Slow quantum relaxation in a tetrairon(III) single-molecule magnet

Cornia, Andrea; Gregoli, Luisa; Danieli, Chiara; Caneschi, Andréa; Sessoli, Roberta; Sorace, Lorenzo; Barra, Anne‐Laure; Wernsdorfer, Wolfgang

doi:10.1016/j.ica.2008.02.067

Cited by 25 publications

(23 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With rare exceptions, heteroleptic tetrairon(III) species contain ligands with separate structural roles. Chelating β‐diketonates, or simpler monodentate ligands (halides, alcohols) bind exclusively to peripheral ions, while monodentate alkanoates, , or triply deprotonated trimethylol derivatives H 3 L R = R‐C(CH 2 OH) 3 (Scheme ), act solely as bridging ligands. The possibility to independently vary terminal and bridging ligands adds considerable chemical versatility to this particular subclass.…”

Section: Chemistry Of Fe4 and Related Complexesmentioning

confidence: 99%

“…The solid curves provide the best fit to experimental data. Panel (b) adapted from ref., Copyright (2008), with permission from Elsevier.…”

Section: Electronic Structure and Magnetic Behavior Of Fe4 And Relatementioning

confidence: 99%

“…(b) Temperature‐dependent spin relaxation time in compound 3 CH2OPh , measured by AC susceptometry on a powder sample (empty circles) and by microSQUID magnetometry on a single crystal (solid circles); the orange straight line provides the best fit to high‐ T data with Arrhenius law. Panel (b) adapted from ref . Copyright (2008), with permission from Elsevier.…”

Section: Electronic Structure and Magnetic Behavior Of Fe4 And Relatementioning

confidence: 99%

“…One of the earliest experimental evidences of thermal plus tunneling relaxation in a Fe 4 complex was reported for R = CH 2 OPh by combining AC susceptometry on powder samples with microSQUID magnetometry on single crystals . High‐frequency electron paramagnetic resonance (HF‐EPR) spectra indicated D = –0.433(2) cm –1 in this particular complex, for which Equation (6) predicts an energy barrier U/k B = 15.57(7) K. The plot of zero‐field relaxation time ( τ ) vs. reciprocal temperature is linear between 3 and 1.7 K (Figure b) and provides an energy barrier U eff / k B = 15.7(2) K in Arrhenius law τ = τ 0 exp( U eff / k B T ).…”

Section: Electronic Structure and Magnetic Behavior Of Fe4 And Relatementioning

confidence: 99%

See 3 more Smart Citations

Propeller‐Shaped Fe₄ and Fe₃M Molecular Nanomagnets: A Journey from Crystals to Addressable Single Molecules

et al. 2019

Self Cite

View full text Add to dashboard Cite

This Microreview covers the preparation and investigation of Fe 4 and Fe 3 M complexes with a propeller-like structure, most of which function as single-molecule magnets (SMMs). The magnetic characterization of these highly symmetric and chemically versatile complexes has enabled the establishment of important magneto-structural correlations regarding magnetic anisotropy and magnetic relaxation mechanisms in SMM materials. Their chemical stability and easy functionali- [a]

show abstract

Section: Chemistry Of Fe4 and Related Complexesmentioning

confidence: 99%

“…The solid curves provide the best fit to experimental data. Panel (b) adapted from ref., Copyright (2008), with permission from Elsevier.…”

Section: Electronic Structure and Magnetic Behavior Of Fe4 And Relatementioning

confidence: 99%

Section: Electronic Structure and Magnetic Behavior Of Fe4 And Relatementioning

confidence: 99%

Section: Electronic Structure and Magnetic Behavior Of Fe4 And Relatementioning

confidence: 99%

See 2 more Smart Citations

Propeller‐Shaped Fe₄ and Fe₃M Molecular Nanomagnets: A Journey from Crystals to Addressable Single Molecules

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…The synthesis of a family of molecular clusters with formula [Fe 4 (RC(CH 2 O) 3 ) 2 (dpm) 6 ] (where Hdpm is dipivaloylmethane) has been recently reported. They are characterized by an S = 5 ground state and an energy barrier to the reversal of magnetization, U eff ≈ 16 K 20–24. In spite of their quite low blocking temperature (about 1 K), Fe 4 clusters provide the redox stability, structural robustness, and chemical versatility required to build molecular nanodevices.…”

Section: Introductionmentioning

confidence: 99%

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

Margheriti¹,

Mannini²,

Sorace³

et al. 2009

Small

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Magnetostructural Correlations in Tetrairon(III) Single‐Molecule Magnets

Gregoli

Danieli

Barra

et al. 2009

Chemistry A European J

Self Cite

117

View full text Add to dashboard Cite

Tunable single-molecule magnets: The spin-level landscape in a series of Fe(III) (4) single-molecule magnets with propeller-like structure was analyzed by means of high-frequency EPR spectroscopy. The zero-field splitting parameter D of the ground S=5 spin state correlates strongly with the pitch of the propeller gamma (see picture), and thus provides a simple link between molecular structure and magnetic behavior.We report three novel tetrairon(III) single-molecule magnets with formula [Fe(4)(L)(2)(dpm)(6)] (Hdpm=2,2,6,6-tetramethylheptane-3,5-dione), prepared by using pentaerythritol monoether ligands H(3)L=R'OCH(2)C(CH(2)OH)(3) with R'=allyl (1), (R,S)-2-methyl-1-butyl (2), and (S)-2-methyl-1-butyl (3), along with a new crystal phase of the complex containing H(3)L=11-(acetylthio)-2,2-bis(hydroxymethyl)- undecan-1-ol (4). High-frequency EPR (HF-EPR) spectra at low temperature were collected on powder samples in order to determine the zero-field splitting (zfs) parameters in the ground S=5 spin state. In 1-4 and in other eight isostructural compounds previously reported, a remarkable correlation is found between the axial zfs parameter D and the pitch gamma of the propeller-like structure. The relationship is directly demonstrated by 1, which features both structurally and magnetically inequivalent molecules in the crystal. The dynamics of magnetization has been investigated by ac susceptometry, and the results analyzed by master-matrix calculations. The large rhombicities of 2 and 3 were found to be responsible for the fast magnetic relaxation observed in the two compounds. However, complex 3 shows an additional faster relaxation mechanism which is unaccounted for by the set of spin Hamiltonian parameters determined by HF-EPR.

show abstract

Slow quantum relaxation in a tetrairon(III) single-molecule magnet

Cited by 25 publications

References 25 publications

Propeller‐Shaped Fe₄ and Fe₃M Molecular Nanomagnets: A Journey from Crystals to Addressable Single Molecules

Propeller‐Shaped Fe₄ and Fe₃M Molecular Nanomagnets: A Journey from Crystals to Addressable Single Molecules

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

Magnetostructural Correlations in Tetrairon(III) Single‐Molecule Magnets

Contact Info

Product

Resources

About

Slow quantum relaxation in a tetrairon(III) single-molecule magnet

Cited by 25 publications

References 25 publications

Propeller‐Shaped Fe4 and Fe3M Molecular Nanomagnets: A Journey from Crystals to Addressable Single Molecules

Propeller‐Shaped Fe4 and Fe3M Molecular Nanomagnets: A Journey from Crystals to Addressable Single Molecules

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

Magnetostructural Correlations in Tetrairon(III) Single‐Molecule Magnets

Contact Info

Product

Resources

About

Propeller‐Shaped Fe₄ and Fe₃M Molecular Nanomagnets: A Journey from Crystals to Addressable Single Molecules

Propeller‐Shaped Fe₄ and Fe₃M Molecular Nanomagnets: A Journey from Crystals to Addressable Single Molecules