Abstract
Two ligands, 2,4-di-2-pyridyl-2,4-pentanediol (rD and mD), were employed to synthesize two Mn2 complexes, [Mn2(rD)2Br2] (1) and [Mn2(mD)2(H2O)2]Br2 (2). Compound 1 crystallized in a tetragonal space group, P41212, with a novel hamburger shaped structure. A detailed study indicated that compound 1 did not contain a metal–metal bond, but antiferromagnetic coupling was observed between the Mn(III) ions. Compound 2 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.
Highlights
Manganese containing coordination complexes are of great interest due to their unique magnetic properties [1,2,3] as well as their variety of functions in chemistry [4,5,6]
For a comparison in magnetic property studies, we used the same procedure for preparing compound 1 to synthesize [Mn2(mD)2(H2O)2]Br2 (2)
We report on the preparation of two 2,4-di-2-pyridyl-2,4-pentanediol ligands, which were used to prepare two Mn2 complexes: [Mn2(rD)2Br2] (1) and [Mn2(mD)2(H2O)2]Br2 (2)
Summary
Manganese containing coordination complexes are of great interest due to their unique magnetic properties [1,2,3] as well as their variety of functions in chemistry [4,5,6]. Because the unpaired electrons on the metal centers are paired, this moiety is diamagnetic Except for this example, there are no reports in the literature of a capped form of a structure with a direct Mn–Mn bond. In our attempts to use the 2-(2-pyridyl)-isopropanol (dmhmp-H) ligand to synthesize a manganese cluster, we accidently but repeatedly isolated a small amount of a capped form of an Mn2 complex. Armed with the pure ligands, we were able to generate isolable amounts of the capped form of the [Mn2(rD)2Br2] (1) complex. For a comparison in magnetic property studies, we used the same procedure for preparing compound 1 to synthesize [Mn2(mD)2(H2O)2]Br2 (2). The magnetic properties of compound 2 remained unreported, a similar compound with different counter ions, [Mn2(mD)2(H2O)2](NO3), was reported by Shopov and co-workers [27]. We describe the novel structure of compound 1 and the magnetic properties of both compounds 1 and 2
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