Ultraviolet Spectra of Organometallic Compounds^1,2

Abstract

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.

Transmission of Magnetic Interactions through an Organometallic Coupler: A Novel Family of Metallocene-Substituted α-Nitronyl Aminoxyl Radicals

“…On the other hand, the absorption maximum appearing at 463 nm can be ascribed to the forbidden 3d−3d transition of the ferrocene moiety . In accord with the conjugation existing between the α-nitronyl aminoxyl and the ferrocene moiety, this band is shifted bathochromically and shows a hyperchromic effect with respect the corresponding band of unsubstituted ferrocene . Thus, the molecule of radical 1 (M = Fe) shows only small modifications of the basic electronic features of the α-nitronyl aminoxyl and ferrocene units in isolation.…”

Photochemistry of metal carbonyls

“…The species M2(CO)sX2 (X = halogen) having structure XI111 Study of the electronic structure of Mn and Re carbonyls has been carried out for several different types of complexes. Absorption band positions, Intensities, and likely assignments are set out in Table XIV.11,25,[117][118][119][120][121][122][123] The spectra of the d6 Mn(CO)6+ and Re(CO)s+ have strong similarity to the spectra of V(-I), Cr, Mo, and W carbonyls which have the same number of d electrons and are assigned accordingly. The lowest electronic transition Is assigned as the 1A1g(t2g6) -*• 3Tig(t2g5eg1) LF absorption, and the other transitions are Identified with bands found in the Cr, Mo, and W carbonyls.…”

Photochemistry of some manganese and chromium dinuclear metal carbonyl complexes in frozen gas matrices at ca. 12 K

“…On irradiation at longer wavelengths compound (18) did not undergo photoreversal as was seen for (17). 19 Higher-energy photolyses only resulted in decomposition of all species.…”