A new family of boat-shaped Ln 8 clusters exhibiting the magnetocaloric effect and slow magnetic relaxation.

Authors :: Li JN
Li NF
Wang JL
Liu XM
Ping QD
Zang TT
Mei H
Xu Y
Source :: Dalton transactions (Cambridge, England : 2003) [Dalton Trans] 2021 Oct 12; Vol. 50 (39), pp. 13925-13931. Date of Electronic Publication: 2021 Oct 12.
Publication Year :: 2021
Abstract: Designing and synthesizing lanthanide clusters have always been a research hotspot. Herein, three lanthanide clusters with the formula [Ln <subscript>8</subscript> (IN) <subscript>14</subscript> (μ <subscript>3</subscript> -OH) <subscript>8</subscript> (μ <subscript>2</subscript> -OH) <subscript>2</subscript> (H <subscript>2</subscript> O) <subscript>8</subscript> ]· x H <subscript>2</subscript> O (Ln = 1-Gd and x = 11; Ln = 2-Dy and x = 8; Ln = 3-Eu and x = 8) have been isolated in the presence of isonicotinic acid under solvothermal conditions. Structural analysis indicates that those three compounds are isostructural, featuring boat-shaped {Ln <subscript>8</subscript> } metal frameworks. Magnetic measurements reveal that 1-Gd exhibits a larger MCE with the maximum -Δ S <subscript>m</subscript> value of 31.77 J kg <superscript>-1</superscript> K <superscript>-1</superscript> at 2 K for Δ H = 7 T, while 2-Dy displays slow magnetization relaxation. Besides, the photoluminescence properties of 3-Eu were investigated.

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