Facile CO 2 Cycloaddition to Epoxides by Using a Tetracarbonyl Metal Selenotungstate Derivate [{Mn(CO) 3} 4(Se 2 W 11 O 43)] 8

Jingkun Lu, Xinyi Ma, Vikram Singh, Yujiao Zhang, Ping Wang, Junwei Feng, Pengtao Ma, Jingyang Niu, Jingping Wang

Inorg Chem. 2018 Dec 3;57(23):14632-14643.

PMID: 30427667

Abstract:

A novel polyoxometalate cluster, i.e., Na1.5H4.5[(CH3)4N]2{[Mn(CO)3]4(Se2W11O43)}·9H2O (1), has been successfully synthesized under moderately acidic conditions. Compound 1 contains four electron-donating {Mn(CO)3}+ organometallic entities, which are grafted over an unprecedented heteropolytungstate electron-acceptor group. Compound 1 was further structurally characterized by various physicochemical techniques like elemental analyses, inductively coupled plasma (ICP) analyses, IR and UV-vis spectroscopy, electrochemistry, and single-crystal X-ray diffraction, and so on. The polyoxoanion of 1 comprises a novel {Se2W11} fragment, which is obtained from molecular assembly of rare {SeW3} and {SeW8} species. Evaluation of the data from solution-state IR spectrum showed excellent agreement with the solid state IR spectrum, indicating the intact clusters in the CH3CN/Na2SO4 solvent. Also, negative electrospray ionization mass spectrometry (ESI-MS) was an alternative tool to verify the stability of 1 in the mixed solvent. Additionally, the resulting hybrid can act as a catalyst for cyclic carbonate formation from the reactants epoxides and CO2 under modest reaction conditions in conjunction with a 1-ethyl-1-methylpyrrolidinium bromide (2). The good activity can be substantiated due to the cooperative influence of polyoxoanion and Br- ions. Complex 1 can also be easily recycled and reused three times without obvious decrease of catalytic activity.

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AP157365452	1-Ethyl-1,2,5,6-tetrahydro-4-methyl-2,6-dioxo-3-pyridinecarbonitrile		157365-45-2	Price