This research reveals slow magnetic relaxation properties in coordination polymers with Kramers ions, suggesting new insights into their structural characteristics.
A heteroditopic ligand (H2L1) containing picolinate and benzoate moieties segmented by a triple bond has been used in the preparation of a family of isostructural coordination polymers of the formula [(CH3)2NH2][Ln((H2O)2L1)2] (Ln = Eu (1), Gd (2), Tb (3), Dy (4), Ho (5) and Er (6)). The single crystal structures show that these compounds crystallize in the monoclinic I2/a space group and form anionic layers with rhomboidal voids. AC magnetic susceptibility measurements show that compounds based on Kramers ions, such as the Gd (2), Dy (4) and Er (6) derivatives, present slow relaxation of magnetization (SRM) under an applied DC magnetic field. On the other hand, Tb (3) and Ho (5) compounds, based on non-Kramers ions, lack SRM properties. Compound 2 is one of the few reported Gd(III) compounds showing slow relaxation behaviour.
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Jornet‐Mollá et al. (2025) studied this question.
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