Controlled ON/OFF stereocomplexation of dynamic helical polymer-metal nanoparticle nanocompositespoly-(phenylacetylene)-MNP nanocomposites (M = Au or Ag)is presented. These novel hybrid materials can be found either as well-dispersed metal nanoparticles (MNPs) (stereocomplex OFF) or as fiber-like aggregates (stereocomplex ON) with the metal nanoparticles distributed along the material. A stereocomplex-MNP nanocomposite is formed by the interaction of two complementary and enantiomeric helical polymer-MNP nanocomposites Poly-(R)-1-M1NPs/poly-(S)-1-M2NPs (M1 = M2 or M1 ≠ M2; M = Au, Ag). Interestingly, by using dynamic helical polymers, i.e., poly-(phenylacetylene)-s (PPAs), as coating agents of the metal nanoparticles, it is possible to tune the secondary structure of the polymerelongation and/or compressiona fact that can trigger the formation/disruption of the stereocomplex. Moreover, the stereocomplexation of these nanocomposites can be controlled in a reversible way (ON/OFF) by playing with the supramolecular interactions that keep the two enantiomeric and complementary helices together, such as hydrogen bonds.
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