Aggregation modes of anionic oxacarbocyanines with polycations in solution and in ESAMs
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-as...
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| Format: | Article |
| Language: | English |
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Wiley
2006-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/IJP/2006/72383 |
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| author | Andrea Lodi Glauco Ponterini |
| author_facet | Andrea Lodi Glauco Ponterini |
| author_sort | Andrea Lodi |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-1191ef3312d0465a9c7c42392a425a0f |
| institution | Kabale University |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2006-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-1191ef3312d0465a9c7c42392a425a0f2025-02-03T06:10:58ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2006-01-01200610.1155/IJP/2006/7238372383Aggregation modes of anionic oxacarbocyanines with polycations in solution and in ESAMsAndrea Lodi0Glauco Ponterini1Dipartimento di Chimica, Università di Modena e Reggio Emilia and INSTM, Via Campi 183, Modena 41100, ItalyDipartimento di Chimica, Università di Modena e Reggio Emilia and INSTM, Via Campi 183, Modena 41100, ItalyInteraction 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.http://dx.doi.org/10.1155/IJP/2006/72383 |
| spellingShingle | Andrea Lodi Glauco Ponterini Aggregation modes of anionic oxacarbocyanines with polycations in solution and in ESAMs International Journal of Photoenergy |
| title | Aggregation modes of anionic oxacarbocyanines with polycations in solution and in ESAMs |
| title_full | Aggregation modes of anionic oxacarbocyanines with polycations in solution and in ESAMs |
| title_fullStr | Aggregation modes of anionic oxacarbocyanines with polycations in solution and in ESAMs |
| title_full_unstemmed | Aggregation modes of anionic oxacarbocyanines with polycations in solution and in ESAMs |
| title_short | Aggregation modes of anionic oxacarbocyanines with polycations in solution and in ESAMs |
| title_sort | aggregation modes of anionic oxacarbocyanines with polycations in solution and in esams |
| url | http://dx.doi.org/10.1155/IJP/2006/72383 |
| work_keys_str_mv | AT andrealodi aggregationmodesofanionicoxacarbocyanineswithpolycationsinsolutionandinesams AT glaucoponterini aggregationmodesofanionicoxacarbocyanineswithpolycationsinsolutionandinesams |