Copper-Containing Polyoxometalate-Based Metal-Organic Frameworks as Highly Efficient Heterogeneous Catalysts toward Selective Oxidation of Alkylbenzenes

Dandan Li; Xinyi Ma; Quanzhong Wang; Pengtao Ma; Jingyang Niu; Jingping Wang

doi:10.1021/acs.inorgchem.9b02189

Copper-Containing Polyoxometalate-Based Metal-Organic Frameworks as Highly Efficient Heterogeneous Catalysts toward Selective Oxidation of Alkylbenzenes

Inorg Chem. 2019 Dec 2;58(23):15832-15840. doi: 10.1021/acs.inorgchem.9b02189. Epub 2019 Nov 13.

Authors

Dandan Li¹, Xinyi Ma¹, Quanzhong Wang¹, Pengtao Ma¹, Jingyang Niu¹, Jingping Wang¹

Affiliation

¹ Henan Key Laboratory of Polyoxometalate Chemistry, Institute of Molecular and Crystal Engineering, College of Chemistry and Chemical Engineering , Henan University , Kaifeng , 475004 , Henan , P. R. China.

PMID: 31721567
DOI: 10.1021/acs.inorgchem.9b02189

Abstract

With a one-pot assembly method, two copper-containing Keggin-type polyoxometalate-based metal-organic frameworks (POMOFs), i.e., [Cu^I₆(trz)₆{PW₁₂O₄₀}₂] (HENU-2, HENU = Henan University; trz = 1,2,4- triazole) and [Cu^I₃(trz)₃{PMo₁₂O₄₀}] (HENU-3), were successfully prepared and structurally characterized. These two compounds, which are generated by the extension of a crown-like {Cu₆(trz)₆} macrocycle-based sandwich-type structural unit, possess identical noninterpenetration 3D frameworks except for the polyanions difference. Additionally, both of themare assessed as highly effective heterogeneous catalysts in facilitating the oxidation of alkylbenzenes to ketone products in the presence of tert-butyl hydroperoxide. Under optimized conditions, HENU-2 can achieve a 95.2% conversion of diphenylmethane in 20 h with a 100% selectivity toward benzophenone, and it was reused for three runs with constant high activity, which outperforms most POM-based catalysts for this catalytic reaction.