The complexes [π-C6H6RuX2]2 (X = Cl, Br, I, SCN) have been prepared and characterized. They react with phosphorus donors to give the monomeric π-C6H6RuX2PR3, and with cyanide and hydride ions to give cyclohexadienyl and cyclohexadiene complexes.

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The copper(II) salts of benzoic acid, o-, m-, and ^-methylbenzoic acid, and 2,6-dimethyl-and 3,5-dimethylbenzoic acid exist as dimers with reduced magnetic moments in acetone solution at room temperature. The solution nmr spectra of these compounds, as well as of [Cu(formate)z•urea]2 and [CuiacetateVureaL, exhibit quite large contact shifts of the proton resonances, consistent with a superexchange mechanism for the spin exchange. The pattern of signs of the contact shifts suggests that spin delocalization from the copper ions is into the bonding system of the carboxylate groups, although finite spin densities also appear in the systems of the aromatic rings, possibly via hyperconjugation.

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