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Synthesis and Optical Limiting Characterization of a Porphyrin-Buckminsterfullerene Dyad

Published online by Cambridge University Press:  10 February 2011

Kenneth J. McEwan
Affiliation:
Defence Evaluation and Research Agency, Malvern, Worcs, WR14 3PS, United Kingdom
Keith L. Lewis
Affiliation:
Defence Evaluation and Research Agency, Malvern, Worcs, WR14 3PS, United Kingdom
How-Ghee Ang
Affiliation:
DSO National Laboratories, 20 Science Park Drive, Singapore, 118230
Zhi-Heng Loh
Affiliation:
DSO National Laboratories, 20 Science Park Drive, Singapore, 118230
Leng-Leng Chng
Affiliation:
DSO National Laboratories, 20 Science Park Drive, Singapore, 118230
Yiew-Wang Lee
Affiliation:
DSO National Laboratories, 20 Science Park Drive, Singapore, 118230
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Abstract

The optical limiting performances of donor-buckminsterfullerene (C60) dyads have hitherto been unreported. The predicted large excited state absorption cross-section of such dyads in their charge-separated states would enable them to exhibit enhanced optical limiting relative to their individual components. We report herein the synthesis and optical limiting characterization of a novel porphyrin-buckminsterfullerene dyad, in which the porphyrin and C60 moieties are held within close proximity of one another by an o-phenylene bridge. The porphyrin-C60 dyad was synthesized via 1,3-dipolar azomethine ylide cycloaddition, and was obtained in 37.0% yield. Optical limiting measurements at 532 nm using 3-ns pulses show that the limiting performance of the dyad is poorer compared to its model compounds. Possible reasons for the worsened performance of the dyad will be discussed.

Type
Research Article
Copyright
Copyright © Materials Research Society 1999

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References

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