Tuneable energy barriers in tetrairon(III) single-molecule magnets

Tuning Anisotropy Barriers in a Family of Tetrairon(III) Single-Molecule Magnets with anS= 5 Ground State

“…As previously reported, compound 1 has D 3 molecular symmetry, with the three binary axes directed along Fe1···Fe2, Fe1···Fe2‘ and Fe1···Fe2‘ ‘ (Figure a).…”

“…We have found that complex 5 can be converted into a new class of SMMs ( 1 − 4 ) by exchanging the bridging methoxides with tripodal ligands H 3 L = R−C(CH 2 OH) 3 (see Scheme ), as previously communicated . The reaction proceeds smoothly in organic solvents and allows modulating the molecular structure and magnetic parameters of the clusters by a proper choice of the R substituent.…”

“…In addition, isothermal magnetization data were collected in fields up to 60 kOe at low temperature. Magnetic data for compounds 1 and 3 ·Et 2 O have already been presented in ref . To check the slightly too high susceptibility value reported for 3 ·Et 2 O at low temperature,9b new accurate measurements were performed (see Supporting Information).…”

“…Magnetic data for compounds 1 and 3 ·Et 2 O have already been presented in ref . To check the slightly too high susceptibility value reported for 3 ·Et 2 O at low temperature,9b new accurate measurements were performed (see Supporting Information). Herein, we focus on compounds 2 and 4 , for which χ m T vs T and M m vs H curves are plotted in Figure .…”

Thermal Deposition of Intact Tetrairon(III) Single‐Molecule Magnets in High‐Vacuum Conditions

“…A signal centered at g = 2.00 observed in the film is attributed to the presence of an Fe 3+ impurity,31 probably the very volatile Fe(dpm) 3 complex 20. A further point to be noted is that the spectra of bulk samples show a splitting of the lines in the parallel region, a feature already reported for this cluster and attributed to the existence of two nonequivalent molecules with slightly different axial anisotropy 22, 32. The absence of this splitting in the spectra of evaporated samples suggests that a slight modification of the crystalline environment of the cluster occurs as a consequence of the deposition process, possibly resulting in a distribution of axial anisotropies for the deposited clusters.…”