Large Magnetocaloric Effect in a Dense and Stable Inorganic-Organic Hybrid Cobridged by In Situ Generated Sulfate and Oxalate

Efficiently increasing low-field magnetic entropy by incorporating SO32− into Gd22Ni21 clusters

One distinct nanosized cluster, Gd22Ni21, was isolated by the mixed-anion-templates (SO32- and SO42-), which was firstly reported in 3d-4f metal clusters. Additionally, Gd22Ni21 shows the largest low-field magnetic entropy change...

Gd(III)-based metal-organic frameworks and coordination polymers for magnetic refrigeration

As the alternatives of expensive and increasingly shortage 3He for ultralow-temperaturerefrigeration, molecule-based magnetorefrigerant materials have attracted much attention in the past decades. Among them, Gd(III)-based metal-organic frameworks and coordination polymers...

Recent advances in lanthanide coordination polymers and clusters with magnetocaloric effect or single-molecule magnet behavior

Molecular magnetorefrigerant materials for low-temperature magnetic refrigeration and single-molecule magnets for high-density information storage and quantum computing have received extensive attention from chemists and magnetic experts. Lanthanide ions with unique magnetic properties have always been considered as ideal candidates for the construction of such materials. This frontier article focuses on Gd^III-based molecular magnetorefrigerants and lanthanide-based single-molecule magnets and highlights the most significant advances.

Single-Crystal-to-Single-Crystal Installation of Ln4 (OH)4 Cubanes in an Anionic Metallosupramolecular Framework

Postsynthetic installation of lanthanide cubanes into a metallosupramolecular framework via a single-crystal-to-single-crystal (SCSC) transformation is presented. Soaking single crystals of K₆ [Rh₄ Zn₄ O(l-cys)₁₂ ] (K₆ [1]; l-H₂ cys=l-cysteine) in a water/ethanol solution containing Ln(OAc)₃ (Ln³⁺ =lanthanide ion) results in the exchange of K⁺ by Ln³⁺ with retention of the single crystallinity, producing Ln₂ [1] (2_Ln ) and Ln_0.33 [Ln₄ (OH)₄ (OAc)₃ (H₂ O)₇ ][1] (3_Ln ) for early and late lanthanides, respectively. While the Ln³⁺ ions in 2_Ln exist as disordered aqua species, those in 3_Ln form ordered hydroxide-bridged cubane clusters that connect [1]^6- anions in a 3D metal-organic framework through coordination bonds with carboxylate groups. This study shows the utility of an anionic metallosupramolecular framework with carboxylate groups for the creation of a series of metal cubanes that have great potential for various applications, such as magnetic materials and heterogeneous catalysts.

3D isomorphous lanthanide coordination polymers displaying magnetic refrigeration, slow magnetic relaxation and tunable proton conduction

Four lanthanide 3D coordination frameworks with 1D hydrophilic channels along the crystallographic c direction have been investigated for their proton conduction and magnetic properties.

Two hybrid lanthanide complexes exhibiting a large magnetocaloric effect and slow magnetic relaxation

Two isostructural lanthanide (Ln) hybrid complexes co-bridged by organic oxalate and inorganic hypophosphite, [Ln(oxa)(H₂PO₂)(H₂O)₂] (oxa = oxalate; Ln = Gd (1), Dy (2)), were solvothermally prepared with the goal of elucidating the role of a hybrid framework in the generation of novel molecular magnetic materials. The title compounds feature a two dimensional (2D) hybrid layer. The Ln^III ions are octa-coordinated with distorted square antiprism geometry. The adjacent Ln^III ions are co-bridged by hypophosphite and one type of oxalate ligand to form 1D hybrid chains, which are further linked by a second type of oxalate ligand to generate the resulting 2D framework. Magnetic investigations reveal that compound 1 features a large magnetocaloric effect with -ΔS = 46.60 J kg^-1 K^-1 (134.39 mJ cm^-3 K^-1), due to the combined advantages of organic oxalate and inorganic hypophosphite ligands, while compound 2 displays slow magnetic relaxation.

Large magnetic entropy changes in three GdIIIcoordination polymers containing GdIIIchains

Three chain-based Gd^IIIcomplexes based on three types of multidentate O ligands have been successfully constructedviahydro/solvothermal reactions. They exhibit good thermal stabilities and large magnetic entropy changes.

Temperature- and vapor-induced reversible single-crystal-to-single-crystal transformations of three 2D/3D GdIII–organic frameworks exhibiting significant magnetocaloric effects

Reversible SCSC transformations of three Gd^III MOFs derived from two dicarboxylates have been successfully realized and they exhibit significant MCEs.

A family of one-dimensional lanthanide complexes bridged by two distinct carboxylate ligands with the Dy analogue displaying magnetic relaxation behaviour

Utilizing two different carboxylate ligands to construct dysprosium SMMs with relatively good performance was proven to be a successful synthetic strategy.

Coordination-Cluster-Based Molecular Magnetic Refrigerants

Coordination polymers serving as molecular magnetic refrigerants have been attracting great interest. In particular, coordination cluster compounds that demonstrate their apparent advantages on cryogenic magnetic refrigerants have attracted more attention in the last five years. Herein, we mainly focus on depicting aspects of syntheses, structures, and magnetothermal properties of coordination clusters that serve as magnetic refrigerants on account of the magnetocaloric effect. The documented molecular magnetic refrigerants are classified into two primary categories according to the types of metal centers, namely, homo- and heterometallic clusters. Every section is further divided into several subgroups based on the metal nuclearity and their dimensionalities, including discrete molecular clusters and those with extended structures constructed from molecular clusters. The objective is to present a rough overview of recent progress in coordination-cluster-based molecular magnetic refrigerants and provide a tutorial for researchers who are interested in the field.

Tricarboxylate-based GdIII coordination polymers exhibiting large magnetocaloric effects

Hydrothermal reactions of Gd₂O₃ and two tricarboxylates generated two carboxylate-bridged 2D/3D Gd^III coordination polymers with large magnetocaloric effects.

Mixed-anion templated cage-like lanthanide clusters: Gd27 and Dy27

Two record-large odd-numbered Ln₂₇ lanthanide clusters, each one featuring one CO₃²⁻ and eight ClO₄⁻ groups as mixed anion templates, were obtained by controlling the hydrolysis of the Ln³⁺ ions in the presence of simple propionate ligands.

Two nanosized 3d–4f clusters featuring four Ln6 octahedra encapsulating a Zn4 tetrahedron

Two high-nuclearity 3d–4f clusters Ln₂₄Zn₄ (Ln = Gd and Sm) featuring four Ln₆ octahedra encapsulating a Zn₄ tetrahedron were obtained through the self-assembly of Zn(OAc)₂ and Ln(ClO₄)₃.

Two GdIII complexes derived from dicarboxylate ligands as cryogenic magnetorefrigerants

Two Gd^III complexes with 1D/3D structures exhibit weak magnetic interactions and large magnetocaloric effects (−ΔSmaxm > 37.0 J kg⁻¹ K⁻¹).