Four-Electron Oxidative Dehydrogenation Induced by Proton-Coupled Electron Transfer in Ruthenium(III) Complex with 2-(1,4,5,6-Tetrahydropyrimidin-2-yl)phenolate
作者:Ryoji Mitsuhashi、Takayoshi Suzuki、Yukinari Sunatsuki
DOI:10.1021/ic401667v
日期:2013.9.3
New ruthenium(II or III) complexes with general formula [Ru(O-N)(bpy)2]n+ (O-N = unsymmetrical bidentate phenolate ligand; bpy = 2,2′-bipyridine) were synthesized, and their crystal structures and electrochemical properties were characterized. RuII complexes with 2-(2-imidazolinyl)phenolate (Himn–) or 2-(1,4,5,6-tetrahydropyrimidin-2-yl)phenolate (Hthp–) could be deprotonated by addition of excess
合成了通式[Ru(ON)(bpy)2 ] n +(ON =不对称双齿酚盐配体; bpy = 2,2'-联吡啶)的钌(II或III)配合物,其晶体结构和电化学性能被表征。通过添加过量的KO t Bu,可以使Ru II与2-(2-咪唑啉基)酚盐(Himn –)或2-(1,4,5,6-四氢嘧啶-2-基)酚盐(Hthp –)的配合物去质子化,尽管去质子化的物种很容易通过暴露在空气中而被质子化。与这些Ru II配合物不同,它们的Ru III类似物在添加碱后显示出有趣的配体氧化反应。与[RuIII(Himn)(联吡啶)2 ] 2+,Himn的双电子氧化-还原钌的III中心导致2-咪唑啉基的转化成2-咪唑基。另一方面,相应的Hthp –配合物表现出配体的四电子氧化,形成2-(2-嘧啶基)酚盐(pym –)。咪唑啉基和1,4,5,6-四氢嘧啶基的这些芳构化反应也可以通过电化学生成的Ru III络合物来实现。