Translator Disclaimer
12 February 2009 Two-photon absorption spectroscopy of corroles
Author Affiliations +
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.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Aleks Rebane, Nikolay Makarov, Mikhail Drobizhev, Beata Koszarna, Michal Galezowski, and Daniel T. Gryko "Two-photon absorption spectroscopy of corroles", Proc. SPIE 7213, Organic Photonic Materials and Devices XI, 72130Q (12 February 2009);

Back to Top