What question did this study set out to answer?

This research aims to understand the effect of ligand substitution on the magnetic properties of Co(II) octahedral complexes.

April 10, 2026Open Access

Impact of O/S Substitution on Ligand Field and Single-Ion Magnetic Properties of Co(II) N3−-Containing Octahedral Complexes

Key Points

This research aims to understand the effect of ligand substitution on the magnetic properties of Co(II) octahedral complexes.
Synthesis of two Co(II) complexes using different ligand substituents (MOP and MSP).
Characterization of complexes through analysis of ligand field effects and geometries.
Ab initio calculations to assess magnetic relaxation processes.
Different ligand fields lead to distinct Jahn–Teller effects in the complexes.
Co(II) ions display sensitivity to the ligand environment, affecting magnetic properties.
The substitution from O to S in ligands alters the Co(II)-N bond lengths, influencing relaxation behaviors.

Abstract

Electronics evolution drives SMMs as a frontier, overcoming conventional magnetic material limits via molecular spin coupling. Two relevant Co(II) mononuclear complexes, Co(MOP)4(N3)2 (1) and Co(MSP)4(N3)2 (2) (MOP = 4-methoxypridine and MSP = 4-methylthiopyridine) were synthesized through changing the substituents of ligands. The Co(II) ions in the two complexes show octahedron coordination geometries. The replacement of the O to S in the equatorial plane leads to different Jahn–Teller effect because of the shorter Co(II)-N in the equatorial plane, resulting in the significantly different slow relaxation process confirmed by ab initio calculation. The results confirm the Co(II) ion is sensitive to ligand field.

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Cite This Study

Wu et al. (Tue,) studied this question.

synapsesocial.com/papers/69d893626c1944d70ce045cf https://doi.org/https://doi.org/10.3390/magnetochemistry12040045

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