Molecular Nanomagnets

The Dilemma of CrIIINiII Exchange Interactions: Ferromagnetism versus Antiferromagnetism

“…[7] In this case, molecular fragments cannot be described independently, and the whole system behaves as interconnected qubits (qubit = quantum bit) for quantum computing applications. [4] These molecules usually exhibit low total-spin values (preferably S = 1/2), and relatively long decoherence relaxation times (longer than those needed to manipulate spins), which allows their application for practical purposes. The molecules most widely studied for such applications are probably Cr 7 Ni rings.…”

“…The first is the synthesis of molecules with high magnetic anisotropic barriers due to high total-spin values (S) in combination with large and negative zero-field splitting parameters (D). [1][2][3][4] The purpose here is the achievement of units to build up nanoscopic storage information units. [5] The highenergy barrier should avoid the flip of the spin produced by the thermal jump over the barrier or due to tunneling effects, thus retaining the bit information (0 or 1) stored in the sign of the molecular spin (up or down).…”

Iron Lanthanide Phosphonate Clusters: {Fe6Ln6P6} Wells—Dawson-like Structures withD3dSymmetry

“…The magnetic properties of molecular transition-metal cages have received a great deal of attention since it was demonstrated that some examples display memory effects, the so-called single molecule magnets . This Study has led to research in related areas such as molecular spintronics, quantum information processing, and magnetocalorics. , We, and others, have been exploring the synthetic chemistry of 3d–4f cages to probe the effect of combining the very different magnetic properties of 3d and 4f ions in one molecule. , We have found that phosphonates, although usually requiring coligands to prevent formation of insoluble polymers, are particularly good ligands for binding such materials because the RPO 3 2– can bridge many metal ions, compared to carboxylates for example, with a favorable ligand set for the oxophilic lanthanides. , Moreover, their solubility and bulk can be readily tuned via choice of R, and it is also possible to introduce further functional groups…”

A molecular [Mn14] coordination cluster featuring two slowly relaxing nanomagnets

“…Molecular nanomagnets occupy a central position among molecular materials that will shape the future of nanotechnology. [1] These species are coordination clusters of paramagnetic (3d and/or 4f) metals, exhibiting a range of spin states as a result of intramolecular magnetic exchange. Some of them feature large spin ground states and Ising-type zero-field splitting (ZFS), which confer them the potential of retaining the orientation of their molecular magnetic moment along the direction of the easy anisotropy axis.…”