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High-Resolution Photochemical Reaction Using Triplet-Sensitizer Probes

Published online by Cambridge University Press:  01 February 2011

Hideki Miki ,
Akira Otomo  and
Shinro Mashiko
Hideki Miki
Affiliation:
Kansai Advanced Research Center, National Institute of Information & Communications Technology, 588–2 Iwaoka, Nishi-ku, Kobe 651–2492, Japan
Akira Otomo*
Affiliation:
Kansai Advanced Research Center, National Institute of Information & Communications Technology, 588–2 Iwaoka, Nishi-ku, Kobe 651–2492, Japan
Shinro Mashiko
Affiliation:
Kansai Advanced Research Center, National Institute of Information & Communications Technology, 588–2 Iwaoka, Nishi-ku, Kobe 651–2492, Japan
*
† Corresponding author.
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Abstract

We propose molecular-scale photochemical-reaction control using triplet-triplet (T-T) energy transfer from a donor molecule attached on a probe to an acceptor on an insulator surface. In this work, we studied the feasibility of photochemical reactions on a substrate surface using a triplet sensitizer probe. We observed an efficient T-T energy transfer from Michler's ketone on the substrate to an acceptor molecule, cinnamoyl group, on the other substrate facing it. Approximately a quarter of the cinnamoyl groups were dimerized by triplet sensitization. We used a cone-shaped dendron molecule to avoid sensitizer self-quenching caused by the triplet energy migration within the probe surface. We then confirmed efficient site separation of the cone's focal point by measuring the absorption and fluorescent properties of the rhodamine B attached to the focal point. The generation-three dendrons provide enough distance between the functional sites on the probe to reduce singlet energy transfer and it should control triplet energy migration.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 838: Symposium O – Scanning Probe and Other Novel Microscopies of Local Phenomena in Nanostructured Materials , 2004 , O14.6
Copyright
Copyright © Materials Research Society 2005

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References

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