N7, O6 bridging 9-ethylguanine (9-EtGH) groups in dinuclear metal–metal bonded complexes with bond orders of one, two or four

Abstract

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.