Double-Propeller-like Heterometallic 3d–4f Clusters Ln₁₈Co₇

Abstract

OH) 14 (CO 3 ) 9 (CH 3 CH 2 COO) 6 (deaand Dy (2)) have been obtained by reacting CoCl 2 •6H 2 O, Ln(NO 3 ) 3 •6H 2 O, and a mixture of ligands consisting of propionate and diethanolamine (H 2 dea). Crystal structural analysis exhibits two three-blade propellers composed of the Co III 3 Ln 9 units connected by one Co II ion and three CO 3 2− ions, which assemble into a double-propeller-like structure (Ln 18 Co II Co III 6 ). Magnetocaloric effect (MCE) studies indicate that Gd 18 Co 7 exhibits a large entropy change (−ΔS m ) of 36.9 J kg −1 K −1 .

Magnetocaloric Effect in a Frustrated Gd-Garnet with No Long-Range Magnetic Order

“…23 In the latter series of compounds, only Ln = Tb displays a magnetic phase transition (at T = 3.6 K) while others seem to remain paramagnetic down to 2 K. It is important to also mention the magnetocaloric effect in rare earth metallic clusters, for example, in Ln 18 Co 7 . 25 The magnetic properties of Gd 3 CrGa 4 O 12 discussed in the present work have strong connections with the Gd spin clusters that form at low temperatures and certainly have a bearing on the magnetocaloric effect observed at 2 K.…”

Two SiO44–-Templated Ln23Ni20 Clusters with Magnetic Cooling and Stability

“…Extensive research studies have concentrated on the development of high-nuclearity metal aggregation during the past few decades because of their fascinating topological frameworks and numerous properties. − As an important part of metal nanoclusters, high-nuclearity transition–lanthanide (3d-4f) metal clusters have gained increasing attentions from various fields, owing to a variety of charming structures and interesting chemical and physical properties resulting from the interactions of mixed-metal ions. − Especially, due to the distinct magnetic exchange interactions, 3d-4f clusters play an important role in the magnetocaloric effect (MCE) and are regarded as the environmentally friendly magnetic cooling materials, such as Gd 20 Ni 21 , Gd 102 Ni 36 , Gd 54 Ni 54 , Gd 42 Co 10 , Gd 45 Co 7 , and Gd 95 Co 60 . − Although a large class of researchers tried their best to construct 3d-4f nanoclusters with a large MCE, it is still a big challenge to assemble high-nuclearity 3d-4f heterometallic clusters, which is caused by the sundry coordination modes of 3d and 4f metal ions and the insolubility originating from the overaggregation of metal ions. − …”

A new {Cu3–Gd2} cluster as a two-in-one functional material with unique topology acting as a refrigerant and adsorbent for cationic dye

“…[7][8][9] Recent research has proved the application of various heterometallic 3d/4f systems to show the SMM behaviour. [10][11][12] In the area of molecular magnetism, the combination of highly anisotropic lanthanide ions (e.g., Dy 3+ , Tb 3+ ) that exhibit unquenched orbital angular momenta and considerably significant spin with paramagnetic 3d-metal ions leads to the formation of SMMs possessing large energy barriers for the setback of magnetization. 13 However, in the absence of considerable magnetic anisotropy, high-spin molecules have resulted from the amalgamation of isotropic Gd 3+ ions with 3d-metal ions.…”