The Cadmium^II Isophthalicacid Benzimidazole complex [Cd₂(C₈H₄O₄)₂ (C₇H₆N₂)₄(H₂O)₃], Triqua-bis (isophthalicacidato-O,O')-tetra (benzimidazole) bis (Cadmium^II),the Cd^II atom is coordinated by two isophthalicacid anions and two benzimidazole and one water molecule in a distorted octahedral configuration with six-coordinations geometry. And one isophthalicacid ligand chelates to the Cd^II atom through its one carboxylic O atoms, but the other isophthalicacid ligand chelates to the Cd^II atom through its two carboxylic O atoms. The same as another Cd^II atom. So we get a Binuclear Cd^II metal complexe. The fact clearly suggests not so much significant contribution from the electrostatic interaction in the Cd-O bonding in bidentate Binuclear Cd^II metal complexes as we gotten in mononuclear Mn^II metal complexes. Adjacent complex link to each other via hydrogen bonds forming the three-dimensional supramolecular structure.