Hexacyanometalate molecular chemistry: trinuclear CrNi 2 complexes; micro-SQUID magnetisation studies of intermolecular interactions

Tiron, Raluca; Wernsdorfer, Wolfgang; Tuyèras, Fabien; Scuiller, Ariane; Marvaud, Valérie

doi:10.1016/s0277-5387(03)00248-1

Cited by 9 publications

(3 citation statements)

References 30 publications

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“…The key idea is to use polydentate amine ligands in order to avoid polymerization and get discrete entities with well-defined spin and anisotropy [15,16]. Most of the compounds are fully described in the literature [17,18]. They may be divided into two groups: (i) isotropic high spin molecules (CrCu 6 , CrNi 6 , and CrMn 6 ) and (ii) nearly isotropic molecules with no detectable energy gap or small one 1 K (CrCu 4 , CrNi 2 , CrNiMn 5 , CrNi 2 Mn 4 , CrNi 2 Ni 4 ).…”

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confidence: 99%

Experimental Estimates of Dephasing Time in Molecular Magnets

et al. 2007

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Muon spin relaxation measurements in isotropic molecular magnets (MM) with a spin value S ranging from 7/2 to 27/2 are used to determine the magnitude and origin of dephasing time tau(phi) of molecular magnets. It is found that tau(phi) approximately 10 nsec with no S or ligand dependence. This indicates a nuclear origin for the stochastic field. Since tau(phi) is a property of the environment, we argue that it is a number common to similar types of MM. Therefore, tau(phi) is shorter than the Zener and tunneling times of anisotropic MM such as Fe(8) or Mn(4) for standard laboratory sweep rates. Our findings call for a stochastic Landau-Zener theory in this particular case.

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confidence: 99%

Experimental Estimates of Dephasing Time in Molecular Magnets

et al. 2007

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“…A series of bi-, tri-, tetra-, hexa-and hepta-nuclear heterobimetallic complexes are reported [M(CN) n2 (CN-M'Lp) 6 ). 94 They differ from each other by the nature of the terminal ligand and of the counter anion. The ground state spin value is 7/2 for the three systems (ferromagnetic interaction between chromium(III) and nickel(II) ions).…”

Section: Oxidation State (Iii) Chromiummentioning

confidence: 99%

13 Chromium, molybdenum, and tungsten

Matthews

2004

Annu. Rep. Prog. Chem., Sect. A: Inorg. Chem.

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“…Here we report the magnetic relaxation behavior in three isostructural cyano-bridged 3d-4f linear heterotrinuclear compounds, ( (2); Ln = Dy III , TM = Co III (3); HMPA = hexamethylphosphoramide}, in which the central lanthanide ions exhibit an axially elongated octahedral coordination geometry with a perfect D 4h symmetry. Utilizing the [TM(CN) 6 ] 3− (TM = Fe III , Cr III ) precursors as bridging or terminal ligands has been reported to successfully construct similar trinuclear structure with another transition metal ion [42,43].…”

Section: Introductionmentioning

confidence: 99%

The Exploration and Analysis of the Magnetic Relaxation Behavior in Three Isostructural Cyano-Bridged 3d–4f Linear Heterotrinuclear Compounds

Xiong

Liu

et al. 2018

Inorganics

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Three isostructural cyano-bridged 3d-4f linear heterotrinuclear compounds, (H 2.5 O) 4 {Ln[TM(CN) 5 (CNH 0.5)] 2 (HMPA) 4 } (Ln = Y III , TM = [Fe III ] LS (1); Ln = Dy III , TM = [Fe III ] LS (2); Ln = Dy III , TM = Co III (3)), have been synthesized and characterized by single-crystal X-ray diffraction. Due to the steric effect of the HMPA ligands, the central lanthanide ions in these compounds possess a low coordination number, six-coordinate, exhibiting a coordination geometry of an axially elongated octahedron with a perfect D 4h symmetry. Four HMPA ligands situate in the equatorial plane around the central lanthanide ions, and two [TM(CN) 5 (CNH 0.5)] 2.5− entities occupy the apical positions to form a cyano-bridged 3d-4f linear heterotrinuclear structure. The static magnetic analysis of the three compounds indicated a paramagnetic behavior of compounds 1 and 3, and possible small magnetic interactions between the intramolecular Dy III and [Fe III ] LS ions in compound 2. Under zero dc field, the ac magnetic measurements on 2 and 3 revealed the in-phase component (χ) of the ac susceptibility without frequency dependence and silent out-of-phase component (χ"), which was attributed to the QTM effect induced by the coordination geometry of an axially elongated octahedron for the Dy III ion. Even under a 1 kOe applied dc field, the χ" components of 2 were revealed frequency dependence without peaks above 2 K. And under a 2 kOe and 3 kOe dc field, the χ" components of 3 exhibited weak frequency dependence below 4 K with the absence of well-shaped peaks, which confirmed the poor single-ion magnetic relaxation behavior of the six-coordinate Dy III ion excluding any influence from the neighboring [Fe III ] LS ions as that in the analogue 2.

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Hexacyanometalate molecular chemistry: trinuclear CrNi 2 complexes; micro-SQUID magnetisation studies of intermolecular interactions

Cited by 9 publications

References 30 publications

Experimental Estimates of Dephasing Time in Molecular Magnets

Experimental Estimates of Dephasing Time in Molecular Magnets

13 Chromium, molybdenum, and tungsten

The Exploration and Analysis of the Magnetic Relaxation Behavior in Three Isostructural Cyano-Bridged 3d–4f Linear Heterotrinuclear Compounds

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