Publication in Inorganic Chemistry Communications
Exchange-versus anisotropy-driven magnetism in phenoxido-bridged Ni(II) and Co(II) dimers
Authors: Martin Mlecka, Iaroslav Doroshenko, Lucie Simonikova, Zdenek Moravec, Jaromír Marek, Ján Vančo, Zdeněk Trávníček, and Jiri Pinkas
Full-text: https://doi.org/10.1016/j.inoche.2026.117050
Two phenoxido-bridged dinuclear Ni(II) and Co(II) complexes, [M2(SAIDPPO)2(NO3)2] (M = Ni, Co), have been synthesized using a new Schiff base phosphine oxide ligand (SAIDPPO-). Single-crystal X-ray diffraction revealed closely related Ni2O2 and Co2O2 cores with distinct magnetostructural features. Magnetic studies showed that the Ni(II) complex (1) exhibits ferromagnetic coupling (J = +9.75 cm-1) associated with a near-orthogonal Ni–O–Ni angle (95.50◦) and pronounced easy-axis anisotropy (D = -19.44 cm-1). In contrast, the Co(II) analog (2) displays weak antiferromagnetic coupling (J ≈ -4.32 cm-1) combined with significant easy-axis anisotropy (D = -28.45 cm-1) arising from strong spin-orbit coupling. The comparison of the Ni2O2 and Co2O2 cores highlights iations, particularly the M–O–M angle, govern the balance between exchange interactions and magnetic anisotropy.
Exchange-versus anisotropy-driven magnetism in phenoxido-bridged Ni(II) and Co(II) dimers