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Université de Fribourg

Preparation of metallosupramolecular single-chain polymeric nanoparticles and their characterization by Taylor dispersion

Neumann, Laura N. ; Urban, Dominic A. ; Lemal, Philipp ; Ramani, Sushila ; Petri-Fink, Alke ; Balog, Sandor ; Weder, Christoph ; Schrettl, Stephen

In: Polymer Chemistry, 2020, vol. 11, no. 2, p. 586–592

Intramolecular cross-linking of polymers can furnish single-chain polymeric nanoparticles (SCPNs), and the use of reversible non-covalent bonds for cross-linking can potentially provide such nanoparticles with stimuli-responsive properties. Here, we report the synthesis of acrylic polymers that carry pendant 2,6-bis(1′-methyl- benzimidazolyl)pyridine ligands, and use these for the...

Université de Fribourg

Triggered metal ion release and oxidation: ferrocene as a mechanophore in polymers

Giannantonio, Michela Di ; Ayer, Mathieu A. ; Verde-Sesto, Ester ; Lattuada, Marco ; Weder, Christoph ; Fromm, Katharina M.

In: Angewandte Chemie International Edition, 2018, vol. 57, no. 35, p. 11445-11450

The introduction of mechanophores into polymers makes it possible to transduce mechanical forces into chemical reactions that can be used to impart functions such as self‐healing, catalytic activity, and mechanochromic response. Here, an example of mechanically induced metal ion release from a polymer is reported. Ferrocene (Fc) was incorporated as an iron ion releasing mechanophore into...

Université de Fribourg

Approaches to Polymeric Mechanochromic Materials

Calvino, Céline ; Neumann, Laura ; Weder, Christoph ; Schrettl, Stephen

In: Journal of Polymer Science, Part A: Polymer Chemistry, 2017, p. 640-652

Université de Fribourg

Light-Activated Healing of Metallosupramolecular Polymers

Fiore, Gina L. ; Rowan, Stuart J. ; Weder, Christoph

In: CHIMIA International Journal for Chemistry, 2011, vol. 65, no. 9, p. 745

Université de Fribourg

Mechanoresponsive Luminescent Molecular Assemblies : An Emerging Class of Materials

Sagara, Yoshimitsu ; Yamane, Shogo ; Mitani, Masato ; Weder, Christoph ; Kato, Takashi

In: Advanced Materials, 2015, vol. 28, no. 6, p. 1073-1095

The possibility to change the molecular assembled structures of organic and organometallic materials through mechanical stimulation is emerging as a general and powerful concept for the design of functional materials. In particular, the photophysical properties such as photoluminescence color, quantum yield, and emission lifetime of organic and organometallic fluorophores can significantly...

Université de Fribourg

Mechanochemistry in polymers with supramolecular mechanophores

Haehnel, Alexander P. ; Sagara, Yoshimitsu ; Simon, Yoan C. ; Weder, Christoph

In: Topics in current chemistry, 2015, vol. 369, p. 345-375

Mechanochemistry is a burgeoning field of materials science. Inspired by nature, many scientists have looked at different ways to introduce weak bonds into polymeric materials to impart them with function and in particular mechano-responsiveness. In the following sections, the incorporation of some of the weakest bonds, i.e. non- covalent bonds, into polymeric solids is being surveyed. This...

Université de Fribourg

Mechanochemistry with Metallosupramolecular Polymers

Balkenende, Diederik W. R. ; Coulibaly, Souleymane ; Balog, Sandor ; Simon, Yoan C. ; Fiore, Gina L. ; Weder, Christoph

In: Journal of the American Chemical Society, 2014, vol. 136, no. 29, p. 10493-10498

The transduction of mechanical force into useful chemical reactions is an emerging design approach to impart soft materials with new functions. Here, we report that mechanochemical transductions can be achieved in metallo-supramolecular polymers. We show that both reversible and irreversible reactions are possible and useful to create me-chanically responsive materials that display new...