Single Molecule Magnets

Yamashita, Masahiro; Katoh, K.

doi:10.1002/9783527694228.ch4

Cited by 7 publications

(2 citation statements)

References 67 publications

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“…Compound 4 shows trinuclear copper(II) clusters, which are interesting because of potential magnetic frustration − and, in some cases, can behave as single-molecule magnets (SMMs). SMMs carry information encoded in their spin states, interact differently with magnetic materials, and have potential applications in molecular memory devices. , Active research to develop MOF-based SMMs is taking place because MOFs are versatile and can be tuned for the desired structure and properties. − The magnetism of the trinuclear paramagnetic copper(II) species 4 was studied through SQUID magnetometry.…”

Section: Resultsmentioning

confidence: 99%

Three Sequential Hydrolysis Products of the Ubiquitous Cu₂₄ Isophthalate Metal–Organic Polyhedra

et al. 2019

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Metal–organic polyhedra (MOPs) are increasingly studied as host–guest capsules, linked into networks, or incorporated into composite materials. As such, understanding the decomposition of MOP structures is of fundamental importance. The degradation of the ubiquitous copper(II) MOP Cu24[5-(hydroxy)isophthalate]24 (1) is studied in liquid water. At different intervals of water exposure, powder X-ray diffraction (PXRD) is performed and stepwise conversion of the MOP into three different coordination polymers is observed. First, the formation of a 2D coordination polymer, 2, is observed, which upon further exposure gives a 1D coordination polymer, 3, and finally a trinuclear copper(II) complex, 4. Compound 2 is characterized by PXRD owing to its transient nature, while 3 and 4 are characterized crystallographically. The final structure, 4, contains copper(II) trimers, and so its magnetic behavior is also investigated.

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Section: Resultsmentioning

confidence: 99%

Three Sequential Hydrolysis Products of the Ubiquitous Cu₂₄ Isophthalate Metal–Organic Polyhedra

et al. 2019

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“…The related study of single-molecule magnets (0D magnetism, SMMs) and single-chain magnets (1D magnetism, SCMs) are relatively new areas of research with reports of experimentally observed phenomena only appearing within the last few decades . Attention for these fields has grown rapidly since their initial reports. , In this context, a strategy that has gained increasing interest is the control of magnetic properties by the encapsulation of molecular magnetic units within a rigid coordination polymer superstructure such as in MOFs. , This strategy may also offer a unique opportunity to explore the frontier between molecular magnets and classical bulk magnets.…”

Section: Introductionmentioning

confidence: 99%

Slow Magnetic Relaxation of Co(II) Single Chains Embedded within Metal–Organic Superstructures

et al. 2019

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Two coordination polymers of the type Co(BPDC)(N-ox), with BPDC being 4,4′-biphenyldicarboxylate and N-ox being pyridine N-oxide (PNO) or isoquinoline N-oxide (IQNO), have been synthesized and characterized. The compounds feature 2D and 3D metal–organic networks that encapsulate Co(II)-based chains in a rigid superstructure. The dc and ac magnetic properties of these Co(BPDC)(N-ox) materials have been investigated alongside those of a related Co(BDC)(PNO) compound (where BDC is 1,4-benzenedicarboxylate), which contains a smaller dicarboxylate linker. These Co(II)-containing coordination polymers exhibit slow magnetic relaxation, as observed by ac susceptibility measurements. The observed magnetic behavior of all compounds is consistent with an antiferromagnetic interaction between canted Co spins along the 1D skeleton, resulting in single-chain magnet behavior. In the case of Co(BPDC)(IQNO), weak interchain magnetic interactions yield 3D antiferromagnetic order while the inherent magnetic behavior stemming from the chain component is maintained. The combination of these effects in this material puts it at the frontier between single-chain magnets and classical bulk antiferromagnets. This work contributes to the limited group of materials featuring the organization of single-chain magnets within a coordination polymer superstructure.

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Spectroscopic Studies of the Magnetic Excitation and Spin‐Phonon Couplings in a Single‐Molecule Magnet

Stavretis

Moseley

Fei

et al. 2019

Chemistry A European J

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Large separations between ground and excited magnetic states in single‐molecule magnets (SMMs) are desirable to reduce the likelihood of spin reversal in the molecules. Spin‐phonon coupling is a process leading to magnetic relaxation. Both the reversal and coupling, making SMMs lose magnetic moments, are undesirable. However, direct determination of large magnetic states separations (>45 cm−1) is challenging, and few detailed investigations of the spin‐phonon coupling have been conducted. The magnetic separation in [Co(12‐crown‐4)2](I3)2(12‐crown‐4) (1) is determined and its spin‐phonon coupling is probed by inelastic neutron scattering (INS) and far‐IR spectroscopy. INS, using oriented single crystals, shows a magnetic transition at 49.4(1.0) cm−1. Far‐IR reveals that the magnetic transition and nearby phonons are coupled, a rarely observed phenomenon, with spin‐phonon coupling constants of 1.7–2.5 cm−1. The current work spectroscopically determines the ground–excited magnetic states separation in an SMM and quantifies its spin‐phonon coupling, shedding light on the process causing magnetic relaxation.

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Single Molecule Magnets

Cited by 7 publications

References 67 publications

Three Sequential Hydrolysis Products of the Ubiquitous Cu₂₄ Isophthalate Metal–Organic Polyhedra

Three Sequential Hydrolysis Products of the Ubiquitous Cu₂₄ Isophthalate Metal–Organic Polyhedra

Slow Magnetic Relaxation of Co(II) Single Chains Embedded within Metal–Organic Superstructures

Spectroscopic Studies of the Magnetic Excitation and Spin‐Phonon Couplings in a Single‐Molecule Magnet

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Single Molecule Magnets

Cited by 7 publications

References 67 publications

Three Sequential Hydrolysis Products of the Ubiquitous Cu24 Isophthalate Metal–Organic Polyhedra

Three Sequential Hydrolysis Products of the Ubiquitous Cu24 Isophthalate Metal–Organic Polyhedra

Slow Magnetic Relaxation of Co(II) Single Chains Embedded within Metal–Organic Superstructures

Spectroscopic Studies of the Magnetic Excitation and Spin‐Phonon Couplings in a Single‐Molecule Magnet

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Three Sequential Hydrolysis Products of the Ubiquitous Cu₂₄ Isophthalate Metal–Organic Polyhedra

Three Sequential Hydrolysis Products of the Ubiquitous Cu₂₄ Isophthalate Metal–Organic Polyhedra