Abstract

Abstract Charge transfer (CT) absorptions between transition metal polyhydrides, e.g. MH2Cp2 (Cp=η-C5H5; M=Mo, W), FeH2(dppe)2, MH4(dppe)2(dppe=Ph2PCH2CH2PPh2; M=Mo, W), and organic π-acceptors such as maleic anhydride were measured. The position of the CT bands gave an Ip value of 6.3 eV for WH2Cp2. The value indicates transfer of electron from the filled non-bonding metal orbital to the acceptors. Role of the electron donor-acceptor interactions prior to insertion or substitution of transition metal hydrides is discussed.

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