MeOH-coordinated Mn12 single-molecule magnet: structure and magnetic properties of [Mn12O12(OAc)16(MeOH)4]

Bian, Guo‐Qing; Kuroda–Sowa, Takayoshi; Gunjima, Nozomu; Maekawa, Masahiko; Munakata, Megumu

doi:10.1016/j.inoche.2004.12.002

Cited by 16 publications

(11 citation statements)

References 27 publications

(27 reference statements)

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“…When QTM steps are clearly observed in hysteresis loops, they are invaluable as a direct measure of the D value, since the field separation between the steps, DH, is proportional to D and given by eqn (13). In fact, this equation provides |D|/g, not |D|, but for the Mn 12 family (and for most other Mn (and Fe) SMMs) the g value is typically B2.0 and eqn (13) thus provides a very good approximation of D for comparison with values obtained from other methods.…”

Section: Magnetochemistrymentioning

confidence: 99%

The Drosophila of single-molecule magnetism: [Mn12O12(O2CR)16(H2O)4]

2009

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Single-molecule magnets (SMMs) are individual molecules that can function as nanoscale magnetic particles. The [Mn12O12(O2CR)16(H2O)4] (Mn12; R=Me, Et, etc.) family of SMMs was the first one discovered; it is also the one whose study has provided the majority of current knowledge on this interesting magnetic phenomenon, prompting its description here as the Drosophila of the field. This tutorial review will survey the various chemical studies that have been carried out to date on this family. This will include a discussion of methods that have been developed for their structural and redox transformation, and the effect of the latter on the magnetic and SMM properties.

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Section: Magnetochemistrymentioning

confidence: 99%

The Drosophila of single-molecule magnetism: [Mn12O12(O2CR)16(H2O)4]

2009

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“…In the absence of applied fields, magnetic ordering with a Curie temperature of about 0.9 K [12,9] has been predicted. [15,16,17]. All the parameters are nearly identical to Mn 12 -acetate.…”

Section: Introductionmentioning

confidence: 79%

Quantum fluctuations and long-range order in molecular magnets

et al. 2013

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We review our studies of the effect of transverse fields on the susceptibility and magnetization of single crystals of the prototype single molecule magnet (SMM), Mn 12 -acetate, and of a new high-symmetry variant, Mn 12 -acetate-MeOH. SMM single crystals can exhibit long range ferromagnetic order associated with intermolecular dipole interactions. Transverse fields increase quantum spin fluctuation and quantum tunneling of the magnetization suppressing long range order. However, we have found that suppression of the Curie temperature by a transverse field in Mn 12 -acetate is far more rapid than predicted by the Transverse-Field Ising Ferromagnetic Model (TFIFM). It appears that solvent disorder in Mn 12 -acetate that results in an intrinsic distribution of small discrete tilts of the molecular magnetic easy axis from the global easy axis of the crystal (≈ ±1 • ) gives rise to a distribution of random-fields that further suppresses long-range order. Semiquantitative agreement with the predictions of a Random-Field Ising Ferromagnet Model is found. Subsequent susceptibility studies we have conducted of the high symmetry Mn 12 variant, Mn 12acetate-MeOH, with the same spin structure and similar lattice constants but without the same solvent disorder as Mn 12 -acetate, agrees with the TFIFM. An important implication of our studies is that long-range order in these two chemically very similar SMMs are described by distinct physical models.

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“…Furthermore, the molecules/ions often assemble in low dimensional compounds providing easier systems to study both theoretical and experimentally. Some systems are even classified as Single Molecule Magnets, since the organically bridged metal clusters, exhibit magnetic properties similar to those observed in conventional bulk magnets like remanence and hysteresis (Bian et al, 2005). The title compound, (I), Fig.1 12Å] are within the range expected for a delocalized C-N bond.…”

Section: Data Collectionmentioning

confidence: 92%

“…For related literature, see: Bian et al (2005); Kemme et al (1988); Klement et al (1995); Pereira Silva et al (2006); Pereira Silva et al (2007).…”

Section: Related Literaturementioning

confidence: 99%

Bis(triphenylguanidinium) tetrachloridocuprate(II)

et al. 2008

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The structure of the title compound, (C19H18N3)2[CuCl4], consists of square-planar [CuCl4]2− anions and triphenylguanidinium cations. The CuII ion occupies a crystallographic inversion centre. In the cation, the dihedral angles between the phenyl rings and the plane defined by the central guanidinium fragment are in the range 51.9 (4)–64.4 (3)°. N—H⋯Cl hydrogen bonds assemble the ions into infinite chains running along the b axis.

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MeOH-coordinated Mn12 single-molecule magnet: structure and magnetic properties of [Mn12O12(OAc)16(MeOH)4]

Cited by 16 publications

References 27 publications

The Drosophila of single-molecule magnetism: [Mn12O12(O2CR)16(H2O)4]

The Drosophila of single-molecule magnetism: [Mn12O12(O2CR)16(H2O)4]

Quantum fluctuations and long-range order in molecular magnets

Bis(triphenylguanidinium) tetrachloridocuprate(II)

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