A new family of interdimer [Mn^II₂Ln^III₂]₂ clusters: Syntheses, structures, and magnetic properties

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• 作者：Lei Sun^a ; ^b ; Hui Chen^a ; Chengbing Ma^a ; Changneng Chen^a ; ^{ccn@fjirsm.ac.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Mn/Ln clusters ; Magnetic caloric effect ; Single molecule magnets
• 刊名：Inorganic Chemistry Communications
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：70
• 期：Complete
• 页码：132-135
• 全文大小：838 K

文摘

A new family of isostructural Mn/Ln clusters: [Mn^II₂Ln^III₂(hmp)₆(NO₃)₄(CH₃OH)₂][Mn^II₂Ln^III₂(hmp)₆(NO₃)₄(H₂O)₂] ([Ln = Gd (1), Tb(2), Dy(3), hmpH = 2-(hydroxymethyl)pyridine]) have been synthesized by the reaction of Mn(NO₃)₂ and Ln(NO₃)₃·6H₂O with hmpH as ligand under solvothermal conditions. Compounds 1–3 are isostructural and possess butterfly core. That the antiferromagnetic interactions within compounds 1–3 were suggested by soild-state dc magnetic susceptibility analyses. Compound 1 displays a magnetic-caloric effect (MCE) with 21.91 J Kg^− 1 K^− 1 of the entropy change at 5 K for ΔH = 8 T. Compounds 2 and 3 exhibit frequency-dependent ac susceptibility signals suggestive of slow magnetic relaxation.