Abstract
The μ4-oxo tetranuclear magnesium compound [Mg4(μ4-oxo)(μ-tz)6] 1 (tz = 3,5-iPr2-1,2,4-triazolato) with six η1-η1-bridging triazolato ligands was prepared in a one-step reaction between MgBr2 and tzK. The solid state structure was determined by X-ray diffraction analysis showing the tetrahedral arrangement of the Mg4O core. The reaction of MgBr2 with pzK and pzH gave [Mg(pz)2(pzH)2] 2 (pz = 3,5-tBu2-pyrazolato), which contains hydrogen bonds between two different ligands, as established by X-ray crystal structure analysis. In solution, compound 2 shows a dynamic behavior involving two different processes. Line shape analysis of variable temperature NMR experiments suggests that the interconversion occurs via an η2-coordination of the pyrazolato ligand. (© Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)
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