New lanthanide coordination polymers, (I) [Ln^III(Habtc)(H₂O)₂]·2H₂O (Ln = Sm^III, Eu^III, Gd^III, Tb^III, Dy^III, Ho^III, Er^III, and Tm^III), (II) [Ln^III(Habtc)(H₂O)₄]·3H₂O (Ln^III = Eu^III, Gd^III, Tb^III, Dy^III, Ho^III, Tm^III, and Yb^III), and (III) [Eu^III₂(Habtc)₂(H₂O)₆]·2.75H₂O (H₄abtc = 3,3′,5,5′-azobenzenetetracarboxylic acid), were designed and synthesized for use as catalysts. The framework structures, phase formation, and purity were characterized. The catalytic performances of [Eu^III(Habtc)(H₂O)₂]·2H₂O (Ib) and [Eu^III(Habtc)(H₂O)₄]·3H₂O (IIb) were evaluated based on CO₂ cycloaddition with epichlorohydrin under ambient CO₂ pressure and solvent-free conditions. Discussion has been made with respect to the multiple Lewis and Brønsted acidic and Lewis basic sites coresiding in the frameworks, which were revealed by single-crystal X-ray diffraction and measurements of acidity and basicity. Depending on the reaction conditions, excellent turnover numbers and turnover frequencies (2778 and 694 h^–1 for Ib and 2870 and 718 h^–1 for IIb) with ≥99% conversion and ≥87% selectivity could be achieved. The robustness of Ib and IIb over 10 cycles of catalysis and the makeup process was disclosed. The potential of Ib and IIb as promising catalysts for other epoxides was also examined.

中文翻译：

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通过设计在 CO ₂环加成反应中具有出色催化性能的镧系元素配位聚合物

新型镧系元素配位聚合物，( I ) [Ln ^III (Habtc)(H ₂ O) ₂ ]·2H ₂ O (Ln = Sm ^III , Eu ^III , Gd ^III , Tb ^III , Dy ^III , Ho ^III , Er ^III , and Tm ^III ), ( II ) [Ln ^III (Habtc)(H ₂ O) ₄ ]·3H ₂ O (Ln ^III = Eu ^III , Gd ^III , Tb ^III , Dy ^III , Ho ^III , Tm^III，和 Yb ^III )，和 ( III ) [Eu ^III ₂ (Habtc) ₂ (H ₂ O) ₆ ]·2.75H ₂ O (H ₄ abtc = 3,3',5,5'-偶氮苯四甲酸)，被设计和合成用作催化剂。表征了骨架结构、相形成和纯度。[Eu ^III (Habtc)(H ₂ O) ₂ ]·2H ₂ O ( Ib )和[Eu ^III (Habtc)(H ₂ O) ₄ ]·3H ₂ O ( IIb )的催化性能)基于在环境CO ₂压力和无溶剂条件下与环氧氯丙烷的CO ₂环加成进行评估。已经对框架中的多个 Lewis 和 Brønsted 酸性和 Lewis 碱性位点进行了讨论，这些位点是通过单晶 X 射线衍射和酸度和碱度的测量揭示的。根据不同的反应条件下，优异的转换数和周转频率（2778和694ħ ^-1为磅和2870和718ħ ^-1为IIB）与≥99％的转化率和≥87％的选择性可以达到。Ib和IIb的稳健性公开了超过 10 个催化循环和组成过程。还研究了Ib和IIb作为其他环氧化物有希望的催化剂的潜力。