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Keywords:

  • Chromium;
  • Cyanide;
  • Nanoparticles, magnetic;
  • Nickel;
  • Superparamagnetism

Using reverse micelles as nanoreactors facilitates the preparation of bimetallic CrIII–NiII cyanide-bridged nanoparticles that behave as superparamagnets with a blocking temperature of 5.5 K. The Figure presents a plot of magnetization vs. field for various temperatures. Redispersion in an organic solution allows the particles to be diluted in a polymer matrix (inset of Figure) leading to a shift of the blocking temperature down to 2 K.