International Journal of Photoenergy

International Journal of Photoenergy / 2006 / Article
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Light-harvesting J-aggregates

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Volume 2006 |Article ID 072383 | https://doi.org/10.1155/IJP/2006/72383

Andrea Lodi, Glauco Ponterini, "Aggregation modes of anionic oxacarbocyanines with polycations in solution and in ESAMs", International Journal of Photoenergy, vol. 2006, Article ID 072383, 7 pages, 2006. https://doi.org/10.1155/IJP/2006/72383

Aggregation modes of anionic oxacarbocyanines with polycations in solution and in ESAMs

Received30 Jun 2006
Revised13 Aug 2006
Accepted06 Sep 2006
Published15 Nov 2006

Abstract

Interaction of oxacarbocyanines D-G with three polycations in aqueous solutions results in the formation of two types of likely small, distorted aggregates rather than the classical J aggregates. On the contrary, the latter are extensively and almost exclusively obtained in electrostatically self-assembled multilayers (ESAMs) prepared by alternate polycation/dye adsorption on quartz substrates. The J-aggregate growth on supported polycations is qualitatively shared by the four cyanines, a fact that reveals the crucial role of the double anionic substitutions on the dyes. On the other hand, films with D and E, which are known to have a stronger tendency to give dimers in water, exhibit higher J-band intensities and stability upon drying relative to those with F and G. Based on these observations, we suggest that energetic factors associated with cofacial dye/dye van der Waals interactions, ultimately related with the degree of planarity of the conjugated chromophores, may still play a major role in controlling aggregation equilibria in these complex systems.

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Copyright © 2006 Andrea Lodi and Glauco Ponterini. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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