Multinuclear Pr-containing antimonotungstate [Pr₄(H₂O)₁₀W₆O₁₃(mal)₂(OAc)(B-α-SbW₉O₃₃)₄]^21– (Pr-1, mal = malate anion, OAc = acetate anion), bridged by organic carboxylic acid, was synthesized through a one-pot assembly reaction and structurally characterized. Pr-1 is composed of four [B-α-SbW₉O₃₃]^9– fragments fused together by an organic–inorganic hybrid central [Pr₄(H₂O)₁₀W₆O₁₃(mal)₂(OAc)]¹⁵⁺ cluster core through 24 μ₂-O atoms. Notably, the central cluster comprises unprecedented decanuclear Pr₄(H₂O)₁₀W₆O₁₃ jointly decorated by two types of carboxylic acid ligands. This integration of rare earth-containing antimonotungstate with mixed organic carboxylate ligands is very rare in POMs chemistry. Pr-1 exhibits excellent catalytic activity in the cyclo-condensation reaction involving benzil, aldehyde, and NH₄OAc. A series of 2,4,5-trisubstituted imidazoles were synthesized in remarkable yields using ⁱPrOH as a green solvent.

中文翻译：

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桥接 Tetra-Pr3+ 封装的抗单钨酸盐的混合羧酸盐配体：咪唑合成的合成、结构和催化活性


含多核 Pr 的抗钨酸酯 [Pr₄（H₂O）₁₀W₆O₁₃（mal）₂（OAc）（B-α-SbW ₉O₃₃）₄]^21– （Pr-1，mal = 苹果酸阴离子，OAc = 乙酸阴离子），由有机羧酸桥接，通过一锅组装反应合成并进行结构表征。Pr-1 由四个 [B-α-SbW ₉O₃₃]^9– 片段组成，这些片段由有机-无机杂化中心 [Pr₄（H₂O）₁₀W 6 O ₁₃（mal）₂（OAc）]¹⁵⁺ 簇核通过 24 μ_2-O 原子融合在一起。值得注意的是，中央簇由前所未有的十核 Pr₄（H₂O）₁₀W₆O₁₃ 组成，由两种类型的羧酸配体共同修饰。这种含稀土的反单钨酸盐与混合有机羧酸盐配体的结合在 POM 化学中非常罕见。Pr-1 在涉及苯并、醛和 NH₄OAc 的环缩合反应中表现出优异的催化活性。使用 PrOH 作为绿色溶剂以显着的产率合成了一系列 2,4,5-三取代咪唑。