Solvent-induced high-spin transition in double-decker 3 d -4 f metallacrowns
Abstract
Element-specific magnetic spin and orbital magnetic moments of 3 d -4 f double-decker metallacrown molecules have been investigated using x-ray magnetic circular dichroism. The double-decker metallacrowns comprise one rare-earth Gd(III) or Tb(III) ion embedded between two squared scaffolds of four Ni(II) ions. We observe a strong increase of the Ni(II) moments if the molecules are dissolved in methanol, indicating a spin crossover from a low-spin to a high-spin state. In contrast, dichloromethane does not change the spin state. This result is explained by a change of the coordination environment of nickel. The comparison of charge-transfer multiplet calculations with the experimental absorption spectra confirm the different ligand fields.
- Publication:
-
Physical Review B
- Pub Date:
- March 2019
- DOI:
- 10.1103/PhysRevB.99.104404
- Bibcode:
- 2019PhRvB..99j4404A