Regensburg 2019 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Focus: Mechanoresponsive Molecules and Materials - organized by Kerstin Blank and Robert Göstl

CPP 24.1: Invited Talk

Tuesday, April 2, 2019, 10:45–11:15, H14

Mechanochemical activation of Cu-NHC-complexes : molecular design, force-measurements and application in polymer materials — •Wolfang H Binder¹, Michel Biewend¹, Philipp Michael¹, Martin Beyer², and Matthew Sammon² — ¹Martin-Luther University Halle-Wittenberg, Institute of Chemistry, Chair of Macromolecular Chemistry — ²Leopold-Franzens-Universität Innsbruck, Institut für Ionenphysik und Angewandte Physik

Understanding rupture of single chemical bonds is an important aspect in chemistry, physics and biology, as many bonds form and reform reversibly, imparting dynamic properties into a molecule or the material it is embedded into (eg. DNA-replication, protein-assembly). However, rupture of covalent bonds can also be induced by molecular force when acting on a chemical bond, enabling bond breaking by distortion. We here report on a metal-complex designed to be activated by molecular force, transmitted via bound polymer chains acting as molecular handles. We will discuss the chemical nature of the metal-complex acting as a mechanophoric system, followed by considerations to measure the molecular force by AFM. Designed cyclic mechanophores enable to discriminate true disruptive events from purely thermal induced debonding events. The use of molecular networks to efficiently transmit force onto the labile mechanochemical bonds will be discussed in view of force-detection in polymeric materials. References: Chem. Soc. Rev. 2011, 40, 2359; MRC, 2018, 0, 1800376; Angew. Chem., Int. Ed. 2015, 54, 13918; Angew. Chem. Int. Ed. 2015, 54, 2556.