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Proceedings Paper

Two-photon absorption spectroscopy of corroles
Author(s): Aleks Rebane; Nikolay Makarov; Mikhail Drobizhev; Beata Koszarna; Michal Galezowski; Daniel T. Gryko
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Paper Abstract

We report simultaneous two-photon absorption (2PA) spectra in a series of substituted corroles and related porphyrins in 800-1400 nm laser wavelength range. Compared to the porphyrins, the 2PA spectrum of corroles contains a distinct and relatively high intensity peak, sigma(2) = 60-130 GM, close to twice the wavelength of Soret maximum (800-850 nm). The increase of 2PA peak cross section is explained in terms of decreased symmetry of the contracted macro-cycle, and is most likely related to relaxing of the parity selection rules that restrict 2PA in the Soret band for more symmetrical porphyrins. We also observe that the strength of the 2PA peak in Soret region decreases with the electron-withdrawing ability (increasing Hammett constant) of the side substituents, which can be explained by assuming that the corrole core itself possesses electron-accepting ability. The peak 2PA cross sections in the Q-region are much less than in Soret-region, and can be quantitatively described within the two-level approximation taking into account permanent dipole moments in the ground and excited states.

Paper Details

Date Published: 12 February 2009
PDF: 9 pages
Proc. SPIE 7213, Organic Photonic Materials and Devices XI, 72130Q (12 February 2009);
Show Author Affiliations
Aleks Rebane, Montana State Univ., Bozeman (United States)
National Institute of Chemical Physics and Biophysics (Estonia)
Nikolay Makarov, Montana State Univ., Bozeman (United States)
Mikhail Drobizhev, Montana State Univ., Bozeman (United States)
Beata Koszarna, Institute of Organic Chemistry (Poland)
Michal Galezowski, Institute of Organic Chemistry (Poland)
Daniel T. Gryko, Institute of Organic Chemistry (Poland)

Published in SPIE Proceedings Vol. 7213:
Organic Photonic Materials and Devices XI
Robert L. Nelson; François Kajzar; Toshikuni Kaino, Editor(s)

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