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Aerobic oxidative dehydrogenation of coordinated imidazoline units of pincer ruthenium complex |
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| Authors: | Shusaku Maeda Takakazu Yamamoto Takaki Kanbara |
| Institution: | a Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan b Institute for Molecular Science, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan c Tsukuba Research Center for Interdisciplinary Materials Science (TIMS), University of Tsukuba, 1-1-1 Ten-noudai, Tsukuba 305-8573, Japan d Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Ten-noudai, Tsukuba 305-8573, Japan |
| Abstract: | A new pincer ruthenium complex (1; RuL1(tpy)](PF6); L1 = 1,3-di(2-imidazoline-2-yl)benzene, tpy = 2,2′:6′,2″-terpyridine) having a κ3NCN pincer ligand with two imidazoline units and related ruthenium complexes were synthesized and characterized. The imidazoline units of 1 were oxidized in air to give an imidazole-ligated pincer complex (2; RuL2(tpy)](PF6); L2 = 1,3-di(2-imidazolyl)benzene). Results of the 1H NMR spectroscopic and cyclic voltammetric studies of the complexes indicate that the σ-donor character of the pincer ligand of 1 induces the Ru-promoted oxidative dehydrogenation of coordinated imidazoline moieties to imidazole units with oxygen in air. |
| Keywords: | Ruthenium Pincer ligand Imidazoline Imidazole Oxidative dehydrogenation |
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