New Aqua N-Heterocyclic Carbene Ru(II) Complexes with Two-Electron Process as Selective Epoxidation Catalysts: An Evaluation of Geometrical and Electronic Effects

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• 作者：Mohamed Dakkach ; Ahmed Atlamsani ; Teodor Parella ; Xavier Fontrodona ; Isabel Romero ; Montserrat Rodr铆guez
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：May 6, 2013
• 年：2013
• 卷：52
• 期：9
• 页码：5077-5087
• 全文大小：459K
• 年卷期：v.52,no.9(May 6, 2013)
• ISSN：1520-510X

文摘

New ruthenium complexes with general formula [Ru^II(T)(CN-Me)X]ⁿ⁺ (X = Cl^{鈥?/sup> or H₂O; T = 2,2鈥?6鈥?2鈥?terpyridine, trpy, or N,N-bis(2-pyridyl)ethylamine, bpea; CN-Me = N-methyl-N鈥?2-pyridylimidazolium) have been prepared. The complexes obtained have been characterized in solution by spectroscopic (1D- and 2D-NMR and UV鈥搗is) techniques, mass spectrometry, and elemental analysis. The chloro complexes have also been characterized by X-ray diffraction analysis. The redox properties of all the compounds were studied by CV revealing, for the reported Ru鈥揙H₂ complexes, bielectronic Ru(IV/II) redox processes throughout a wide pH range. The catalytic activity of aquo complexes was evaluated in the epoxidation of olefins using PhIO as oxidant, displaying in general good yields and high selectivities for the epoxide product. The influence of electronic and geometrical factors on the spectroscopic and electrochemical properties as well as on the catalytic activity is discussed.}