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Synthesis of Cyano‐Bridged Magnetic Nanoparticles Using Room‐Temperature Ionic Liquids
Author(s) -
Clavel Guylhaine,
Larionova Joulia,
Guari Yannick,
Guérin Christian
Publication year - 2006
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200500805
Subject(s) - ionic liquid , nanoparticle , materials science , chemical engineering , magnetic nanoparticles , ionic bonding , nanotechnology , chemistry , ion , organic chemistry , catalysis , engineering
A principally new exploit of ionic liquids as an alternative reaction medium in the synthesis of cyano‐bridged coordination‐polymer nanoparticles is reported. Stable colloid solutions containing nanoparticles of cyano‐bridged molecule‐based magnets, M 3 [Fe(CN) 6 ] 2 /[RMIM][BF 4 ] (M 2+ =Ni, Cu, Co) and Fe 4 [Fe(CN) 6 ] 3 /[RMIM][BF 4 ] (R=1‐butyl (BMIM), 1‐decyl (DMIM)), were prepared in the corresponding 1‐R‐3‐methylimidazolium tetrafluoroborate [RMIM][BF 4 ], which acts as both a stabilising agent and a solvent. By varying the length of the N‐alkyl chain on the imidazolium cation of [RMIM] + and the temperature, the growing process can be controlled to produce nanoparticles of different sizes. By studying the magnetic properties of frozen colloids it is shown that the relaxation of magnetisation is strongly influenced by interparticle interactions, which leads to the appearance of spin‐glass‐like dynamics in these systems.