Abstract
This review summarizes the structural characteristics and magnetic properties of trinuclear complexes containing the NiII-LnIII-NiII moiety and also oligonuclear complexes and coordination polymers containing the same trinuclear moiety. The ligands used are mainly polydentate Schiff base ligands and reduced Schiff base ligands and, in some cases, oximato, β-diketonato, pyridyl ketone ligands and others. The compounds reported are restricted to those containing one, two and three oxygen atoms as bridges between the metal ions; examples of carboxylato and oximato bridging are also included due to structural similarity. The magnetic properties of the complexes range from ferro- to antiferromagnetic depending on the nature of the lanthanide ion.
Highlights
The field of Molecular Magnetism emerged as an interdisciplinary field of research between chemists willing to understand the experimental techniques and theoretical tools needed to explain the magnetic properties of coordination compounds and physicists willing to comprehend the molecular structures and intra/intermolecular interactions responsible for the magnetic properties of the above solids
Coordination compounds of various nuclearities and dimensionalities have been the experimental objects for magnetic properties studies and classes of materials with specific properties have been reported, for example Single-Molecule Magnets (SMMs), Single-Ion Magnets (SIMs) and Single-Chain Magnets (SCMs)
SMMs can be considered as single molecules behaving like the ‘magnetic domains’ of bulk magnets and each molecule can be magnetized and retaining its magnetization upon removal of the external magnetic field
Summary
The field of Molecular Magnetism emerged as an interdisciplinary field of research between chemists willing to understand the experimental techniques and theoretical tools needed to explain the magnetic properties of coordination compounds and physicists willing to comprehend the molecular structures and intra/intermolecular interactions responsible for the magnetic properties of the above solids. The f electrons do not contribute to bonding upon coordination and the interactions between the f electrons and ligand orbitals are very weak and only strong electronegative atoms are able to bind to a lanthanide ion Another important aspect is that all the 4f ions are able to form complexes without substantial geometrical differences in the geometrical environment, which is extremely helpful in molecular magnetism in order to study complexes of different electronic structures albeit of similar geometrical characteristics. The present review emphasizes on the reported trinuclear Ni-Ln-Ni complexes, oligonuclear complexes and coordination polymers containing the Ni-Ln-Ni moiety, their structural characteristics and magnetic behavior which ranges from ferro-to antiferromagnetic depending on the nature of the lanthanide ion. The ligands used are mainly Schiff bases based on salicylaldehyde, o-vanillin and tripodal, dipodal aliphatic and aromatic amines; few examples are reported with diketonato or other type of ligands
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