Abstract
The reduction products, resulting from treatment of dibenzoylmethane dissolved in an ether, with alkali metals, were studied by means of optical (u.v., Vis and near i.r.) and electron spin resonance (E.S.R.) spectroscopy. Optical absorption spectra confirmed the three step reduction process proposed previously for this compound. Evidence was found for the existence of monomer-dimer equilibria both in solutions of the diamagnetic anion and paramagnetic dianion of dibenzoylmethane. E.S.R. spectra of the paramagnetic ions randomly oriented in a rigid matrix proved the presence of monoradicals and two paramagnetic dimer conformations with triplet ground states. Computer simulations enabled the analysis of the rigid medium spectra. The experimental data provided by the optical and E.S.R. study allowed a proposal for the structures of the two dimers and the mechanism leading to their formation. The computer simulations were based on a lineshape formula for the characteristic rigid matrix E.S.R. spectra produced...
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