Functionalized metal–organic frameworks have recently received significant attention in heterogeneous catalysis applications due to their high catalytic activity. In this work, a sulfate-functionalized Hf-cluster-based metal–organic framework was prepared via sulfation of a Hf-MOF, named Hf-BTC, constructed by Hf₆ clusters and 1,3,5-tricarboxylate linkers. The Hf-BTC-SO₄ material was consequently demonstrated to be an efficiently reusable superacid catalyst for a one-pot three-component reaction of pyrimido[1,2-a]benzimidazoles synthesis. The reaction catalyzed by the sulfated Hf-BTC could be carried out under mild and solvent-free conditions and give superior performance in a wide range of substrates. According to detailed investigation, the good catalytic performance of the sulfated-functionalized MOF likely originates from the high-porosity framework and the high active sites of the functionalized clusters. Importantly, the catalyst could be easy to recover and reuse the functionalized framework several times with minor changes in catalytic efficiency.

由于其高催化活性，功能化金属-有机骨架最近在多相催化应用中受到了极大的关注。在这项工作中，通过硫酸化 Hf-MOF 制备了一种硫酸盐官能化的基于 Hf 簇的金属有机骨架，命名为 Hf-BTC，由 Hf ₆簇和 1,3,5-三羧酸盐接头构成。对HF-BTC-SO ₄物质从而证明是嘧啶的一锅三组分反应[1,2的可重复使用的有效超强酸催化剂一]苯并咪唑合成。由硫酸化 Hf-BTC 催化的反应可以在温和且无溶剂的条件下进行，并在广泛的底物上表现出优异的性能。根据详细研究，硫酸化功能化 MOF 的良好催化性能可能源于高孔隙率框架和功能化簇的高活性位点。重要的是，催化剂可以很容易地回收和重复使用功能化的框架多次，催化效率的变化很小。