The ferromagnetic [Ln 2 Co 6 ] heterometallic complexes

Jiang

et al. 2018

Inorg. Chem.

Two enantiomeric pairs of new 3d-4f heterometallic clusters have been built from two enantiomer Schiff base derivatives, labeled as R-/ S-HL, in situ obtained from the condensation reactions with o-vanillin and R-/ S-2-phenylglycinol. The formulas of the series clusters are [MnLn(μ-OH)(μ-O)(Ac)(HO)( R-L)]·NO·OH (Ln = Dy (1R), Gd (2R)), [MnLn(μ-OH)(μ-O)(Ac)(HO)( S-L)]·NO·OH (Ln = Dy (1S), Gd (2S)), whose crystal structures and magnetic properties have been characterized. Structural analysis indicated that the above clusters consisted of a [MnLn] core, featuring a sandwich configuration. The results of magnetic measurements showed the presence of slow magnetic relaxation with the effective energy barrier of 14.85 K in two Dy derivatives under the condition of zero-dc field, while the significant magnetocaloric effect of Gd analogues was found in a wide temperature range.

Section: Resultssupporting

confidence: 81%

Nanosized Chiral [Mn₆Ln₂] Clusters Modeled by Enantiomeric Schiff Base Derivatives: Synthesis, Crystal Structures, and Magnetic Properties

Jiang

et al. 2018

Inorg. Chem.

“…Frontiers in Chemistry frontiersin.org mode, two NO 3 − anions and two H 2 O molecules located above and below the plane, respectively. The average bond lengths of Gd-O and Gd-N are 2.379 (5) Å and 2.460 ( 5) Å (Supplementary Table S1), respectively, which are in accordance with those of the reported Gd-based complexes (Chen et al, 1995;Zhao et al, 2017;Mayans and Escuer, 2021;Ren et al, 2021). In complex 1, the Gd ion is seven-coordinated to form a capped trigonal prism, which is confirmed by CShM calculations (Alvarez et al, 2005;Casanova et al, 2005) (Supplementary Figure S1, Supplementary Table S4).…”

Section: Methodssupporting

confidence: 88%

Three Gd-based magnetic refrigerant materials with high magnetic entropy: From di-nuclearity to hexa-nuclearity to octa-nuclearity

Sun²,

Gao³

et al. 2022

Front. Chem.

Self Cite

Magnetocaloric effect (MCE) is one of the most promising features of molecular-based magnetic materials. We reported three Gd-based magnetic refrigerant materials, namely, Gd2(L)(NO3)(H2O)‧CH3CN‧H2O (1, H2L = (Z)-N-[(1E)-(2-hydroxy-3-methphenyl)methylidene]pyrazine-2-carbohydrazonic acid), {Gd6(L)6(CO3)2(CH3OH)2(H2O)3Cl}Cl‧4CH3CN (2), and Gd8(L)8(CO3)4(H2O)8‧2H2O (3). Complex 1 contains two GdIII ions linked by two η2:η1:η1:η1:μ2-L2- ligands, which are seven-coordinated in a capped trigonal prism, and complex 2 possesses six GdIII ions, contributing to a triangular prism configuration. For complex 3, eight GdIII ions form a distorted cube arrangement. Moreover, the large values of magnetic entropy in the three complexes prove to be excellent candidates as cryogenic magnetic coolants.

“…In this case, the combination of 3 d and 4 f ions may be an effective strategy, because the intermediate magnetic exchange between 3 d ‐4 f ions may generate both a high‐spin state and magnetic anisotropy and improve the energy barrier U eff for spin reversal. Consequently, a lot of 3 d ‐4 f complexes showing SMM behaviors have been reported . The most attentions are focused on [Cu‐Ln], [Mn‐Ln] systems, and [Fe‐Ln] SMMs are less developed.…”

Section: Introductionsupporting

confidence: 57%

A Series of High‐nuclear 3d‐4f (Fe^III₈Ln^III₂) Complexes: Syntheses, Structures, and Magnetic Properties

Zhao

Bao

et al. 2019

Applied Organom Chemis

Self Cite

Six novel decanuclear clusters with formula of {[Fe 8 Ln 2 (O) 4 (OH) 4 (EtO) 2 (dhbp) 4 (dhbpH) 2 (piv) 6 ]·4EtOH} (Ln = Y (1), Gd (2), Tb (3), Dy (4), Ho (5), Er (6), dhbpH 2 = 6,6′-dihydroxyl-2,2′-bipyridine, Hpiv = pivalic acid, EtOH = ethanol) have been synthesized and characterized. Single-crystal and powder Xray diffraction analyses reveal that complexes 1-6 are isostructural and show a sandwich-like Fe III 8 Ln III 2 structure, in which the [Ln 2 ] unit is sandwiched by two planar [Fe 4 ] units. Magnetic properties of complexes 1-6 have been investigated and display dominant antiferromagnetic interactions, thereinto, complexes 4 and 6 display weak ferromagnetic behaviors associated with Ln III ions, while others are antiferromagnetic-like features. Furthermore, complex 4 (Fe III 8 Dy III 2 ) shows temperature/frequency-dependent ac signals with an energy barrier of 4.1 K, indicating that complex 4 should be a single-molecule magnet (SMM)