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Dependence of Rates of Interfacial Electron Transfer on Anchoring Group Debra L. Mohler, Department of Chemistry and Biochemistry,James Madison University Interfacial electron transfer (ET) from molecular adsorbates and metal or semiconductor nanoparticles/thin films is an essential process in applications including photocatalysis, solar energy conversion, and photography. The emerging field of heterogeneous photocatalysis is of particular interest for its potential to employ green methods in functionalizing petroleum-derived materials and in developing new synthetic methods. Because the rate of ET is often a key determinant of efficiency in these systems, the understanding of this process is essential for their design. Absorbance change (mOD) Absorbance change (mOD) We have prepared seminconductor nanoparticles coated with molecules that each contain a different group anchoring it to the nanoparticle; and these anchoring groups dramatically change the rate of ET. Calculations reveal that these rates correlate with electronic coupling in molecular orbitals, which can be thought of the highway for the electrons to move from the dye to the nanoparticle. 0.008 X=-COOH X=-SH X=-PO3H2 0.006 0.004 0.002 0.000 0 200 400 600 Delay time (ps) 800