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C. Pietzsch, A. Kirsten, K. Jacob, F.T. Edelmann

Mößbaueruntersuchungen zur Chelatbildung (intervalenter Elektronentransfer) in heterobimetallischen Komplexen des Ferrocens

The bimetallic 2-(dimethylaminomethyl)ferrocenyl-compounds (FcN)₃V (I), (FcN)₂VCl (II), (FcN)VCl₂ (III), (FcN)₂VOLiCl (IV), (FcN)VOCp (V), (FcN)VOacac (VI), (FcN)₂Mn (VII), (FcN)₃Fe (VIII) and (FcN)₃Tl (IX) were investigated by use of Mössbauer spectroscopy. The Mössbauer spectra were measured at 100 K and 295 K. (The (FcN)₃Tl Mössbauer spectra were measured at four different temperatures. From these measurements the enthalpy of the charge-transfer-process was estimated.) Pure ferrocene (FcH), 2-(dimethylaminomethyl)ferrocene (FcNH) and ferricinium-tetrafluoroborate ([Fc]⁺BF^-₄) were used as reference samples. Our aim was to obtain information on the intervalent electron transfer behaviour of these compounds. The complexes investigated show a linear correlation between the s electron density at the iron nucleus in the "ferricinium" part of the Mössbauer spectra and the magnetic moment measured for these compounds. A linear correlation was found for the conversion ferrocene-"ferricinium" and the measured UV/VIS¹A₁-¹E₁ band of these compounds.

Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0942-9352
Volume: 205, 02/1998
Pages: 271

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