In the title compound, [Rh(C22H32N3O5)(CO)2], the RhI atom is coordinated by two carbonyl ligands and two tropolonate O atoms in a distorted square-planar geometry. It is an example of a new type of tropolone derivative that has not been characterized via solid-state methods. Weak intra­molecular C—H⋯N and inter­molecular C—H⋯O hydrogen bonds, and π–π stacking inter­actions between the tropolone rings [centroid–centroid distance = 3.590 (8) Å] are observed in the crystal structure.

Four binary charge-transfer complexes were made using pyromellitic acid dianhydride (pmda), all of which show alternating donor and acceptor stacks, which have weak C—H⋯O hydrogen bonds connecting the donor and acceptor mol­ecules.

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The title compound [systematic name: (E)-2-hy­droxy-5-(phenyl­diazen­yl)cyclo­hepta-2,4,6-trien-1-one], C13H10N2O2, is essentially planar with an r.m.s. deviation of 0.036 (2) Å and a dihedral angle of 1.57 (8)° between the phenyl and tropolone rings. In the crystal, mol­ecules are linked by pairs of O—H⋯O hydrogen bonds into inversion dimers. The dimers are further connected by C—H⋯O hydrogen bonds and π–π stacking inter­actions, with centroid–centroid distances of 3.6934 (9) and 3.6282 (9) Å.

The title compound, C32H28O4, crystallizes with two conformers, α and β, in the asymmetric unit. In both conformers, the benzo­yl and methoxy­phen­yl groups are in cis positions. The cyclo­butane rings are puckered, with average absolute torsion angles of 10.8 (2) and 11.4 (1)° for conformers α and β, respectively. The crystal packing is stabilized by weak inter­molecular C—H⋯O hydrogen bonds and benzene π–π inter­actions.