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.
Aggregation modes of anionic oxacarbocyanines with polycations in solution and in ESAMs / Lodi, A; Ponterini, Glauco. - In: INTERNATIONAL JOURNAL OF PHOTOENERGY. - ISSN 1110-662X. - ELETTRONICO. - 2006(2006), pp. 1-7.
Data di pubblicazione: | 2006 | |
Titolo: | Aggregation modes of anionic oxacarbocyanines with polycations in solution and in ESAMs | |
Autore/i: | Lodi, A; Ponterini, Glauco | |
Autore/i UNIMORE: | ||
Rivista: | ||
Volume: | 2006 | |
Pagina iniziale: | 1 | |
Pagina finale: | 7 | |
Codice identificativo ISI: | WOS:000242570900001 | |
Codice identificativo Scopus: | 2-s2.0-34547648606 | |
Citazione: | Aggregation modes of anionic oxacarbocyanines with polycations in solution and in ESAMs / Lodi, A; Ponterini, Glauco. - In: INTERNATIONAL JOURNAL OF PHOTOENERGY. - ISSN 1110-662X. - ELETTRONICO. - 2006(2006), pp. 1-7. | |
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