Abstract
The preparation and physical–chemical characterization of gold decorated hybrid materials based on individual magnetite nanoparticles coated with a poly(γ-benzyl-l-glutamate) shell is here presented. First, the synthesis of hybrid magnetite–polypeptide is achieved using a mimetic adhesive molecule, dopamine, which is responsible of both, anchoring the magnetite and initiating the ring-opening polymerization of γ-benzyl-l-glutamate N-carboxyanhydride. Besides, and in a second step, new molecules of dopamine are introduced to provide functionality to the poly(γ-benzyl-l-glutamate) by simple aminolysis reaction, which allow the growth and the stabilization of gold nanoparticles inside the polypeptide shell. Finally, the potential of these nanoparticles as a magnetic catalyst is proved by the reduction reaction of nitrophenol to aminophenol. The 100% efficiency with the magnetic recovery after eight catalytic cycles is also demonstrated.
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