Two novel tetranuclear Yb(iii)-based compounds for highly efficient conversion of CO2 to cyclic carbonates†

IF 2.6 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

CrystEngComm Pub Date : 2025-02-08 DOI:10.1039/D4CE00662C

Yining Sun, Guoguo Liu, Gang Xiong and Guangwen Xu

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Abstract

Two new tetranuclear Ln(III)-based compounds were formulated, namely, [Yb₄(μ₃-O)₂(dbm)₄(L1)₆]·2CH₂Cl₂·6CH₃CN (1) and [Yb₄(μ₃-O)₂(dbm)₄(L2)₆] (2) (Hdbm = dibenzoylmethane, HL1 = (E)-5-((4-methoxybenzylidene)amino)quinolin-8-ol, and HL2 = (E)-5-(benzylideneamino)quinolin-8-ol), using two 8-hydroxyquinoline Schiff bases (HL1 and HL2) under solvothermal conditions. The single-crystal structures and catalytic properties of the two Yb₄ compounds (1 and 2) were comprehensively studied. Single-crystal X-ray diffraction analysis showed that both Yb₄ compounds (1 and 2) possessed a rhombic Yb₄ core and showed butterfly-shaped structures. Both tetranuclear Yb(III)-based compounds displayed typical near-infrared luminescence of Yb³⁺ ions at room temperature. Catalytic study indicates that the two Yb₄ compounds are heterogeneous catalysts that can catalyze the cycloaddition of CO₂ with epoxides and offer high yield under mild conditions (TBAB as the co-catalyst, T = 70 °C, P = 0.1 MPa and solvent-free).

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两种新型四核Yb（iii）基化合物，可将CO2高效转化为环状碳酸盐†

利用两种8-羟基喹啉希夫碱（HL1和HL2），在溶剂热条件下合成了两个新的四核Ln（III）基化合物[Yb4(μ3-O)2(dbm)4(L1)6]·2CH2Cl2·6CH3CN(1)和[Yb4(μ3-O)2(dbm)4(L2)6] (2) (Hdbm =二苯甲酰甲烷，HL1 = (E)-5-（（4-甲氧基苄基苄基）氨基）喹啉-8-醇，HL2 = （E)-5-（苄基氨基）喹啉-8-醇）。对Yb4化合物（1和2）的单晶结构和催化性能进行了全面研究。单晶x射线衍射分析表明，Yb4化合物（1和2）均具有菱形Yb4核，呈蝴蝶状结构。两种四核Yb（III）基化合物在室温下均表现出典型的Yb3+离子近红外发光。催化研究表明，两种Yb4化合物均为多相催化剂，在温和条件下（TBAB为助催化剂，T = 70℃，P = 0.1 MPa，无溶剂），可催化CO2与环氧化物的环加成反应，产率高。

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