl ligands, attached to insulating tethers of different lengths.  Changing the length of the insulating tether alters the coupling of the ion to the electrodes, enabling the fabrication of devices that exhibit either Coulomb Blockade or the Kondo effect.  The use of more complex molecular architectures as well as of electronically conducting polymers will also be discussed.  

 
 
Vanderbilt University