¹⁶¹Dy Time‐Domain Synchrotron Mössbauer Spectroscopy for Investigating Single‐Molecule Magnets Incorporating Dy Ions

Abstract

Time-domain synchrotron Mössbauer spectroscopy (SMS) based on the Mössbauer effect of ¹⁶¹ Dy has been used to investigate the magnetic properties of a Dy^III -based single-molecule magnet (SMM). The magnetic hyperfine field of [Dy(Cy₃ PO)₂ (H₂ O)₅ ]Br₃ ⋅2 (Cy₃ PO)⋅2 H₂ O⋅2 EtOH is with B₀ =582.3(5) T significantly larger than that of the free-ion Dy^III with a ⁶ H_15/2 ground state. This difference is attributed to the influence of the coordinating ligands on the Fermi contact interaction between the s and 4f electrons of the Dy^III ion. This study demonstrates that ¹⁶¹ Dy SMS is an effective local probe of the influence of the coordinating ligands on the magnetic structure of Dy-containing compounds.