Evidence is presented for the existence of electronic absorption bands typical of the transition metal-carbon bond. This evidence is based on a correlative qualitative study of the ultraviolet spectra of organo derivatives of iron, manganese, chromium, and molybdenum. The characteristic features of these spectra are described.The discovery of dicyclopentadienyliron (ferrocene)4 and the subsequent proposal5 of the pi-(1) A preliminary report of this paper was presented at the Meeting of the XVIIth International Congress of Pure and Applied Chemistry, Munich, September 1959, see M.

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