Morphological switching and constitutional dynamics
Morphological switching and constitutional dynamics.
Thèses de doctorat,
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The thesis concerns the relationship between molecular morphology and self-organization and puts the hypothesis that self-organization is determined by the morphology of the molecules from the medium. Metallo-controlled morphological switches, i.e. molecules being able to adopt different conformations depending on whether or not a metal ion is present, were designed and synthesized. Complexation/decomplexation processes then induce a morphological switching. The formation, from these tools, of dynamic systems was used to demonstrate that the constitution of a self-assembled system at thermodynamic equilibrium depends on the morphological state of these molecules. It thus demonstrated that molecular morphology determined the assemblies expressed by the system. The use of morphological switching processes makes it possible to reversibly switch a whole system between different constitutional states, polymers and macrocycles for instance, thus demonstrating an adaptive behavior of the system which reacts to morphological constraints. Functional systems were designed and it was demonstrated that the use of morphological switches allow to control the function expressed by the system. It thus showed the tremendous potential of this methodology of developing constitution-function relationships and demonstrated the need to be able to control the constitution of dynamic systems. This work demonstrates that molecular morphology is an information which can be used to control the constitution of functional dynamic systems. This reveals a mechanism through which matter can evolve and self-organize in order to express the species which fit best with the applied constraints.
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