Homo- (4f, 4f) and Heterodimetallic (4f, 4f‘) Complexes. The First Structurally Characterized Example of a Heterodimetallic (Yb, La) Complex (1‘). Magnetic Properties of 1‘ and of a Homodinuclear (Gd, Gd) Analogue

Costes, Jean‐Pierre; Dahan, Françoise; Dupuis, Arnaud; Lagrave, S; Laurent, Jean‐Pierre

doi:10.1021/ic9712481

Cited by 137 publications

(100 citation statements)

References 23 publications

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“…It happens only at low pH values if the acidity released during the complexation is not neutralized with a base. Our results are in accordance with those of Costes et al, [9] and Kocian et al [10] In this latter case, triethylamine proves to be too weak to allow the recovering of imine-phenole Gd III complexes, only a strong base like hydroxide or methoxide ion permits the preparation of the desired chelates.…”

Section: Results and Discussion Preparationsupporting

confidence: 93%

Tripodal Iminophenolate Ligand Complexes of Gallium(III), Indium(III), and Thallium(III)

Figuet

Averbuch-Pouchot

d′Hardemare

et al. 2001

Eur. J. Inorg. Chem.

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The polydentate tripodal Schiff base ligand H 3 L has been prepared by treating a methanolic solution of tris(aminoethyl)-amine and 5-bromosalicylaldehyde. This ligand, and its complexes with group-13 metal ions (Ga III , In III , and Tl III ) have been characterized by elemental analysis, NMR spectroscopy, FAB + -MS, and X-ray diffraction analysis. The ligand, not preorganized in the solid state, acts as a hexadentate N 3 O 3 ligand in all cases to form octahedral structures, the

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Section: Results and Discussion Preparationsupporting

confidence: 93%

Tripodal Iminophenolate Ligand Complexes of Gallium(III), Indium(III), and Thallium(III)

Figuet

Averbuch-Pouchot

d′Hardemare

et al. 2001

Eur. J. Inorg. Chem.

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“…Since 1) no magnetic coupling occurs at room temperature between the Ln III ions lying at distances larger than 4 ä [40] …”

Section: Introductionmentioning

confidence: 99%

The First Self‐Assembled Trimetallic Lanthanide Helicates Driven by Positive Cooperativity

Floquet

Ouali

Bocquet

et al. 2003

Chemistry A European J

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by paramagnetic NMR spectroscopy and linear correlations for Ln Ce ± Tb imply isostructurality for these larger lanthanides. NMR spectra point to the triple helical structure being maintained in solution, but an inversion of the magnitude of the second-rank crystal-field parameters, obtained by LIS analysis, for the LnN 6 O 3 and LnN 9 sites with respect to the parameters extracted for Eu III from luminescence data, suggests that the geometry of the central LnN 9 site is somewhat relaxed in solution.

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“…6 In recent years, an increasing interest has been devoted to the magnetic properties of dinuclear compounds 7 featuring simultaneously either 4f and 3d ions, 8-11 identical 4f ions 12-16 or even two different lanthanide (4f-4fЈ) ions, 17 since they can serve as models or precursors for novel magnetic materials, e.g. high-temperature superconducting ceramics.…”

Section: Introductionmentioning

confidence: 99%

Structural characterisation, EPR and magnetic properties of f–f and f–d lanthanide(iii) phenolic cryptates

Avecilla

Platas‐Iglesias

Rodríguez-Cortiñas

et al. 2002

J. Chem. Soc., Dalton Trans.

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The Schiff base axial macrobicyclic ligand L 1 forms 4f-4f and 4f-3d cryptates with formula [Gd 2 (L 1 Ϫ 3H)(The crystal structures of the five compounds have been determined by X-ray crystallography. The ligand is helically wrapped around the two metal ions, leading to pseudo-C 3 symmetries around the metals. In the solid state, the conformation of the cation in 1 and 2 is Λ(δδλ) 5 (δδλ) 5 or its enantiomeric form ∆(λλδ) 5 (λλδ) 5 , while in 3, 4 and 5 it can be described as Λ(δδλ) 5 (δЈδЈδЈ) 5 (or ∆(λλδ) 5 (λЈλЈλЈ) 5 ). In 1, only one enantiomer is found in the crystal lattice, whereas in the other four compounds, both enantiomers are co-crystallised. The magnetic behaviour of the homodinuclear (Gd, Gd) and the heterodinuclear (Gd, Cu) cryptates points to a significant magnetic interaction between the two metal ions. This magnetic interaction is antiferromagnetic in the case of the Gd-Gd cryptate 1 (J = Ϫ0.194(6) cm Ϫ1 ), but ferromagnetic for the Gd-Cu one (J = 2.2(1) cm Ϫ1 ). The antiferromagnetic coupling observed for 1 is one of the largest ever reported. Although the ferromagnetic coupling observed for 3 is relatively weak, which is attributed to the strong bending of the bridging network, it is considerably stronger than the one reported for [GdCu(L 2 Ϫ 3H)(DMF)](ClO 4 ) 2 ؒMeCN. In spite of the similar coordination environment of the Gd() ion in compounds 1, 3 and 5 their EPR spectra are different, thereby confirming the magnetic interactions between the Gd() ion and the Cu() ion in 3 and the other Gd() ion in 1.

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Homo- (4f, 4f) and Heterodimetallic (4f, 4f‘) Complexes. The First Structurally Characterized Example of a Heterodimetallic (Yb, La) Complex (1‘). Magnetic Properties of 1‘ and of a Homodinuclear (Gd, Gd) Analogue

Cited by 137 publications

References 23 publications

Tripodal Iminophenolate Ligand Complexes of Gallium(III), Indium(III), and Thallium(III)

Tripodal Iminophenolate Ligand Complexes of Gallium(III), Indium(III), and Thallium(III)

The First Self‐Assembled Trimetallic Lanthanide Helicates Driven by Positive Cooperativity

Structural characterisation, EPR and magnetic properties of f–f and f–d lanthanide(iii) phenolic cryptates

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