1 research outputs found
Large Orbital Magnetic Moment Measured in the [TpFe<sup>III</sup>(CN)<sub>3</sub>]<sup>ā</sup> Precursor of Photomagnetic Molecular Prussian Blue Analogues
Photomagnetism in
three-dimensional Co/Fe Prussian blue analogues is a complex phenomenon,
whose detailed mechanism is not yet fully understood. Recently, researchers
have been able to prepare molecular fragments of these networks using
a building block synthetic approach from mononuclear precursors. The
main objective in this strategy is to isolate the smallest units that
show an intramolecular electron transfer to have a better understanding
of the electronic processes. A prior requirement to the development
of this kind of system is to understand to what extent electronic
and magnetic properties are inherited from the corresponding precursors.
In this work, we investigate the electronic and magnetic properties
of the <b>FeTp</b> precursor (NĀ(C<sub>4</sub>H<sub>9</sub>)<sub>4</sub>)Ā[TpFe<sup>III</sup>(CN)<sub>3</sub>], (Tp being tris-pyrazolyl
borate) of a recently reported binuclear cyanido-bridged Fe/Co complex.
X-ray absorption spectroscopy and X-ray magnetic circular dichroism
measurements at the Fe <i>L</i><sub>2,3</sub> edges (2p
ā 3d) supported by ligand field multiplet calculations have
allowed to determine the spin and orbit magnetic moments. Inaccuracy
of the spin sum rule in the case of low-spin Fe<sup>III</sup> ion
was demonstrated. An exceptionally large value of the orbital magnetic
moment is found (0.9 Ī¼<sub>B</sub> at <i>T</i> = 2
K and <i>B</i> = 6.5 T) that is likely to play an important
role in the magnetic and photomagnetic properties of molecular Fe/Co
Prussian blue analogues