| Summary: | Two ligands, 2,4-di-2-pyridyl-2,4-pentanediol (rD and mD), were employed to synthesize two Mn<sub>2</sub> complexes, [Mn<sub>2</sub>(rD)<sub>2</sub>Br<sub>2</sub>] (<b>1</b>) and [Mn<sub>2</sub>(mD)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]Br<sub>2</sub> (<b>2</b>). Compound <b>1</b> crystallized in a tetragonal space group, P4<sub>1</sub>2<sub>1</sub>2, with a novel hamburger shaped structure. A detailed study indicated that compound <b>1</b> did not contain a metal−metal bond, but antiferromagnetic coupling was observed between the Mn(III) ions. Compound <b>2</b> crystallized in a monoclinic space group, C2/c, with one Mn(II) and the other with Mn(IV). The two manganese ions were bridged by two alkoxide ligands, resulting in ferromagnetic coupling. Magnetic property studies confirm the above assignments.
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