Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 8, Pages 3912-3917Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202012216
Keywords
chain growth polymerization; conjugated polymers; gold nanoparticles; hybrid materials; N-heteroyclic carbenes
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Funding
- Leibniz-Institut fur Polymerforschung, Dresden (IPF)
- Fonds der Chemischen Industrie (FCI)
- Deutsche Forschungsgemeinschaft (DFG German Research Foundation) [407193529]
- Projekt DEAL
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By using N-heterocyclic carbenes (NHCs) as anchor groups, organic ligands can be bound to colloidal gold, resulting in the successful preparation of P3HTs-NHC-Au with narrow molecular weight distributions. These gold nanoparticles exhibit excellent thermal and redox stability.
Recently, N-heterocyclic carbenes (NHCs) are explored as anchor groups to bind organic ligands to colloidal gold (i.e. gold nanoparticles, Au NPs), yet these efforts are confined to non-conjugated ligands so far-that is, focused solely on exploiting the stability aspect. Using NHCs to link Au NPs and electronically active organic components, for example, conjugated polymers (CPs), will allow capitalizing on both the stability as well as the inherent conductivity of the NHC anchors. Here, we report three types of Br-NHC-Au-X (X=Cl, Br) complexes, which, when used as starting points for Kumada polymerizations, yield regioregular poly(3-hexylthiophenes)-NHC-Au (P3HTs-NHC-Au) with narrow molecular weight distributions. The corresponding NPs are obtained via direct reduction and show excellent thermal as well as redox stability. The NHC anchors enable electron delocalization over the gold/CP interface, resulting in an improved electrochromic response behavior in comparison with P3HT-NHC-Au.
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