Abstract

SHENG, T.  and  VAHRENKAMP, H.. Metal-metal charge transfer in LnM-CN-FeCl3 complexes. An. Asoc. Quím. Argent. [online]. 2004, vol.92, n.1-3, pp.17-27. ISSN 0365-0375.

By combining the organometallic cyanides LnM-CN [LnM = Cp(dppe)Fe, Cp(dppe)Ru, Cp(PPh3)2Ru] with FeCl3the dinuclear complexes LnM-CN-FeCl3were obtained. Structure determinations have revealed configurations close to linear arrays Fe-C-N-Fe and Ru-C-N-Fe. From the n(CN) band positions in their IR spectra it can be concluded that FeCl3is a very strong electron acceptor. Accordingly, the redox potentials of the LnM-CN units are raised significantly upon attachment of FeCl3. In the visible range of the electronic spectra the complexes show a strong metal-metal charge transfer band, the energy of which is a measure of the electron donating strength of the LnM units. An analysis of the MMCT bands and their solvent dependency resulted in quantitative data on the metal-metal interactions.

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