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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
Published on: July 3, 2015
Co(3)[Co(CN)(5)](2): a microporous magnet with an ordering temperature of 38 K
Laurance G Beauvais1, Jeffrey R Long
1Department of Chemistry, University of California, Berkeley, California 94720-1460, USA.
Abstract:
The reaction between [Co(H2O)6]2+ and [Co(CN)5]3- in deoxygenated water yields a dark blue solid of composition Co3[Co(CN)5]2.8H2O (1). X-ray powder diffraction data indicate a cubic Prussian blue-type framework, wherein the hexacyanometalate positions have only a two-thirds occupancy of square-pyramidal [Co(CN)5]3- units. Upon dehydration, the compound retains crystallinity and exhibits a Type I dinitrogen sorption isotherm, characteristic of a microporous solid. Magnetic measurements show 1 to behave as a ferrimagnet with an ordering temperature of 48 K, which is reduced to 38 K in the dehydrated solid. At 5 K, both 1 and dehydrated 1 exhibit magnetic hysteresis with a coercive field of 1160 G (the highest value yet reported for a cubic Prussian blue analogue) and remnant magnetizations of 1540 and 745 cm3G/mol, respectively. Thus, dehydrated 1 represents the first compound for which microporosity and long-range magnetic ordering have been demonstrated to coexist.
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