The benzophenone dianion [diphenyloxidomethanide, (Ph₂CO)²⁻], which occurs in the well known deeply violet sodium/benzophenone tetrahydrofuran solutions, was crystallised with sodium cations in form of the two polymeric chain compounds [Na₂(Ph₂CO)(tetraglyme)]_∞1 and [Na₂(Ph₂CO)(thf)₂]_∞2. It was found to aggregate with its conjugated acid, the alcoholate (Ph₂CHO)⁻, around a central unit of sodium hydroxide, resulting in the mixed cage compound [Na₁₃(Ph₂CO)₄(Ph₂CHO)₄(OH)(mtbe)₄]·mtbe 3. The structural parameters of the benzophenone dianion indicate that a considerable amount of its negative charge is located within the phenyl rings, rather than on the formally anionic benzylic carbon atom. The topological analysis of the electron density of the monomeric model structure [Na₂(Ph₂CO)] reveals an even positive charge for this particular atom, hence (Ph₂CO)²⁻ is, despite its usual representation, not a vicinal dianion.