Abstract
In this work, the one- and two- photon absorption of polyaryl substituted pyridine were investigated theoretically. The considered compounds have been reported in a previous work to be of appreciable fluorescence quantum yield in the visible domain. Herein, their two-photon absorption cross section at the maximum linear absorption wavelength was found to be ranged between 20 and 250GM, conferring to these compounds moderate to strong two-photon activity. Two-photon absorption cross section was enhanced by the presence of electrons donor (ED) and acceptor (EW) groups, positioned in the same plan and branched to the pyridine in a linear ED-pi-EW configuration. We found by considering the MOs involved in the linear absorption that, the nonlinear absorption in the considered pyridines was a two states process, governed by intramolecular-charge transfer excitation. These compounds can serve as starting structure for the designing of new molecular probes for environment sensing based on two-photon absorption process.
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