کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1321076 | 1499868 | 2014 | 8 صفحه PDF | دانلود رایگان |
• New organometallic nickel complexes [(Phbpy)NiBr] and [(Phbpy)Ni(CF3)].
• Single crystal XRD and NMR reveal cyclometalation.
• Reversible oxidations and reduction from cyclic voltammetry.
• Partly reversible oxidations and reductions from spectroelectrochemistry.
• Oxidatively induced C–C coupling yields 2-CF3-Phbpy from [(Phbpy)Ni(CF3)].
The new organometallic nickel complex [(Phbpy)NiBr] containing the anionic tridentate N,N,C ligand 6-(phen-2-yl)-2,2′-bipyridine (Phbpy−) was synthesised from PhbpyBr and [Ni(COD)2] in excellent yields and was fully characterised (MS, NMR, single crystal XRD). [(Phbpy)NiBr] was reacted with (CF3)SiMe3 giving the CF3 complex [(Phbpy)Ni(CF3)]. Both new complexes were studied in detail by electrochemical (CV) and spectroelectrochemical (UV/vis/NIR absorption) methods. For both complexes the first one-electron reduction and the first oxidation of the Br complex occur fully reversible in the CV, while spectroelectrochemistry shows decomposition reactions. The CF3 complex is unstable in solution producing 2-CF3-Phbpy. Reactivity patterns for these reactions were discussed, also in comparison with the non-cyclometalated complex [(bpy)Ni(Mes)Br].
The new cyclometalated nickel complex [(Phbpy)NiBr] (Phbpy = (phen-2-yl)-2,2′-bipyridine) was synthesised from PhbpyBr and [Ni(COD)2]. Reaction of [(Phbpy)NiBr] with (CF3)SiMe3 gave the complex [(Phbpy)Ni(CF3)]. Both were analysed (XRD, NMR, MS) and studied by electrochemical (CV) and spectroelectrochemical (UV/vis/NIR absorption) methods revealing redox-induced activation.Figure optionsDownload as PowerPoint slide
Journal: Journal of Organometallic Chemistry - Volume 774, 15 December 2014, Pages 86–93