N7,O6 bridging 9-ethylguanine (9-EtGH) groups in dinuclear metal-metal bonded complexes with bond orders of one, two or four
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Dinuclear metal carboxylates of Mo, Ru and Rh with 2 equiv. of 9-ethylguanine (9-EtGH) give complexes containing [M2(O2CR)2(9-EtGH)2(solv)2]2+ cations; structural characterization shows these to contain unusual N7,O6-bridging 9-EtGH groups in 'head-to-tail' (HT) or 'head-to-head' (HH) orientations, and establishes this bridging mode for metal-metal bond orders of 1-4.