A reinvestigation of the solution structure and dynamics of [Fe2(η5-C5H5)2(CO)4–n(CNMe)n], n= 1 or 2
Abstract
The 1H and 13C NMR spectra of [Fe2(η5-C5H5)2(CO)4 –n(CNMe)n], n= 1 or 2, have been reinvestigated. It is shown that [Fe2(η5-C5H5)2(CO)3(CNMe)] exists in CD2Cl2 as all four possible interconverting isomers, and the activation energy for (µ-CO)(µ-CNMe) bridge opening and closing has been determined as 9.4 kcal mol–1. This is believed to be the first determination of the activation energy for the opening of a µ-CNMe, where no other dynamic process is required to occur to obtain the product. The compound [Fe2(η5-C5H5)2(CNMe)2] exists in CD2Cl2 solution as only two of the six possible isomers, which are identified as cis-[Fe2(η5-C5H5)2(CO)2(µ-CNMe)2] and cis-[Fe2(η5-C5H5)2(µ-CO)(CO)(µ-CNMe)-(CNMe)].
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