Robust Corrole-Based Metal–Organic Frameworks with Rare 9‑Connected Zr/Hf-Oxo Clusters

• Published in: Journal of the American Chemical Society Vol. 141; no. 36; pp. 14443 - 14450
• Main Authors: Zhao, Yanming, Qi, Shibo, Niu, Zheng, Peng, Yunlei, Shan, Chuan, Verma, Gaurav, Wojtas, Lukasz, Zhang, Zhenjie, Zhang, Bao, Feng, Yaqing, Chen, Yu-Sheng, Ma, Shengqian
• Format: Journal Article
• Language: English
• Published: WASHINGTON American Chemical Society 11.09.2019; Amer Chemical Soc
• Subjects: Chemistry; Chemistry, Multidisciplinary; Physical Sciences; Science & Technology; OXYGEN; METALLOCORROLES; DIENES; MOF; MANGANESE; STABILITY; DIELS-ALDER REACTION; CHEMISTRY; CATALYZED 4+2 CYCLOADDITION; ADSORPTION
• ISSN: 0002-7863; 1520-5126
• DOI: 10.1021/jacs.9b07700

The corrole unit from the porphyrinoid family represents one of the most important ligands in the field of coordination chemistry, which creates a unique environment allowing for the observation of unusual electronic states of bound metal cations and has shown great promise in various applications. Nevertheless, studies that directly and systematically introduce these motifs in porous crystalline materials for targeting further functionalizations are still lacking. Herein, we report for the first time the construction of two robust corrole-based metal–organic frameworks (MOFs), M6(μ3-O)4­(μ3-OH)4­(OH)3­(H2O)3­(H3TCPC)3 (M = Zr for Corrole-MOF-1 and M = Hf for Corrole-MOF-2, H3TCPC = 5,10,15-tris­(p-carboxylphenyl)­corrole), which are assembled by a custom-designed C 2ν -symmetric corrolic tricarboxylate ligand and the unprecedented D 3d -symmetric 9-connected Zr6/Hf6 clusters. The resultant frameworks feature a rare (3,9)-connected gfy net and exhibit high chemical stability in aqueous solutions within a wide range of pH values. Furthermore, we successfully prepared the cationic Corrole-MOF-1­(Fe) from the iron corrole ligand, which can serve as an efficient heterogeneous catalyst for [4 + 2] hetero-Diels–Alder reactions between unactivated aldehydes and a simple diene, outperforming both the homogeneous counterpart and the porphyrinic MOF counterpart.