SISMA · Supramolecular Interactions in Smart Materials
FP6 — Marie Curie Actions (Human Resources and Mobility)
- Duration
- 2004-04-01 → 2005-09-30
- EU contribution
- €113,670
- Participants
- 1
- Scheme
- EIF
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Results in brief
Final Activity Report Summary - SISMA (Supramolecular Interactions in Smart Materials)
Spectroscopic properties of isolated dipolar chromophores and small multichromophoric assemblies containing the same chromophores have been experimentally investigated. Spectroscopic differences between these two cases, resulting from supramolecular interactions, have been analysed and interpreted through a theoretical model proposed by the fellow. The importance of self-organisation driven by interchromophore interactions in the case of flexible multichromophores has been pointed out. In the case of multipolar systems, obtained by branching of dipolar units via a common core, the fundamental role of coherent interactions, non-electrostatic in nature, has been demonstrated. The effect is a strong cooperative enhancement of nonlinear optical properties such as two-photon absorption (TPA). After this first step, new multichromophoric systems have been designed, synthesised and investigated. The design stage was guided by previous obtained results and by theoretical predictions. Thus, the second stage of the project concerned new multichromophoric systems of desired supramolecular structure presenting stronger interchromophore interactions. Structures with constrained geometry but also flexible structures possibly mimicking real situations encountered in bulk systems for applications have been obtained. As expected, even more important supramolecular effects were observed on nonlinear optical properties (namely TPA). The developed theoretical model allowed to explain these effects as strongly dependent on contributions arising from interaction terms usually neglected in the description of interacting molecules. This first combined theoretical and experimental demonstration stresses the importance of correctly taking into account supramolecular interactions when designing and studying systems for applications, where environmental conditions play a major role and active units are in close proximity. These results clearly demonstrate the possibility of tuning the desired response by exploiting supramolecular interactions.
Data: CORDIS, © European Union
Project objective
The main objective of the proposed research is the definition of reliable supramolecular structure-properties relationships, with the aim to guide the design of materials with desired optical and electronic properties, from the molecular to the supramolecular level. Starting from the analysis of the properties of the solvated molecule, a comprehensive theoretical model will be developed to predict the properties of complex supramolecular systems, then guiding the synthetic strategy in a bottom-up approach from the molecule to the material. Small multichromophoric assemblies will be characterized by optical spectroscopie methods and new theoretical models will be developed to interpret the observed properties. Starting from these results, new multichromophoric systems will be synthesized, with the aim to obtain desired properties as predicted by the developed model. The study will then be extended to explore infinite two- and three-dimensional arrangements of interacting multichromophoric systems, with the aim to propose new architectures for knowledge-based materials with specific properties for advanced photonic or electronic applications. The aim of the project is an important one, since it would provide the basis for synthesizing structures with defined physical characteristics, i.e. knowledge-based materials. This will be obtained through a new synergy between condensed matter physics, supramolecular chemistry and optical spectroscopy.
Original text from CORDIS.
Participants
- CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE - DÉLÉGATION BRETAGNE PAYS DE LA LOIRE · RENNESCoordinatorCity levelFrance
Links
Data: CORDIS, © European Union