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Macrocyclic Di- and Tetranuclear Osmacycloferrocenophanes,1

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journal contribution
posted on 2002-08-30, 00:00 authored by Ekkehard Lindner, Christoph S. Ayasse, Klaus Eichele, Manfred Steimann
The novel dinuclear and tetranuclear ortho-, meta-, and para-osmacycloferrocenophanes [η5-C5H4(CH2)n-1,m-C6H4(CH2)nOs(CO)4(CH2)n-1,m-C6H4(CH2)nC5H45]xFex (n = 2−4, m = 2−4; x = 1: 3ah; x = 2: 4ah) have been made available by the reaction of the corresponding bis(triflates) [η5-C5H4(CH2)n-1,m-C6H4(CH2)nOTf]2Fe (2ah) with Na2[Os(CO)4] in refluxing dimethyl ether. The macrocycles of 3b,c,e and 4a,h were investigated by X-ray structural analyses and consist of an extended hydrocarbon skeleton containing additionally two and four transition metal centers, respectively. In the case of the dinuclear osmacycloferrocenophanes 3ah the redox behavior was examined by means of cyclic voltammetry, and the results were compared with those of the bis(alcohols) 1ah, which were used as starting compounds for the bis(triflates) 2ah. With increasing chain length the ferrocene unit is easier oxidized, and in the case of 3fh the E1/2 values are in the region of diethylferrocene.

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