Some metal derivatives of the [C5(CO2Me)5]– anion (cpp–) are described, of which transition metal complexes M(cpp)2 are fully ionised in aqueous solution and the mixed complex Ru(η-C5H5)[η-C5(CO2Me)5] contains a symmetrically bonded cpp ring; covalent Group IB metal complexes M1(cpp)(PPh3) react further with PPh3 to give ionic [M(PPh3)2](cpp).
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Journal of the Chemical Society, Chemical Communications
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