Crystal structure of bis­{μ-4,4′-[1,3-phenyl­enebis(­oxy)]dibenzoato-κ⁴O,O′:O′′,O′′′}bis[(1,10-phenanthroline-κ²N,N′)zinc(II)] dihydrate

Two 4,4′-[1,3-phenyl­enebis(­oxy)]dibenzoate anions bridge two 1,10-phenanthroline-chelated Zn^II cations about a center of inversion to generate the dinuclear title compound, [Zn₂(C₂₀H₁₂O₆)₂(C₁₂H₈N₂)₂]·2H₂O. The geometry about the Zn^II 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.

Crystal structure of bis­{2-[bis­(2-hy­droxy­eth­yl)amino]­ethanol-κ³O,N,O′}zinc terephthalate

In the title salt, [Zn(C₆H₁₅NO₃)₂](C₈H₄O₄), the Zn^II cation, located on a centre of inversion, is coordinated by four O atoms and two N atoms from two tridentate 2-[bis­(2-hy­droxy­eth­yl)amino]­ethanol (BHEA) ligands, giving rise to a slightly distorted octa­hedral geometry. The terephthalate dianion, located about a centre of inversion, is not coordinated to Zn^II but is connected through O—H...O contacts with [Zn(BHEA)₂]²⁺ cations, leading to a three-dimensional crystal structure.

Crystal structure of bis­{2-[bis­(2-hy­droxy­eth­yl)amino]­ethanol-κ⁴O,N,O′,O′′}cadmium terephthalate

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).

Crystal structure of bis­{2-[(2-hy­droxy­eth­yl)amino]­ethanol-κ³O,N,O′}copper(II) terephthalate

The mol­ecular components of the title salt, [Cu(C₄H₁₁NO₂)₂](C₈H₄O₄), are one Cu^II cation O,N,O′-chelated by two tridentate 2-[(2-hy­droxy­eth­yl)amino]­ethanol ligands, and a terephthalate counter-dianion, located about a centre of inversion. The complex Cu^II cation is located about a centre of inversion and shows typical Jahn–Teller distortion, with two short Cu—O and two short Cu—N bonds in the equatorial plane and two long Cu—O bonds to the axial atoms. The cations are arranged in sheets parallel to (100), with the centrosymmetric terephthalate anions located between the sheets. Each anion is the acceptor of four O—H...O and two N—H...O hydrogen bonds, forming a three-dimensional network structure.