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Syntheses and Optical Limiting Characterizations of a Series of Porphyrin-Buckminsterfullerene Dyads

Published online by Cambridge University Press:  10 February 2011

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

We report herein the syntheses and optical limiting characterizations of a series of porphyrin-C60 dyads in which the porphyrin and C60 moieties are held within close proximity of one another by an o-phenylene bridge. The electron-donating ability of the porphyrin moiety in the dyads is systematically varied through chemical modification. This allows us to control the ease of electron transfer from the porphyrin to the C60 moiety in these dyads. Optical limiting measurements at 532 nm using 3-ns pulses show that the limiting performances of the dyads are poorer relative to their model compounds. This could be due to an ultra-short lifetime for the charge-separated species or a depopulation of the triplet states by photoinduced electron transfer. The optical limiting performances of the free-base porphyrin-C60 dyads are also related to the electron- donating abilities of the meso substituents of the porphyrin moieties. 12PorphyC 60 displays better limiting performance at 532 nm (with 3-ns and 15-ns pulses) compared to Val12PorphyC 60 . This trend has been rationalized in terms of the relative energies of the first excited singlet and triplet states of the fullerene moiety and the charge-separated state of the dyads.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 597: Symposium PP – Thin Films for Optical Waveguide Devices & Materials … , 1999 , 425
Copyright
Copyright © Materials Research Society 2000

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