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Heavy Ferrocene:  A Sandwich Complex Containing Si and Ge Atoms

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Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan, and Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse D-35032 Marburg, Germany
Cite this: J. Am. Chem. Soc. 2007, 129, 34, 10340–10341
Publication Date (Web):August 3, 2007
https://doi.org/10.1021/ja0740162
Copyright © 2007 American Chemical Society
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Abstract

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The heavy analogue of ferrocene (η5-Me5C5)Fe[η5-(CPh)(CH)Si2Ge(SiMetBu2)3] 2, incorporating three heavy group 14 elements in one of the cyclopentadienyl rings, was synthesized by the reaction of the heavy lithium cyclopentadienide [η5-(CPh)(CH)Si2Ge(SiMetBu2)3]·[Li+(thf)] 1-·[Li+(thf)] with (η5-Me5C5)Fe(acac) in THF. The crystal structure analysis of 2 revealed a remarkable flattening of the C2Si2Ge five-membered ring, taking place upon complexation, in which the lengths of all skeletal bonds were intermediate between those of the typical single and double bonds. The one-electron oxidation of 2 occurred at more negative potentials than that of the parent (η5-Me5C5)2Fe:  −0.53 versus −0.32 V. The fragment MO and energy decomposition analyses revealed that the bonding in 2 is predominantly electrostatic, whereas the most important covalent bonding contribution comes from the heavy Cp- ligand to CpFe+ fragment π-donation.

§

 University of Tsukuba.

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In papers with more than one author, the asterisk indicates the name of the author to whom inquiries about the paper should be addressed.

 Philipps-Universität Marburg.

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Experimental procedure, spectral and crystallographic data for 2 including atomic positional and thermal parameters, detailed description of theoretical calculations. This material is available free of charge via the Internet at http://pubs.acs.org.

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