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6 March 2013 Symmetry loss of heptamethine cyanines: an example of dipole generation by ion-pairing effect
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Abstract
The development of near-infrared dyes for third order nonlinear optical applications and particularly for optical power limiting at telecommunications wavelengths triggered the revival of old dyes like polymethine dyes featuring an odd number of carbon atoms. Currently numerous research endeavor is focused on the understanding of their spectroscopy in solution and in the solid state in close relationship with their electronic structure. In this context, the dramatic effect of the counter ion on the heptamethine optical properties was highlighted depending on the dissociating character of the media. The unusual consideration of this parameter allows us to explore the so-called “cyanine limit” and to finely tune the heptamethine absorption in view of future use as dopant in a material for optical limiting applications.
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Simon Pascal, Pierre-Antoine Bouit, Boris Le Guennic, Stéphane Parola, Olivier Maury, and Chantal Andraud "Symmetry loss of heptamethine cyanines: an example of dipole generation by ion-pairing effect", Proc. SPIE 8622, Organic Photonic Materials and Devices XV, 86220F (6 March 2013); https://doi.org/10.1117/12.2008220
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