Biferrocene NCN pincer metal-d complexes: Synthesis, reaction chemistry and cyclovoltammetric studies |
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| Authors: | Stefan Köcher Gerard van Koten |
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| Institution: | a Technische Universität Chemnitz, Fakultät für Naturwissenschaften, Institut für Chemie, Lehrstuhl Anorganische Chemie, Straße der Nationen 62, 09111 Chemnitz, Germany
b Debye Institute, Organic Synthesis and Catalysis, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands |
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| Abstract: | The synthesis of biferrocene-bridged NCN pincer palladium and platinum complexes (NCN = 1-C6H2(CH2NMe2)2-3,5]−) is discussed. Sonogashira cross-coupling of (η5-C5H4)Fe(η5-C5H4C CH)]2 (1) with I-1-NCN-4-X (2a, X = H; 2b, X = Br) produces (η5-C5H4)Fe(η5-C5H4CC-1-NCN-4-X)]2 (3a, X = H; 3b, X = Br). Homobimetallic 3b further reacts with Pd2(dba)3 · CHCl3] (4) or Pt(tol)2(SEt2)]2 (5) (dba = dibenzylidene acetone, tol = 4-tolyl), respectively, to give tetrametallic (η5-C5H4)Fe(η5-C5H4CC-4-NCN-1-MBr)]2 (6, M = Pd; 7, M = Pt) in which NCN-MBr fragments are connected by a biferrocene unit. Cyclovoltammetric studies show that the ferrocene moieties can independently be oxidized. The difference of the Fe(II)/Fe(III) redox couples amounts to ca. 300 mV and is not affected by the nature of the NCN pincer metal moities. |
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| Keywords: | Biferrocene NCN pincer Iron Palladium Platinum Tetrametallic Cyclovoltammetry |
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