Synthesis and magnetic properties of Mn12-based single molecular magnets with benzene and pentafluorobenzene carboxylate ligands

TL;DR

This study synthesizes Mn12-based single molecular magnets with different ligands and investigates how ligand structure influences their magnetic properties, revealing significant variations in magnetic behavior and underlying electronic interactions.

Contribution

It provides new insights into how ligand substitution affects the magnetic properties and electronic structure of Mn12-based SMMs, combining experimental synthesis with theoretical analysis.

Findings

Benzene ligand leads to unusual magnetic behavior with split magnetization curves below 10 K.

Pentafluorobenzene ligand shows typical blocking temperature at 3 K.

Theoretical calculations confirm ligand-dependent electronic and magnetic interactions.

Abstract

We report on the synthesis and magnetic properties of Mn12-based single molecular magnets (SMMs) with benzene and pentafluorobenzene carboxylate ligands. The changes in ligand structure are shown to have a decisive effect on magnetic properties of produced complexes. The compound with benzene demonstrates unusual magnetic behaviour, namely, temperature dependencies of magnetization taken under the zero field cooled and field cooled conditions are split below 10 K and furthermore remnant magnetization and coercive force remain nonzero in this temperature range. In contrast, compound with pentafluorobenzene displays the customary signatures of a blocking temperature at 3K. The effect of ligand substitution was theoretically studied within local density approximation taking into account on-site Coloumb repulsion. Calculation results confirm that the electronic structure and the magnetic exchange interactions between different Mn atoms strongly depend on the type of ligands.