Synthesis, crystal structure and magnetic properties of novel Mn 12 single-molecule magnets with thiophenecarboxylate, [Mn 12 O 12 (O 2 CC 4 H 3 S) 16 (H 2 O) 4 ], and its tetraphenylphosphonium salt

Kuroda–Sowa, Takayoshi; Nogami, T.; Konaka, Hisashi; Maekawa, Masahiko; Munakata, Megumu; Miyasaka, Hitoshi; Yamashita, Masahiro

doi:10.1016/s0277-5387(03)00184-0

Cited by 33 publications

(23 citation statements)

References 18 publications

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“…Thiophenecarboxylates have also been extensively employed to obtain transition‐metal coordination complexes 29–36. However, rather few magnetic studies have been reported 37–42…”

Section: Introductionmentioning

confidence: 99%

Structure and Magnetic Properties of a New 1D Nickel(II) Hydroxythiophenedicarboxylate

et al. 2009

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The new carboxylato‐bridged NiII network {Ni3(μ3‐OH)2[(κ1‐κ1)‐(κ1‐κ1)‐μ4tdc]2(H2O)4}n (H2tdc = 2,5‐thiophenedicarboxylic acid) has been synthesized hydrothermally. The structure has been characterized by synchrotron powder X‐ray diffraction, thermogravimetric analysis, IR and UV/Vis spectroscopy. The title compound consists of [Ni1O6]2[Ni2O6] chains built of two edge‐sharing octahedrons “Ni1O6” linked via μ3‐OH to a vertex of the Ni2 octahedron. The connection between the chains is settled by the tdc2– anions, leading to a 3D framework. The title compound exhibits a metamagnetic transition (TN = 3.0 K, μ0HC = 0.13 T at 1.8 K). This behaviour results from chains of ferromagnetic dimers coupled antiferromagnetically with intermediate Ni2, the competing set of interactions leading to a resultant moment. At low temperature, a 3D antiferromagnetic ordering occurs between the chains. The magnetic Ni–Ni interactions were evaluated by numerical resolution of the corresponding spin Hamiltonian. The structural and magnetic properties were compared with those of compounds exhibiting similar structural features and based on fumarate (fum2–), terephthalate (tp2–) and 1,4‐cyclohexanedicarboxylate (chdc2–).(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)

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“…Thiophenecarboxylates have also been extensively employed to obtain transition‐metal coordination complexes 29–36. However, rather few magnetic studies have been reported 37–42…”

Section: Introductionmentioning

confidence: 99%

Structure and Magnetic Properties of a New 1D Nickel(II) Hydroxythiophenedicarboxylate

et al. 2009

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“…In this way, one may affect subtle variations in the symmetry/anisotropy of the cluster. One can also reduce the ͓Mn 12 O 12 ͔ 16+ core by adding electrons, with up to three electrons having been successfully added to date; 11,[14][15][16][17] this approach may be used to realize half-integer spin states for studies of, e.g., parity effects. 18,19 In this study, we focus on a subset of relatively highsymmetry ͑ϳS 4 ͒ integer spin S = 10 complexes, while emphasizing the influence of the ligand/solvent environment on the quantum dynamics.…”

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confidence: 99%

Crystal lattice desolvation effects on the magnetic quantum tunneling of single-molecule magnets

Redler

Lampropoulos²,

Datta³

et al. 2009

Phys. Rev. B

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High-frequency electron paramagnetic resonance ͑HFEPR͒ and alternating current ͑ac͒ susceptibility measurements are reported for a new high-symmetry Mn 12 OH complexes. These comparisons reveal important insights into the factors that influence the values of the effective barrier to magnetization reversal, U ef f , deduced on the basis of ac susceptibility measurements. In particular, we find that variations in U ef f can be correlated with the degree of disorder in a crystal which can be controlled by desolvating ͑drying͒ samples. This highlights the importance of careful sample handling when making measurements on SMM crystals containing volatile lattice solvents. The HFEPR data additionally provide spectroscopic evidence suggesting that the relatively weak disorder induced by desolvation influences the quantum tunneling interactions and that it is under-barrier tunneling that is responsible for a consistent reduction in U ef f that is found upon drying samples. Meanwhile, the axial anisotropy deduced from HFEPR is found to be virtually identical for all four Mn 12 complexes, with no measurable reduction upon desolvation.

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“…For grasping its chemical characters and properties more thoroughly, many Mn 12 clusters have been prepared by the chemical modification including substitutions of bridging acetates to other carboxylates [4][5][6] or to oxo anions other than carboxylates [7][8][9], and partial substitutions of a peripheral Mn III ion to an Fe III ion [10] or a Cr III ion [11]. Although most of Mn 12 complexes reported so far have four coordinating water molecules, only a few examples [4,[12][13][14][15] are known to have three or two coordinating water molecules, and only one complex does not contain any coordinating water molecules [16]. Some evidences have already confirmed that the nature of the terminal ligand can affect on the magnetic properties of [Mn 2 (l-O) (RCOO) 2 ] 2+ family complexes [17,18].…”

mentioning

confidence: 99%

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

Bian¹,

Kuroda–Sowa²,

Gunjima³

et al. 2005

Inorganic Chemistry Communications

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Synthesis, crystal structure and magnetic properties of novel Mn 12 single-molecule magnets with thiophenecarboxylate, [Mn 12 O 12 (O 2 CC 4 H 3 S) 16 (H 2 O) 4 ], and its tetraphenylphosphonium salt

Cited by 33 publications

References 18 publications

Structure and Magnetic Properties of a New 1D Nickel(II) Hydroxythiophenedicarboxylate

Structure and Magnetic Properties of a New 1D Nickel(II) Hydroxythiophenedicarboxylate

Crystal lattice desolvation effects on the magnetic quantum tunneling of single-molecule magnets

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

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