Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 12, Issue 14, Pages 3798-3804Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200500805
Keywords
cyanides; ionic liquids; magnetic properties; materials science; nanostructures
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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][BF4] (M2+ = Ni, Cu, CO) and Fe-4[Fe(CN)(6)](3)/[RMIM] [BF4] (R = 1-butyl (BMIM), 1-decyl (DMIM)), were prepared in the corresponding 1-R-3methylimidazolium tetrafluoroborate [RMIM][BF4], 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.
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