Synthesis and Characterization of a Crown-Shaped 36-Molybdate Cluster and Application in Catalyzing Knoevenagel Condensation

Qiaofei Xu; Baijie Xu; Hui Kong; Peipei He; Jiawei Wang; Thirumurthy Kannan; Pengtao Ma; Jingping Wang; Jingyang Niu

doi:10.1021/acs.inorgchem.0c01122

Synthesis and Characterization of a Crown-Shaped 36-Molybdate Cluster and Application in Catalyzing Knoevenagel Condensation

Inorg Chem. 2020 Aug 3;59(15):10665-10672. doi: 10.1021/acs.inorgchem.0c01122. Epub 2020 Jul 14.

Authors

Qiaofei Xu¹, Baijie Xu¹, Hui Kong¹, Peipei He¹, Jiawei Wang¹, Thirumurthy Kannan¹, Pengtao Ma¹, Jingping Wang¹, Jingyang Niu¹

Affiliation

¹ Henan Key Laboratory of Polyoxometalate Chemistry, Institute of Molecule and Crystal Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, PR China.

PMID: 32662637
DOI: 10.1021/acs.inorgchem.0c01122

Abstract

A novel crown-shaped 36-molybdate cluster with organophosphonate-functionalized polyoxomolybdates, (NH₄)₁₇Na₇H₁₂[Co(H₂O)TeMo₆O₂₁{N(CH₂PO₃)₃}]₆·42H₂O, has been successfully synthesized and well-characterized. It owns the highest nuclearity in the family of organophosphonate-based polyoxometalates reported so far. Furthermore, for the first time in the field, we illustrated that polyoxomolybdate could work as an effective heterogeneous catalyst for the Knoevenagel condensation reaction with high TOF (7714 h^-1) and good recyclability. Impressively, the catalytic performance of 1 was also tested successfully in a large scale (∼10 g) reaction, where 89% of reaction yield and 3216 of TON were afforded.