Unique (3,12)-connected coordination polymers displaying high stability, large magnetocaloric effect and slow magnetic relaxation

Abstract

Two unique 3D coordination polymers based on octahedral [Ln6] (Ln = Gd (), Dy ()) clusters as nodes were synthesized, exhibiting a novel (3,12)-connected topology with the symbol of (4(20)·6(26)·8(20))(4(3))4. The magnetic studies reveal that shows a -ΔSm = 46.6 J kg(-1) K(-1), falling among the largest values known to date, and displays slow magnetic relaxation behavior. Both and have high thermal and solvent stabilities.

Low‐Dimensional Carboxylate‐Bridged GdIII Complexes for Magnetic Refrigeration

“…In addition, the M w /N Gd ratio of complex [Gd 6 ] 1 is the lowest in Table 1; however, it does not have the largest MCE, owing to the second-strongest AF coupling. [18] Notably, 4 ]·3 H 2 O} 1 exhibits a much smaller MCE (Table 1), although its M w /N Gd ratio is small, which could be explained by the fact that the magnetic interaction between Gd III ions (q) is relatively large in this complex. [6a] Based on the above discussion, we can safely assume that a Gd III complex with a low M w /N Gd ratio (or high magnetic density) and weak interactions (especially for weak F interaction) between the Gd III ions give a large MCE and afford great potential in magnetic refrigeration.…”

A brilliant cryogenic magnetic coolant: magnetic and magnetocaloric study of ferromagnetically coupled GdF3

“…[38][39][40][41][42] Since there is little room for the organic ligands to keep shrinking, the most recent focus in this field dramatically returned to the inorganic compounds based on small counterions such as OH -, SO 4 2-, O 2-. [43][44][45] Following the strategies learned in molecular systems, 30-35 significant enhancement of MCE in these inorganic compounds have been observed, and the orthorhombic Gd(OH)CO 3 finally surpass the performance of GGG and set a new record. 46 However, the story seems not over yet as a better example of GdPO 4 was reported just after half a year.…”

Group 3 Elements and Lanthanide Metals

“…Ferromagnetic and antiferromagnetic interactions [91,92,107,[161][162][163] were reported in addition to the single-ion paramagnetic behavior and typically refer to the respective lanthanide ions. The series of Ln-MOFs {[Ln 2 (Hpimda) 2 ( 4 -C 2 O 4 )⋅2H 2 O]⋅4H 2 O} n (Hpimda = 2-propyl-1H-imidazole-4,5-dicarboxylate) is a prominent example, showing weak ferromagnetic ordering for Tb, Dy, and Ho as well as antiferromagnetic coupling for Er [91].…”