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Impacts of Ion-Pairing Effects on Linear and Nonlinear Photophysical Properties of Polymethines Dyes
preprintsubmitted on 22.04.2020, 17:15 and posted on 23.04.2020, 12:37 by Simon Pascal, San-Hui Chi, Joseph W. Perry, Chantal Andraud, Olivier MAURY
Ion-pairing between cationic heptamethine and small bromine anion in a non-dissociating solvent results in a symmetry breaking towards a dipolar type chromophore, a transition that is never observed in presence of a bulky B(C6F5)4 anion. For the first time, the effects of ion-pairing on the linear and nonlinear photophysical properties is investigated and reveals significant discrepancies between cyanine and dipolar states.