Structural, Electronic, and Magnetic Properties of Fe[HC(3,5-Me₂pz)₃]₂(BF₄)₂ (pz = Pyrazolyl): Observation of Unusual Spin-crossover Behavior
The complex Fe[HC(3,5-Me2pz)3]2(BF4)2, shown crystallographically to contain a unique octahedral N6Fe site, shows a new type of spin-crossover behavior. The solid is high-spin from 350 K down to a temperature of 206 K, but below 206 K it undergoes a very abrupt decrease in magnetic moment. Mossbauer studies show conclusively that the magnetic moment change observed at 206-200 K arises from the complex changing over a very small temperature range from a high-spin state at higher temperatures to a mixture of high-spin and low-spin at lower temperatures, a mixture that does not change composition as the temperature is lowered to 5 K.
D. L. Reger et al., "Structural, Electronic, and Magnetic Properties of Fe[HC(3,5-Me₂pz)₃]₂(BF₄)₂ (pz = Pyrazolyl): Observation of Unusual Spin-crossover Behavior," Inorganic Chemistry, American Chemical Society (ACS), Jan 2000.
The definitive version is available at https://doi.org/10.1021/ic000721z
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