Spectroscopy of Single-Molecule Magnets

EPR spectroscopy of thermally induced and light-induced spin transitions in heterospin exchange clusters of compounds Cu(hfac)2LR

“…1- 23 In addition to the static magnetic susceptibility technique and X ray diffraction analysis, in many cases EPR spectroscopy be comes a key method of investigations of the structural and magnetic properties of such exchange coupled systems. [24][25][26][27][28][29][30][31] This review is devoted to a new class of molecular magnet ics, viz., "breathing crystals" and summarizes for the first time the results of systematic EPR investigations of ther mally induced and light induced spin transitions in these compounds. 32-38 R = Me, Et, Pr n , Bu n The family of heterospin "breathing crystals" Cu(hfac) 2 L R based on copper(II) hexafluoroacetylacetonate and pyr azolyl substituted nitronyl nitroxides was discovered quite recently.…”

The Effect of Crystal Packing and ReIV Ions on the Magnetisation Relaxation of [Mn6]‐Based Molecular Magnets

“…In the multidisciplinary field of molecule-based magnetism, the structural and magnetic properties of molecular magnets have been thoroughly investigated for their fundamentally interesting chemistry and physics that can potentially provide a gateway for the discovery of new physical phenomena and application in a diverse array of technological applications. [1][2][3][4][5][6][7][8][9] These can include quantum information processing, [10][11][12] cryogenic refrigeration [13,14] and molecular spintronics. [15] In molecules of the 3d transition metal ions, slow relaxation of the magnetisation in single-molecule magnets (SMMs)-as evidenced through temperature and sweep rate dependent hysteresis loops in magnetisation versus field studies-originates from a large-spin ground state (S) and a significant negative axial zero-field splitting (zfs) of that ground state (D), with the upper limit of the energy barrier (U) for the reorientation of the magnetisation vector given by S 2 j D j or (S 2 À1/4) j D j for integer and half-integer S values, respectively.…”

Accurate and unequivocal determination of the crystal-field parameters of lanthanide ions via a multitechnique approach

“…Spectroscopy allows direct observation of the magnetic level splittings [45][46][47][48][49], but the determination of the magnetic state mixing via spectroscopic means remains very challenging. This level of information is presently obtainable only by using large scale facilities, e.g., via neutron scattering techniques [23,50].…”