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Fe{HB(C 2 H 2 N 3 ) 3 } 2 is observed by variable temperature infrared and magnetic studies to have a spin transition between the low spin S=0 and high spin S=2 states at 331K (58°C) with thermal hysteresis of ∼1.5K. Changes in the triazole ligand IR absorptions demonstrate that distant non-metal–ligand vibrations are altered upon the change in electronic structure...
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