Abstract
Iron (III) complexes of [FeL]BPh4·acetone containing the hexadentate ligand derived from triethylenetetramine and salicylaldehyde have been synthesized. These complexes were grown in two crystalline forms; monoclinic and twin crystals. The spin-state interconversion rate of the monoclinic form is as fast as the inverse of the Mössbauer lifetime (1×10−7 s) above 200 K. The crystal structure of the monoclinic form (complex a) was determined at 290 K and to be of space group P21/a, with a=27.418 (4), b=10.097 (2), c=14.726 (3) Å, β=98.00 (1)°, and Z=4. The average bond distances of Fe−O (1.875 Å), Fe−Nimine (1.988 Å) and Fe−Namine (2.069 Å) are in good agreement with the expected values for the transition spin-state between high- and low-spin states. Twin crystals are in a high-spin state over the temperature range 78–320 K.
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Maeda, Y., Oshio, H., Tanigawa, Y. et al. Mössbauer spectra and molecular structure of spin-crossover iron (III) complexes of monoclinic form with hexadentate ligands derived form triethylenetetramine and salicylaldehyde [Fe(sal2trien)]BPh4·acetone. Hyperfine Interact 68, 157–160 (1992). https://doi.org/10.1007/BF02396460
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DOI: https://doi.org/10.1007/BF02396460