Four isostructural lanthanide coordination polymers with a phenylacetate (PAA⁻) ligand, [Ln(PAA)₃(H₂O)]_n (Ln = Eu (1); Gd (2); Tb (3); Dy (4)), were synthesized under hydrothermal conditions. Complexes 1–4 display a one-dimensional (1D) wave chain structure bridged by the carboxylate of the PAA⁻ ligand, which was generated via the in situ decarboxylation of phenylmalonic acid. Magnetic studies suggest the presence of ferromagnetic Ln⋯Ln coupling in the 1D chain of 1–4. Meanwhile, 2 has a significant cryogenic magnetocaloric effect with the maximum −ΔS_m of 26.73 at 3 K and 7 T, and 3 and 4 show interesting spin-glass behavior, which is rarely reported for Ln-containing complexes. Additionally, the solid-state photophysical properties of 1 and 3 display strong characteristic Eu³⁺ and Tb³⁺ photoluminescence emission in the visible region, indicating that Eu- and Tb-based luminescence are sensitized by the effective energy transfer from the ligand to the metal centers.

中文翻译：

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四种一维镧系元素-苯基乙酸酯聚合物，具有发光和磁性冷却/自旋玻璃行为

用苯乙酸四个同构镧系元素配位聚合物（PAA ^- ）配体，[LN（PAA）₃（H ₂ O）] _Ñ（Ln为铕（1）;钆（2）;铽（3）;镝（4））在水热条件下合成。配合物1-4显示的一维（1D）波链结构桥接由PAA的羧酸^-配体，其产生通过所述原位苯基丙二酸脱羧。磁性研究表明在1–4的一维链中存在铁磁性Ln⋯Ln耦合。同时，2具有与最大-Δ一个显著低温磁热效应小号_米在3 K和7 T，和26.73 3和4示出了有趣的自旋玻璃的行为，这是很少含有LN-络合物的报道。此外，1和3的固态光物理性质在可见光区域显示出很强的Eu ³⁺和Tb ³⁺光致发光特性，表明基于Eu和Tb的发光被从配体到金属的有效能量转移所敏化。金属中心。