Nonlinear absorption properties of 5,10-A2B2 porphyrins - correlation of molecular structure with the nonlinear responses
Citation:
Zawadzka M, Wang J, Blau WJ, Senge MO, Nonlinear absorption properties of 5,10-A2B2 porphyrins - correlation of molecular structure with the nonlinear responses., Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology, 12, 2013, 996 1007Download Item:
Abstract:
The nonlinear absorption properties of two series of novel free base and metalated
meso
5,10-A
2
B
2
sub-
stituted porphyrins, both bearing
p
-tolyl as an A substituent and TMS-ethynyl or bromine as a B substitu-
ent, were investigated with the open Z-scan technique at 532 nm in the ns time regime. Most of the
compounds exhibited a transmission drop with increasing input
fl
uence. This behavior is desirable for
their applications in optical limiting. More complex responses: a drop in transmission followed by an
increase in transmission or an increase in transmission followed by a transmission drop, with increasing
input
fl
uence, were detected for certain compounds. All of the recorded responses were successfully
fi
tted with a four-level model with simultaneous two-photon absorption arising from the higher excited
states (consecutive one- + one- + two-photon absorption). The TMS-ethynyl group was found to be a
more e
ffi
cient
meso
substituent in optical limiting than the bromine atom. Indium, lead and zinc com-
plexes with TMS-ethynyl substituents were the strongest positive nonlinear absorbers amongst com-
pounds studied which makes them the most interesting candidates for optical limiting application.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
SFI P.I. 09/IN.1/B265
Author's Homepage:
http://people.tcd.ie/wblauhttp://people.tcd.ie/sengem
http://people.tcd.ie/jjwang
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Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology12
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Full text availableKeywords:
positive nonlinear absorbersSubject (TCD):
Nanoscience & MaterialsDOI:
http://dx.doi.org/10.1039/C3PP25410KMetadata
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