Five novel clusters were reported, with results showing that pH and reaction temperatures have a key role in the self-assembly process.

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In the title compound, [Co(C8H7BrNO)3], the CoIII ion is coordinated in a slightly distorted octa­hedral environment by three N atoms and three O atoms from three bidentate 4-bromo-2-(methyl­imino­meth­yl)phenolate ligands. The dihedral angles between the benzene rings are 82.6 (2), 57.1 (2) and 62.9 (2)°. In the crystal, mol­ecules are linked by pairs of weak C—H⋯Br hydrogen bonds, forming inversion dimers.

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