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

Abstract

A tetrairon(III) single-molecule magnet is deposited using a thermal evaporation technique in high vacuum. The chemical integrity is demonstrated by time-of-flight secondary ion mass spectrometry on a film deposited on Al foil, while superconducting quantum interference device magnetometry and alternating current susceptometry of a film deposited on a kapton substrate show magnetic properties identical to the pristine powder. High-frequency electron paramagnetic resonance spectra confirm the characteristic behavior for a system with S = 5 and a large Ising-type magnetic anisotropy. All these results indicate that the molecules are not damaged during the deposition procedure keeping intact the single-molecule magnet behavior.

Diamondoid Structure in a Metal–Organic Framework of Fe4 Single‐Molecule Magnets

“…To obtain independent information on magnetic anisotropy, we also recorded W‐band EPR spectra on microcrystalline powder of 2 at 40 K (Figure ). The spectrum shows the typical features observed in several Fe 4 compounds measured at this frequency . Of particular relevance for the determination of the axial zfs parameter D is the low‐field transition, assigned to the M S =−4→ M S =−3 resonance .…”

X‐Ray Detected Magnetic Hysteresis of Thermally Evaporated Terbium Double‐Decker Oriented Films

“…Successful attempts to deposit SMMs in UHV conditions have been carried out with a tetranuclear iron(III) cluster [ 9 ] and lanthanide bis-phthalocyaninato (LnPc 2 ) complexes. [ 10 , 11 ] For the latter the seminal works of Ishikawa et al [ 12 ] showed that slow dynamics of the magnetization in these mononuclear complexes is originated directly from their strong single ion anisotropy.…”

Valence electronic structure of sublimated Fe4single-molecule magnets: an experimental and theoretical characterization

“…1). Within the Fe 4 family, these two clusters are the only ones that have been successfully sublimated in ultra-high vacuum (UHV) conditions, 13,15 preserving unaltered their magnetic properties. The three external Fe III complete their coordination sphere by binding with two b-diketonates (dpm À or pta À ).…”