Biferrocene NCN pincer metal-d8 complexes: Synthesis, reaction chemistry and cyclovoltammetric studies
| Autor: | Heinrich Lang, Stefan Köcher, Gerard van Koten, Gerard P. M. van Klink |
|---|---|
| Přispěvatelé: | Homogene katalyse en materialen, Dep Scheikunde |
| Rok vydání: | 2006 |
| Předmět: |
Chemistry
Organic Chemistry Inorganic chemistry chemistry.chemical_element Sonogashira coupling Biochemistry Chemical synthesis Medicinal chemistry Redox Pincer movement Inorganic Chemistry Metal chemistry.chemical_compound Ferrocene visual_art Materials Chemistry visual_art.visual_art_medium Physical and Theoretical Chemistry Platinum Palladium |
| Popis: | 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-C5H4C C-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-C5H4C C-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. |
| Databáze: | OpenAIRE |
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