Synthesis, structures and magnetocaloric properties of two dinuclear Gd^III clusters derived from monocarboxylate ligands

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• 作者：Teng-Fei Zheng^a ; Chen Cao^a ; Piao-Ping Dong^a ; Sui-Jun Liu^a ; ^{liusuijun147@163.com" class="auth_mail" title="E-mail the corresponding author} ; Feng-Feng Wang^b ; ^{wangff666@126.com" class="auth_mail" title="E-mail the corresponding author} ; Xiao-Lan Tong^c ; Jin-Sheng Liao^a ; Jing-Lin Chen^a ; He-Rui Wen^a ; ^{wenherui63@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：GdIII clusters ; Hydrothermal conditions ; Magnetic refrigeration ; Magnetocaloric effect ; Crystal structures
• 刊名：Polyhedron
• 出版年：2016
• 出版时间：27 July 2016
• 年：2016
• 卷：113
• 期：Complete
• 页码：96-101
• 全文大小：1824 K

文摘

Two dinuclear Gd^III clusters, namely [Gd₂(piv)₆(phen)₂] (class="boldFont">1) and {[Gd₂(2-TCA)₆(phen)₂]·2H₂O} (class="boldFont">2) (Hpiv = pivalic acid, 2-TCA = Thiophene-2-carboxylic acid and phen = 1,10-phenanthroline), have been synthesized under hydrothermal conditions. Complex class="boldFont">1 features dinuclear structure with two syn-syn-μ₂-η¹:η¹ carboxylates bridging, while class="boldFont">2 exhibits dinuclear structure bridged by four carboxylates with syn-syn-μ₂-η¹:η¹ and syn-syn-μ₂-η¹:η² modes. Magnetic studies indicate that weak antiferromagnetic interactions between adjacent Gd^III ions exist in class="boldFont">1 and class="boldFont">2. They exhibit relatively large magnetocaloric effects with −ΔS_m^max = 19.1 J kg⁻¹ K⁻¹ and 21.8 J kg⁻¹ K⁻¹ for ΔH = 70 kOe, respectively, influenced by relatively high magnetic density and weak magnetic interaction.