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Facile Synthesis of a Polycatenane Compound Based on Ag-triazole Complexes and Phosphomolybdic Acid for the Catalytic Epoxidation of Olefins with Molecular Oxygen
oleh: Juan Du, Xinyu Liu, Jiaxin Zhang, Yucun Liu, Enwei Zhu, Guangbo Che, Mingjun Jia
Format: | Article |
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Diterbitkan: | MDPI AG 2019-06-01 |
Deskripsi
A simple and efficient approach was developed for synthesizing a metal-organic polycatenated compound composed of Ag-triazole complexes and phosphomolybdic acid (PMA) clusters. The hybrid compound, namely {[Ag<sub>2</sub>(trz)<sub>2</sub>] [Ag<sub>24</sub>(trz)<sub>18</sub>]}[PMo<sub>12</sub>O<sub>40</sub>]<sub>2</sub> (1) (trz = 1,2,4-triazole), showed high catalytic activity, selectivity and recyclability for the epoxidation of olefins with molecular oxygen as the oxidant and isobutyraldehyde as the co-reagent, and could even work well under ambient conditions. The special polycatenane framework, formed by interlocking [Ag<sub>24</sub>(trz)<sub>18</sub>]<sup>6+</sup> nanocages, provides suitable space for filling the PMA clusters. The existence of multi-interactions, including π-π stacking, Ag-Ag interactions, and electrostatic interactions, should play a determinative role in fabricating the catalytically active and stable PMA-based polycatenane catalyst for aerobic epoxidation of olefins.