Mesophase Transformation in Amphiphilic Hyperbranched Polymers Induced by Transition Metal Ion Complexation. Creating Well-Defined Metallo-Supramolecular Assemblies from "Ill-Defined" Building Blocks

Austín S. Picco, Wolfgang Knoll, Marcelo Ceolín, Omar Azzaroni

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Self-organized metallo-supramolecular hetero- structures have potential applications that include molecular electronics, photovoltaics, and magnetic devices, among other examples. The main challenge that scientists typically face when designing advanced supramolecular materials is to achieve structurally de fi ned assemblies by resolving con fl icting demands on the topological and/or chemical features of the constituting building blocks. Accordingly, the formation of well-de fi ned metallo-supramolecular arrays using ill-de fi ned, highly polydisperse, self-assemblable starting compounds marks a profound departure from traditional supramolecular paradigms. The present work describes the fi rst observation of spontaneous mesophase transformation of well-de fi ned metallo-supramolecular assemblies in solution as a result of the complexation of transition metal ions into the ionophilic domains of highly branched unimolecular micelles constituted of N -acylated hyperbranched polyethylenimine. Experimental results based on a combination of di ff erent synchrotron-based techniques provide unprecedented experimental evidence revealing that ion-induced self-assembly of amphiphilic hyperbranched polymers can be used to achieve highly ordered metallo-supramolecular structures not only in solution but also on solid surfaces. We believe that this emerging conceptual framework can open extremely interesting new synthetic and technological opportunities in the area of self-assembly of well-de fi ned metallo-supramolecular architectures obtained from building blocks with poor structural regularity but easily provided in large quantities by simple and inexpensive preparative chemistries
    Original languageEnglish
    Pages (from-to)94-100
    Number of pages7
    JournalAmerican Chemical Society
    DOIs
    Publication statusPublished - 2014

    Research Field

    • Biosensor Technologies

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