Local magnetic moments in a dinuclear Co<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>complex as seen by polarized neutron diffraction:Beyond the effective spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mfrac><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:mfrac></mml:mrow></mm

Borta, Ana; Gillon, B.; Gukasov, Arsen; Cousson, A.; Luneau, Dominique; Jeanneau, Erwann; Ciumacov, Iurii; Sakiyama, Hiroshi; Tone, Katsuya; Mikuriya, Masahiro

doi:10.1103/physrevb.83.184429

Cited by 26 publications

(26 citation statements)

References 19 publications

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“…This method has already been employed to address the magnetic anisotropy in inorganic compounds. [11,12] It has also been applied to molecular solids [13,14] but only using high magnetic fields (7 T) for which the magnetization deviates strongly from linearity. In such cases, the tensor components were used as intermediate parameters for the determination of the local induced magnetic moments.…”

Section: Polarized Neutron Diffraction To Probe Local Magnetic Anisotmentioning

confidence: 99%

Polarized Neutron Diffraction to Probe Local Magnetic Anisotropy of a Low‐Spin Fe(III) Complex

et al. 2016

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We have determined by polarized neutron diffraction (PND) the low‐temperature molecular magnetic susceptibility tensor of the anisotropic low‐spin complex PPh4[FeIII(Tp)(CN)3]⋅H2O. We found the existence of a pronounced molecular easy magnetization axis, almost parallel to the C3 pseudo‐axis of the molecule, which also corresponds to a trigonal elongation direction of the octahedral coordination sphere of the FeIII ion. The PND results are coherent with electron paramagnetic resonance (EPR) spectroscopy, magnetometry, and ab initio investigations. Through this particular example, we demonstrate the capabilities of PND to provide a unique, direct, and straightforward picture of the magnetic anisotropy and susceptibility tensors, offering a clear‐cut way to establish magneto‐structural correlations in paramagnetic molecular complexes.

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Section: Polarized Neutron Diffraction To Probe Local Magnetic Anisotmentioning

confidence: 99%

Polarized Neutron Diffraction to Probe Local Magnetic Anisotropy of a Low‐Spin Fe(III) Complex

et al. 2016

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“…This could be due to the different orientations of the local axis of anisotropy for each Co 2 + ions. [20][21] As we have only powder data, using a more sophisticated model taking into account the local orientation of the anisotropy axis would lead to an over parameterized model with questionable values for the parameters.…”

Section: Static Magnetic Propertiesmentioning

confidence: 99%

“…The relaxation time of the complex, t relative to the above T B is related to the frequencies, n, by the following equation: t = 1/(2p n). In order to obtain the temperature dependence of the relaxation time t, the Cole-Cole plots were fitted using generalized Debye model 21 (Figure 6). Details on this modelisation are given in supporting information.…”

Section: Dynamic Magnetic Propertiesmentioning

confidence: 99%

Hydroxide‐Bridged Mixed‐Valence Tetranuclear Cobalt 4‐Nitrophenol Inclusion Complex Showing Single Molecule Magnet Property

Shankar

Mondal

et al. 2017

ChemistrySelect

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Two tetranuclear hydroxide‐bridged mixed‐valence cobalt complexes, one having 4‐nitrophenolate anions and other having 4‐nitrophenol as guest, namely [(μ2‐dea)2(phen)2Co2(μ3‐OH)2Co2(phen)2](np)4•H2O (1), [(μ2‐dea)2(phen)2Co2(μ3‐OH)2 Co2(phen)2]Cl4•2Hnp•9H2O (2) (Hnp=4‐nitrophenol, phen=1,10‐phenanthroline, dea=di‐deprotonated diethanolamine) were synthesized and structurally characterized. Complex cation of these two complexes are based on Co4O4(OH)2 units where two cobalt ions are in Co2+ and other two are in Co3+ oxidation states. Reaction of same set of reactants namely phen, Hnp and diethanolamine with cobalt nitrate in presence or absence of hydrochloric acid resulted complex 1 and 2 respectively. The two triply‐bridging hydroxides of complex 1 are in identical environment, but the complex 2 has two triply‐bridging hydroxides in slightly different environments having differences in Co‐O(hydroxide) bond distances around them. Complex 2 is ferromagnetic and shows field induced Single Molecule Magnets (SMM) behavior.

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“…[1][2][3][4][5][6] In order to expand the system to new metal ions, a magnesium(II) derivative was prepared and its crystal structure was determined by the single-crystal X-ray method.Single crystals of [Mg2(sym-hcp)2](BPh4)2·2acetone·2H2O were prepared as follows: to a methanolic solution of magnesium(II) acetate tetrahydrate (0.21 g, 1.0 mmol) was added a methanolic solution of H(sym-hcp) (0.30 g, 1.0 mmol) and LiOH (0.02 g, 0.5 mmol); the resulting solution was refluxed for 1 h. After the addition of sodium tetraphenylborate (0.34 g, 1.0 mmol), upon cooling, colorless precipitation was obtained. The compound was recrystallized from acetone, and the recrystallized sample was used for an X-ray diffraction study.…”

mentioning

confidence: 99%

“…[1][2][3][4][5][6] In order to expand the system to new metal ions, a magnesium(II) derivative was prepared and its crystal structure was determined by the single-crystal X-ray method.…”

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confidence: 99%

Crystal Structure of a Dinuclear Magnesium(II) Complex with 4-Chloro-2,6-bis[(2-hydroxyethyl)methylaminomethyl]phenolate

Sakiyama

Takahata

Kashimoto

et al. 2017

X-ray Structure Analysis Online

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75Phenol-based dinucleating ligands, 2,6-bis[(2-hydroxyethyl)-methylaminomethyl]-4-methylphenolate [(sym-hmp) -] and 4-chloro-2,6-bis[(2-hydroxyethyl)methylaminomethyl]phenolate [(sym-hcp) -], are capable of forming dinuclear metal complexes [metal = cobalt(II), nickel(II), manganese(II), and zinc(II)]. [1][2][3][4][5][6] In order to expand the system to new metal ions, a magnesium(II) derivative was prepared and its crystal structure was determined by the single-crystal X-ray method.Single crystals of [Mg2(sym-hcp)2](BPh4)2·2acetone·2H2O were prepared as follows: to a methanolic solution of magnesium(II) acetate tetrahydrate (0.21 g, 1.0 mmol) was added a methanolic solution of H(sym-hcp) (0.30 g, 1.0 mmol) and LiOH (0.02 g, 0.5 mmol); the resulting solution was refluxed for 1 h. After the addition of sodium tetraphenylborate (0.34 g, 1.0 mmol), upon cooling, colorless precipitation was obtained. The compound was recrystallized from acetone, and the recrystallized sample was used for an X-ray diffraction study. Crystal data are included in Table 1. The structure was solved by direct methods and expanded using Fourier techniques. In order to eliminate the effect of abnormally strong reflections above 2θ > 55 , the "OMIT -10 55" command was executed. The non-hydrogen atoms were refined anisotropically, and hydrogen atoms were refined using the riding model. It is noted that all hydrogen atoms of OH groups were found in the difference Fourier map. The final cycle of a full-matrix leastsquares refinement on F 2 was allowed to satisfactory converge with R1 = 0.042 [I > 2σ(I)].The crystal structure consists of [Mg2(sym-hcp)2] 2+ complex cations, tetraphenylborate anions, acetone molecules, and water molecules in a 1:2:2:2 molar ratio. (Figs. 1 and 2). In the complex cation (Fig. 3), a pair of sym-hcp -ligands incorporates two magnesium(II) ions, bridged by two phenolate oxygen atoms of sym-hcp -, forming a bis-μ-phenolato-dimagnesium(II) core structure. The Mg(1)···Mg(2) separation is 3.1433(10)Å (Table 2), and very similar separations were found in the isomorphous dinuclear metal complexes: 2+ are almost equivalent, and the symmetry of the dimagnesium core is approximated as D2 symmetry (in a precise sense C2 symmetry); the dimagnesium core is twisted along the Mg···Mg axis. The dihedral angle between the two terminal N···N edges is ~51 , and the dihedral angle between the two alcoholic O···O axes is ~33 . As observed in the related isomorphous complexes, . In addition to the hydrogen bonds, OH···π interaction was observed between the water molecule and one of the phenyl groups of tetraphenylborate anion.In conclusion, the [Mg2(sym-hmp)2] 2+ complex cation was found to have a bis-μ-phenolato-dimagnesium(II) core structure, and each magnesium(II) ion was found to have a distorted octahedral geometry.

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Local magnetic moments in a dinuclear Co2+complex as seen by polarized neutron diffraction:Beyond the effective spin-12

Cited by 26 publications

References 19 publications

Polarized Neutron Diffraction to Probe Local Magnetic Anisotropy of a Low‐Spin Fe(III) Complex

Polarized Neutron Diffraction to Probe Local Magnetic Anisotropy of a Low‐Spin Fe(III) Complex

Hydroxide‐Bridged Mixed‐Valence Tetranuclear Cobalt 4‐Nitrophenol Inclusion Complex Showing Single Molecule Magnet Property

Crystal Structure of a Dinuclear Magnesium(II) Complex with 4-Chloro-2,6-bis[(2-hydroxyethyl)methylaminomethyl]phenolate

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