Four-Electron Oxidative Dehydrogenation Induced by Proton-Coupled Electron Transfer in Ruthenium(III) Complex with 2-(1,4,5,6-Tetrahydropyrimidin-2-yl)phenolate
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- 作者：Ryoji Mitsuhashi ; Takayoshi Suzuki ; Yukinari Sunatsuki
- 刊名：Inorganic Chemistry
- 出版年：2013
- 出版时间：September 3, 2013
- 年：2013
- 卷：52
- 期：17
- 页码：10183-10190
- 全文大小：484K
- 年卷期：v.52,no.17(September 3, 2013)
- ISSN：1520-510X
文摘
New ruthenium(II or III) complexes with general formula [Ru(O-N)(bpy)2]n+ (O-N = unsymmetrical bidentate phenolate ligand; bpy = 2,2鈥?bipyridine) were synthesized, and their crystal structures and electrochemical properties were characterized. RuII complexes with 2-(2-imidazolinyl)phenolate (Himn鈥?/sup>) or 2-(1,4,5,6-tetrahydropyrimidin-2-yl)phenolate (Hthp鈥?/sup>) could be deprotonated by addition of excess KOtBu, although the deprotonated species were easily reprotonated by exposure to air. Unlike these RuII complexes, their RuIII analogs showed interesting ligand oxidation reactions upon addition of bases. With [RuIII(Himn)(bpy)2]2+, two-electron oxidation of Himn鈥?/sup> and reduction of the RuIII center resulted in conversion of the 2-imidazolinyl group to a 2-imidazolyl group. On the other hand, the corresponding Hthp鈥?/sup> complex exhibited four-electron oxidation of the ligand to form 2-(2-pyrimidyl)phenolate (pym鈥?/sup>). These aromatization reactions of imidazolinyl and 1,4,5,6-tetrahydropyrimidyl groups were also achieved by the electrochemically generated RuIII complexes.