Abstract An exploration of reactions of 1,1′,1″-(benzene-1,3,5-triyltris(methylene))tris(4-carboxypyridinium)-tribromide (H3LBr3) with LnIII salts has led to the formation of three complexes, {[LnL(H2O)2]·3(NO3)·6H2O} (Ln = Eu (1), Gd (2), and Tb (3)). Single-crystal X-ray analyses revealed that these complexes are isomorphous and have 3-D, channel-like structures, in which the carboxylic acids are fully deprotonated with syn–syn μ2-η1:η1 type bridging modes and L ligands in a chair-shaped configuration. Both 1 and 3 showed strong luminescence upon excitation. Magnetic measurements were performed for 2 and 3. The magnetic studies show that very weak antiferromagnetic couplings exist between GdIII and GdIII in 2. Moreover, powder X-ray diffraction, infrared spectroscopy, and elemental analysis were also performed.

中文翻译：

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三种基于 1,1',1''-(benzo-1,3,5-triyltris(methylene))tris(4-carboxypyridinium)tribromide 的 LnIII 配位化合物：合成、结构和性质

摘要 对 1,1',1"-(benzo-1,3,5-triyltris(methylene))tris(4-carboxypyridinium)-tribromide (H3LBr3) 与 LnIII 盐反应的探索导致了三种配合物的形成。 , {[LnL(H2O)2]·3(NO3)·6H2O}（Ln = Eu (1)、Gd (2) 和 Tb (3)）。单晶 X 射线分析表明，这些配合物是同晶的，具有 3-D 通道状结构，其中羧酸完全去质子化，具有 syn–syn μ2-η1:η1 型桥接模式和椅子中的 L 配体形配置。1 和 3 在激发时都显示出强烈的发光。对 2 和 3 进行了磁性测量。磁性研究表明，2 中的 GdIII 和 GdIII 之间存在非常弱的反铁磁耦合。此外，还进行了粉末 X 射线衍射、红外光谱和元素分析。