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The synthesis, crystal structure and properties of a zinc(II) coordination polymer viz. [Zn2(μ‐OH)(μ2‐η1:η1‐3‐mba)3] 1 (3‐mba=3‐methoxybenzoate) based on 3‐methoxybenzoic acid is described. The three crystallographically independent μ2‐η1:η1 3‐mba ligands and the unique μ‐hydoxide ligand link the two unique Zn(II) ions into an infinite chain of {Zn2O7} bitetrahedra with alternating Zn⋅⋅⋅Zn separations of 3.314 and 3.364 Å respectively. The carboxylate carbons of the symmetric bridging 3‐mba ligands serve as links between the adjacent bitetrahedra in the coordination polymer. Pyrolysis of 1 results in the formation of highly agglomerated ZnO particles having spherical morphology. 1 exhibits blue fluorescence.

The asymmetric unit of the binuclear title compound, [Cu2(C8H7O3)4(H2O)2], comprises two halves of diaquatetrakis(μ-3-methoxybenzoato-κ2 O 1:O 1′)dicopper(II) units. The paddle-wheel structure of each complex is completed by application of inversion symmetry, with the inversion centre situated at the midpoint between two CuII atoms in each dimer. The two CuII atoms of each centrosymmetric dimer are bridged by four 3-methoxybenzoate anions resulting in Cu...Cu separations of 2.5961 (11) and 2.6060 (12) Å, respectively. The square-pyramidal coordination sphere of each CuII atom is completed by an apical water molecule. Intermolecular O—H...O hydrogen bonds of weak nature link the complexes into layers parallel to (100). The three-dimensional network structure is accomplished by C—H...O hydrogen bonds interlinking adjacent layers.