Over the past 25 years, the photo-induced spin-crossover behaviour of Fe(II) complexes has puzzled scientists. Now, a symmetry-breaking twisting mode has been observed during the relaxation of such a complex. Controlling its configuration using enantiopure counterions has also been shown to slow down the relaxation.
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Johansson, J.O. Plot twist in the iron spin saga. Nat. Chem. 14, 722–723 (2022). https://doi.org/10.1038/s41557-022-00986-1
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DOI: https://doi.org/10.1038/s41557-022-00986-1