Magnetic properties of two new Fe(4) single-molecule magnets in the solid state and in frozen solution

Chemistry : a European Journal
Christoph SchlegelJoris van Slageren

Abstract

Two novel tetranuclear, star-shaped iron(III) clusters, [Fe(4)(acac)(6)(Br-mp)(2)] and [Fe(III) (4)(acac)(6)(tmp)(2)], are described. Both have S=5 ground states resulting from antiferromagnetic nearest-neighbour superexchange interactions, with J=-8.2 cm(-1) and J=-8.5 cm(-1) for 1 and 2, respectively. Energy barriers for the relaxation of the magnetisation of approximately 12 cm(-1) were derived from AC susceptibility measurements. Magnetic resonance measurements revealed a zero-field splitting parameter D=-0.34 cm(-1) for both complexes. AC susceptibility measurements in solution demonstrated that the complexes are reasonably stable in solution. Interestingly, the magnetisation relaxation slows down significantly in frozen solution, in contrast to what is generally observed for single-molecule magnets. This was shown to result from a large increase in tau(0), the prefactor in the Arrhenius equation, with the energy barrier remaining unchanged.

References

Feb 26, 2004·Angewandte Chemie·Andrea CorniaAnne-Laure Barra
Aug 31, 2004·Inorganic Chemistry·Cristina Cañada-VilaltaGeorge Christou
Sep 29, 2005·Journal of Magnetic Resonance·Stefan Stoll, Arthur Schweiger
Jan 18, 2006·Inorganic Chemistry·En-Che YangDavid N Hendrickson
Apr 6, 2006·Journal of the American Chemical Society·Stefania AccorsiLaura Zobbi
Jun 6, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Rolf W SaalfrankPaul Müller
Oct 15, 2008·Physical Review Letters·C SchlegelM Dressel
Oct 31, 2008·Chemistry : a European Journal·Guillem AromíSimon J Teat
Dec 17, 2008·Angewandte Chemie·Lapo BoganiAndrea Cornia
Feb 3, 2009·Nature Materials·Matteo ManniniRoberta Sessoli
Mar 5, 2009·Physical Review Letters·Susumu TakahashiMark S Sherwin
Apr 14, 2009·Inorganic Chemistry·Dante GatteschiRoberta Sessoli

❮ Previous
Next ❯

Citations

Sep 10, 2014·Chemistry : a European Journal·Kátia Cristina M WestrupRoberta Sessoli
Mar 15, 2014·Chemical Communications : Chem Comm·Kasper S PedersenRodolphe Clérac
Jun 14, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Julia MayansAlbert Escuer
Jan 3, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Pasquale TotaroRoberta Sessoli
Sep 10, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Peter Happ, Eva Rentschler
Oct 22, 2014·Chemical Communications : Chem Comm·Yuan-Yuan ZhuSong Gao
Feb 28, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·E BurzuríH S J van der Zant

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.