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Two 4,4′-[1,3-phenyl­enebis(­oxy)]dibenzoate anions bridge two 1,10-phenanthroline-chelated ZnII cations about a center of inversion to generate the dinuclear title compound, [Zn2(C20H12O6)2(C12H8N2)2]·2H2O. The geometry about the ZnII atom is a distorted octa­hedron. In the crystal, the mol­ecules are connected by classical O—H...O hydrogen bonds, weak C—H...O hydrogen bonds and C—H...π inter­actions, forming a three dimensional network. π–π stacking is also observed between aromatic rings of adjacent mol­ecules, centroid–centroid distances are 3.753 (2), 3.5429 (16) and 3.5695 (17) Å.

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In the title salt, [Cd(C6H15NO3)2](C8H4O4), the Cd2+ cation is coordinated by six O atoms and two N atoms from two tetra­dentate 2-[bis­(2-hy­droxy­eth­yl)amino]­ethanol ligands, displaying a distorted square-anti­prismatic coordination. The terephthalate dianion does not coordinate to the cation but is connected through O...H—O hydrogen bonds of medium strength to the complex cations, leading to a layered structure extending parallel to (100).
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