Ln2Ga[B3O6(OH)]2[B7O9(OH)2](CH3CO2)2 (Ln = Y, Sm, Eu, Gd, Dy): A Series of Lanthanide Galloborates Decorated by Acetate Anions

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• 作者：Hui Yang ; Chun-Li Hu ; Jiang-Gao Mao
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：June 20, 2016
• 年：2016
• 卷：55
• 期：12
• 页码：6051-6060
• 全文大小：675K
• 年卷期：0
• ISSN：1520-510X

文摘

The first examples of mixed-anion lanthanide galloborates, namely, Ln₂Ga[B₃O₆(OH)]₂[B₇O₉(OH)₂](CH₃CO₂)₂ [Ln = Y (1), Sm (2), Eu (3), Gd (4), Dy (5)], have been obtained through hydrothermal synthesis. The title compounds are isomorphic and belong to monoclinic space group C2/c (No. 15). Their structures possess [B₇O₁₃(OH)₂] borate layers further bridged with [B₃O₇] clusters to give a three-dimensional (3D) borate framework displaying two types of rhombus-like B₁₄O₁₄ 14-membered-ring (14-MR) channels along the b axis. The Ga³⁺ ions are octahedrally coordinated and located at one end of the B₁₄O₁₄ 14-MR channels, forming small tunnels of B₇Ga 8-MRs, which are filled by the Ln^III ions. The Ln ions and Ga cations are further held together by bridging acetate anions. It is worth noting that in these compounds there are two different types of borate clusters and two types of anions that are uncommon in the borates reported. Luminescent studies revealed the characteristic emission bands of Ln ions for compounds 2–5, and the luminescent lifetimes are 3.6, 0.86, and 3.05 ns for compounds 2, 3, and 5, respectively. Magnetic measurements suggest that there are antiferromagnetic interactions between magnetic centers for compounds 2–5.