Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 2, Pages 282-288Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.200900937
Keywords
Spin crossover; Photomagnetism; Nanoparticles; Coordination polymers; Magnetic properties
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We investigate here the consequence on light-induced and thermally induced spin-crossover (SCO) properties with particle size reduction from the macroscopic to microscale to nanoscale domains. Three samples with distinct particle sizes of the SCO coordination polymer [Fe(NCS)(2)(bpe)(2)] [bpe = 1,2-bis(4'-pyridyl) ethane I have been prepared by water-in-oil reverse micelle methods. Comparison of the magnetic properties with particle size reduction of these and the original macroscale slow-grown crystals revealed that the spin transition becomes more gradual, more incomplete and concomitantly the transition temperature (T-1/2) decreases - much like what is observed in metal dilution studies. Importantly, here, in the first photoinduced magnetic studies on a nanoparticle SCO system, we see that even on the nanoscale photoconversion of the low spin species to a metastable high-spin state is possible. Furthermore, particle size reduction appears to have little effect on the temperature at which the stored photomagnetic information is erased. These results highlight that light-induced SCO properties are governed by direct metal coordination environment (i.e., on the molecular scale), whereas, thermally induced magnetic properties rely more on crystal packing and ligand field effects.
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