Tris(1,10-phenanthroline)cadmium 3,3′-dicarb­oxy-4,4′-diazenedi­yl­dibenzoate–4,4′-diazenediyldiphthalic acid–methanol (1/0.5/1)

In the title compoud, [Cd(C(12)H(8)N(2))(3)](C(16)H(8)N(2)O(8))·0.5C(16)H(10)N(2)O(8)·CH(3)OH, the Cd(II) atom has a distorted octa­hedral coordination formed by six N atoms from three separate phenanthroline ligands. One of the 4,4′-diazenediyldiphthalic acid mol­ecules is arranged around an inversion center and possesses two –COOH groups, while the other is partially deprotonated and is a dianion for charge balance. It can be noted that, in the undeprotonated acid, the –COOH groups are disordered over two positions by rotation around the C—C bond linking the –COOH group to the phenyl ring. Surprisingly, the H atom is not involved in the disorder. In the dianion, the remaining H atom is located between the two COO groups. These deprotonated and undeprotonated mol­ecules are linked by O—H⋯O hydrogen bonds, forming a chain developing parallel to the [111] direction. The methanol solvent molecule is highly disordered; it was not considered in the final model by elimination of its contribution from the intensity data.