Soluble Ligand-Stabilized Cyano-Bridged Coordination Polymer Nanoparticles

Size controlled organic phase soluble cyano-bridged bimetallic coordination polymer nanoparticles made of M n + and [M′(CN) 6 ] 3− (with M n + = Mn 2+, Ni 2+, Fe 2+, Eu 3+, Tb 3+, Sm 3+ and M′ = Fe 3+, Cr 3+ ) were synthesized by using oleic acid and trialkylamines or a triarylamine as stabilizing agents. The obtained nanoparticles were studied by transmission electronic microscopy (TEM), infrared and electronic spectroscopy, X-ray diffraction, and magnetic measurements. These analyses revealed the formation of spherical metallic cyano-bridged nanoparticles with sizes in the range of 2–5 nm depending on the nature of the metal ion used. The magnetic studies of these colloidal solutions revealed the presence of a pure superparamagnetic regime for the nanoparticles based on [Cr(CN) 6 ] 3− and a collective regime caused by weak dipolar interparticle interactions for the nanoparticles based on [Fe(CN) 6 ] 3− .