Tris(1,10-phenanthroline)cadmium 3,3'-dicarb-oxy-4,4'-diazenedi-yl-dibenzoate-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 octa-hedral coordination formed by six N atoms from three separate phenanthroline ligands. One of the 4,4'-diazenediyldiphthalic acid mol-ecules 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 mol-ecules 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.