Insights into Magnetic Interactions in a Monodisperse Gd₁₂Fe₁₄ Metal Cluster

Abstract

The largest Ln-Fe metal cluster [Gd Fe (μ -OH) (μ -OH) (μ -O) (TEOA) (CH COO) (H O) ]⋅(CH COO) (CH CN) ⋅(H O) (1) and the core-shell monodisperse metal cluster of 1 a@SiO (1 a=[Gd Fe (μ -OH) (μ -OH) (μ -O) (TEOA) (CH COO) (H O) ] ) were prepared. Experimental and theoretical studies on the magnetic properties of 1 and 1 a@SiO reveal that encapsulation of one cluster into one silica nanosphere not only effectively decreases intermolecular magnetic interactions but also significantly increases the zero-field splitting effect of the outer layer Fe ions.

Assembly of a Wheel‐Like Eu24Ti8 Cluster under the Guidance of High‐Resolution Electrospray Ionization Mass Spectrometry

“…High‐resolution electrospray ionization mass spectrometry (HRESI‐MS) is a powerful tool to study the stability of the metal clusters in solution . Recently, HRESI‐MS was also used to investigate on the formation mechanism of the transition‐metal clusters .…”

Capturing Lacunary Iron–Oxo Keggin Clusters and Insight Into the Keggin‐Fe13 Cluster Rotational Isomerization

“…Owing to the fast ferric hydrolysis, it is difficult to capture differentsize of hydrated iron (III) species. In addition, although af ew Fe III trimers, tetramer,a nd larger polycations have been reported, [7][8][9][10][11] there is little consistency on the composition of the ferrihydrite phase. [12] As ar esult, the classic growth model of the ferrihydrite has not reached ab road consensus.…”

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

“…8 A good magnetic reagent should have a high-spin state, negligible magnetic anisotropy and weak magnetic exchange, 9,10 and 3d-Gd complexes are good candidates to achieve these goals. [11][12][13][14][15][16][17] The design and construction of such molecular magnetic refrigerants have made great progress, with examples including {Gd 2 }, 18 {Gd 24 }, 19 {Gd 38 }, 20 {Gd 48 }, 20 {Gd 60 }, 21 {Gd 104 }, 5 {Ni 2 Gd 2 }, 22 {Mn 4 Gd 6 }, 23 {Ni 6 Gd 6 }, 24 {Co 6 Gd 8 }, 25 {Co 4 Gd 10 }, 26 {Mo 4 Gd 12 }, 27 {Ni 21 Gd 20 }, 6 {Ni 12 Gd 36 }, 28 {Co 10 Gd 42 }, 29a {Ni 10 Gd 42 }, 29a {Ni 42 Gd 40 }, 30 {Ni 54 Gd 54 }, 31 {Ni 56 Gd 52 }, 32 {Ni 36 Gd 102 }, 33 {Ni 64 Gd 78 }, 34 {Ni 64 Gd 96 }, 35 and {Gd 30 Co 12 }. 29b Of the 3d-4f nanoclusters reported to date, {Gd 30 Co 12 } 29b has shown the highest −ΔS m of 44.7 J kg −1 K −1 at 7.0 T, and {Gd 20 Ni 21 } 6 the greatest low-field (ΔH = 1.0 T) magnetic entropy change (14.1 J kg −1 K −1 ).…”