Two di- and trinuclear Gd(III) clusters derived from monocarboxylates exhibiting significant magnetic entropy changes

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• 作者：Sui-Jun Liu^a ; ^{liusuijun147@163.com} ; Shu-Li Yao^a ; Chen Cao^a ; Teng-Fei Zheng^a ; Cao Liu^a ; Zheng-Xiang Wang^a ; Qiang Zhao^b ; ^{zhaoqiang0522@126.com} ; Jin-Sheng Liao^a ; Jing-Lin Chen^a ; He-Rui Wen^a ; ^{wenherui63@163.com}
• 关键词：Gd(III) clusters ; Crystal structures ; Monocarboxylate ligands ; Magnetic entropy changes ; Magnetorefrigerant
• 刊名：Polyhedron
• 出版年：2017
• 出版时间：10 January 2017
• 年：2017
• 卷：121
• 期：Complete
• 页码：180-184
• 全文大小：1399 K
• 卷排序：121

文摘

Two di- and trinuclear Gd(III) clusters with the formulas {[Gd2(omba)6(phen)2]·2H2O} (1) and [Gd3(Hsa)5(sa)2(phen)3] (2) (Homba = o-methoxybenzoic acid, H2sa = salicylic acid and phen = 1,10-phenanthroline) have been prepared through the hydrothermal reactions. Complex 1 takes a dinuclear structure and two Gd(III) are bridged by two syn-syn-μ2-η1:η1 and two syn-syn-μ2-η1:η2 carboxylates. While complex 2 is a trinuclear cluster linked by one syn-syn-μ2-η1:η2 and two syn-syn-μ2-η1:η1 carboxylates. Magnetic studies reveal the key impact of magnetic density on the magnetocaloric effect in Gd(III) systems. They exhibit relatively weak magnetic interactions and significant magnetic entropy changes with −ΔSmmax = 17.1 J kg−1 K−1 and 22.5 J kg−1 K−1 (T = 2 K, ΔH = 7 T), respectively.