A tripodal ligand containing three imidazole groups inducing spin crossover in both Fe(II) and Fe(III) complexes; structures and spin crossover behaviors of the complexes
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A tripodal hexadentate ligand containing three imidazole groups gives spin-crossover iron complexes in both the +II and the +III oxidation states. The tetrafluoroborate salt of the Fe(II) complex shows a gradual spin transition in the temperature range 110-270 K. The corresponding Fe(III) complex shows a spin transition above 150 K, and at 300 K ca. 87% of the Fe(III) ion is in the high-spin state.
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