A series of new octanuclear Ln₈ clusters: magnetic studies reveal a significant cryogenic magnetocaloric effect and slow magnetic relaxation

Abstract

A series of new octanuclear Ln8 clusters. Magnetically, Gd8 exhibited a significant magnetocaloric effect and a magnetic entropy change is 32.49 J K−1 kg−1 for a field of 7 T at 2 K, while Dy8 exhibited a frequency dependent slow relaxation of magnetization at a zero applied direct current magnetic field.

Self-assembly of octanuclear Ln(iii)-based clusters: their large magnetocaloric effects and highly efficient conversion of CO2

“…46–48 It is worth mentioning that the maximal −Δ S m value of 1 is much larger than that of most previously known polynuclear Gd n ( n > 6) clusters (see Table 2). 23,32–36,49–56…”

“…[46][47][48] It is worth mentioning that the maximal −ΔS m value of 1 is much larger than that of most previously known polynuclear Gd n ( n > 6) clusters (see Table 2). 23,[32][33][34][35][36][49][50][51][52][53][54][55][56] To probe the dynamic magnetic properties of clusters 2 and 3, variable-temperature alternating current (ac) magnetic susceptibility measurements are carried out under an applied oscillating field of 3.0 Oe (see Fig. 5 and Fig.…”

Metal–Organic Frameworks Based on Group 3 and 4 Metals

“…Polynuclear Ln 3+ clusters attract increasing attention, as a result of their intriguing geometrical features and interesting properties related to magnetic, quantum computing and luminescent applications. The reported Ln 3+ clusters mainly include trinuclear (Ln 3 , Ln = Gd, Tb, Dy, Ho), [ 16,17 ] tetranuclear (Ln 4 , Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb), [ 18–27 ] pentanuclear (Ln 5 , Ln = Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb), [ 25 ] hexanuclear (Ln 6 , Ln = Pr, Ce, Eu, Gd, Tb, Dy, Er and Y), [ 27–30 ] octagon (Ln 8 , Ln = Gd, Tb, Dy, Ho), [ 31 ] nine‐nuclear (Ln 9 , Ln = Nd, Sm, Eu, Gd, Tb, Dy, Ho), [ 32–34 ] eleven‐nuclear (Ln 11 , Ln = Gd, Tb, Dy), [ 35 ] dodecanuclear (Ln 12 , Ln = Eu, Gd, Tb, Dy), [ 32,36–38 ] hexadecanuclear (Ln 16 , Ln = Gd, Dy) clusters. [ 39 ] The number of Ln nuclei in Ln 3+ clusters was often controlled by the preferred coordination geometry of ligands [ 32 ] and the reaction environments.…”

Solid state structures and solution behaviour of tetranuclear lanthanide(iii) carbonate-bridged coordination compounds of chiral 3 + 3 amine macrocycle

“…Due to the variety of possible binding modes (end-on κ 2 and bridging coordination modes μ 2 –η 1 :η 1 , μ 2 –κ 2 :κ 2 , μ 3 –κ 2 :κ 2 :κ 2 , μ 3 –κ 2 :η 1 :η 1 , μ 3 –κ 2 :κ 2 :η 1 , μ 6 –η 1 :η 1 :η 1 :η 1 :η 1 :η 1 or μ 6 –κ 2 :η 1 :η 1 :η 1 :η 1 :η 1 ) this ligand can bridge up to six Ln III ions and form supramolecular assemblies of interesting geometries. 26 These complexes attract attention not only due to their interesting structures but also appealing magnetic, 27–49 (chiro)optical 48–53 or catalytic properties. 54,55 In most cases, the carbonate-bridged polynuclear Ln III complexes are obtained accidentally by fixation of atmospheric carbon dioxide.…”