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linear/ribbon-like, or NPNs of Pd when a Pd : peptide ratio of 60,
90, or 120, respectively, is employed. Additionally, the catalytic
capabilities for each of the three systems were analyzed for C-
coupling via the Stille reaction using a water based solvent at
room temperature. Such conditions were employed due to the
biologically-based structures of the materials. The catalytic
results suggest that the individual system reactivities are
controlled by two specific factors: the metallic surface area and
the proximity of the metal to the surface of the peptide frame-
work. These results are important in determining structure/
function relationships for nanocatalysts and can be used as
model systems to elucidate attractive structure attributes to
achieve new and enhanced catalysts. Furthermore, the diffused
peptide framework encapsulating the Pd nanostructures may
prove useful in the development of selective catalysts that employ
the biomimetic scaffold as a gate. Such studies are presently
underway in our laboratories.
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Acknowledgment is made to the Donors of the American
Chemical Society Petroleum Research Fund for partial support
of this research with further support from the University of
Kentucky also acknowledged. We thank L. Jackson and Dr B. C.
Lynn for MALDI-TOF characterization of the synthesized
peptides.
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