Abstract
Reaction of [MoCp 2Br 2] (Cp = C 5H 5), in ethanol containing NEt 3 with a range of diarylamidines, Ar 1N(H)XNAr 2 (Ar 1, Ar 2 = Ph, p-MeOPh, p-MePh, p-FPh; X = CH, CMe, CPh), gives the cations [MoCp 2(Ar 1NXNAr 2)] + in which the amidinato ligands are bidentate. Cyclic voltammetry shows that the 17 electron species obtained after monoelectronic oxidation undergo a slow chemical reaction. The formal oxidation potentials depend on the amidinato X group and are related to those of similar complexes containing the isoelectronic diaryltriazenido ligands (X = N). Cathodic reduction gives species whose stabilities are dependent markedly on the X group. A plausible mechanism is suggested for the reductions.
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