Abstract Two 4f and 3d-4f complexes [Yb3L3(OAc)3] (1) and [Zn2NdL2(OAc)3] (2) were constructed from Schiff base ligand N,N′-bis(3-methoxysalicylidene)(4-methylphenylene)-1,2-diamine (H2L). 1 shows a chiral “triple-decker” structure with Yb3+ ions sandwiched between the alternating layers of Schiff base ligands, while 2 exhibits a “cross” structure with the Nd3+ ion clipped by two ZnL groups. Open 3D channel structures running along the a-axis are formed in the solid state of 1 and 2. Excited by ligand-centered absorption bands, 1 and 2 show typical NIR emission of Yb3+ and Nd3+, respectively. Interestingly, 2 exhibits lanthanide luminescent response towards anions, especially to CN− and OAc− at ppm level.

中文翻译：

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两种镧系元素席夫碱配合物的构建：手性“三层”结构和对阴离子的近红外发光响应

摘要 以席夫碱配体 N,N'-双(3-甲氧基水杨烯)(4-甲基亚苯基)为原料构建了两个 4f 和 3d-4f 配合物 [Yb3L3(OAc)3] (1) 和 [Zn2NdL2(OAc)3] (2) )-1,2-二胺 (H2L)。图 1 显示了手性“三层”结构，Yb3+ 离子夹在席夫碱配体的交替层之间，而图 2 显示了“交叉”结构，其中 Nd3+ 离子被两个 ZnL 基团夹住。沿 a 轴运行的开放 3D 通道结构在 1 和 2 的固态下形成。受以配体为中心的吸收带激发，1 和 2 分别显示 Yb3+ 和 Nd3+ 的典型 NIR 发射。有趣的是，2 对阴离子表现出镧系元素发光响应，特别是对 ppm 水平的 CN- 和 OAc-。