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In the mononuclear title complex, [Co(C9H9O3)2(H2O)2], each CoII atom is located on an inversion center and is hexacoordinated by four O atoms from two benzyloxyacetate ligands [Co—O bond lengths = 2.0487 (9) and 2.1090 (9) Å] and two water molecules [Co—O bond length = 2.0873 (9) Å] in a distorted octahedral geometry. In the crystal structure, intermolecular hydrogen bonds and π–π stacking interactions [centroid–centroid distance between phenyl rings = 3.692 (2) Å] link the molecules into a supramolecular structure.

In the mononuclear title complex, [Mg(C(12)H(8)N(2))(H(2)O)(4)](C(8)H(5)Cl(2)O(2))(2), each Mg(II) ion is hexa-coordinated by two N atoms from a 1,10-phenanthroline ligand [Mg-N = 2.233 (2) Å] and four water mol-ecules [Mg-OW = 2.033 (2) and 2.043 (1) Å] in a distorted octa-hedral geometry. A twofold rotation axis passes through the Mg atom. In the crystal structure, the cations and anions are linked by inter-molecular O-H⋯O hydrogen bonds and π-π stacking inter-actions [centroid-centroid distance = 3.804 (2) Å] into layers parallel to the ac plane.

In the title mononuclear complex, [Cu(C9H9O3)2(H2O)2], the CuII ion, located on an inversion center, is hexacoordinated by four O atoms from two benzyloxyacetate ligands [Cu—O = 1.9420 (14) and 2.2922 (14) Å] and two water molecules [Cu—O = 2.0157 (15) Å] in a distorted octahedral geometry. In the crystal structure, intermolecular O—H...O hydrogen bonds link the molecules into layers parallel to the bc plane.