Modulating the relaxation dynamics via structural transition from a dinuclear dysprosium cluster to a nonanuclear cluster

Abstract

Along with the transition from a dinuclear dysprosium cluster to a nonanuclear one, the variable magnetic relaxation with the energy barrier changing from 217.87 K to 9.24 K had been...

Construction of a High Nuclear Gadolinium Cluster with Enhanced Magnetocaloric Effect through Structural Transition

“…The Gd–O bond lengths are in the range of 2.294(1)–2.654(1) Å, in agreement with the related distances of other similar Gd clusters. 27 − 29 On comparing the structural analysis of 2 with 1 , the more deprotonated bridging ligands and μ 4 - and μ 3 -hydroxyl groups introduced into the reaction system by enlarging the amount of the ligand and base could substitute for the weakly coordinated water molecule and chelating NO 3 – anions in compound 1 , further coordinating more metal ions and generating a higher nuclearity cluster. Similar behaviors have also been discovered in the previously reported work.…”

“…Generally speaking, high magnetic density, which guarantees the large metal/ligand mass ratio, is favorable to enhance the MCE. In this sense, a successful approach that has been proposed to obtain the larger MCE is to construct Gd III ions with light and multidentate organic or inorganic ligands. − Accordingly, a number of Gd-clusters and coordination polymers with various structures have been constructed and investigated, and the maximum value of −Δ S m has been continuously exceeded. − Nonanuclear Ln-clusters, especially those with a sandglass topology, were attractively synthesized, but the MCE of Gd complexes was usually neglected. − Admittedly, it remains a challenge for researchers to availably design and synthesize the limited high nuclearity Gd-clusters that afford interesting structural features and high MCE because of several challenges in synthesizing this type of clusters, such as the coordination modes of the ligands, anion templates, the ratio of raw materials, the pH value, solvents, as well as the temperature. Furthermore, apart from high magnetic density, the large MCE of Gd-clusters is also dependent upon weak magnetic couplings between the metal ions.…”

“… 11 − 24 Nonanuclear Ln-clusters, especially those with a sandglass topology, were attractively synthesized, but the MCE of Gd complexes was usually neglected. 25 − 29 Admittedly, it remains a challenge for researchers to availably design and synthesize the limited high nuclearity Gd-clusters that afford interesting structural features and high MCE because of several challenges in synthesizing this type of clusters, such as the coordination modes of the ligands, anion templates, the ratio of raw materials, the pH value, solvents, as well as the temperature. Furthermore, apart from high magnetic density, the large MCE of Gd-clusters is also dependent upon weak magnetic couplings between the metal ions.…”

Synthesis, structures and magnetic properties of four dysprosium-based complexes with a multidentate ligand with steric constraint

“…[30][31][32] To solve these problems, it is essential to set up a systematic study to explore the relationship between the structural features and magnetic dynamics. 33 It is well known that ligand fields are as important as coordination geometries for lanthanide ions, which is the key factor for constructing high-performance SMMs. Thus, in order to build the desired Dy(III) SMMs, it is particularly important to choose appropriate ligands with the optimum ligand field.…”

“…30–32 To solve these problems, it is essential to set up a systematic study to explore the relationship between the structural features and magnetic dynamics. 33…”