Synthesis and Structural Characterization of Homoleptic 1,2,4-Diazaphospholide Alkaline
Earth Metal Complexes
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Abstract
The alkaline earth metal complexes
[(η<sup>2</sup>-3,5-<i>t</i>Bu<sub>2</sub>dp)(μ-Mg)(η<sup>1</sup>:η<sup>1</sup>-3,5-<i>t</i>Bu<sub>2</sub>dp)]<sub>2</sub> (<b>2</b>), {[(η<sup>2</sup>-3,5-<i>t</i>Bu<sub>2</sub>dp)(μ-η<sup>2</sup>:η<sup>5</sup>-3,5-<i>t</i>Bu<sub>2</sub>dp)(μ-η<sup>2</sup>:η<sup>1</sup>-3,5-<i>t</i>Bu<sub>2</sub>dp)Ca]<sub>2</sub>(μ-Ca)} (<b>3</b>), [Sr(3,5-<i>t</i>Bu<sub>2</sub>dp)<sub>2</sub>]<sub><i>m</i></sub> (<b>4</b>), [Ba(3,5-<i>t</i>Bu<sub>2</sub>dp)<sub>2</sub>)]<sub><i>n</i></sub> (<b>5</b>), and [η<sup>1</sup>-{H(3,5-<i>t</i>Bu<sub>2</sub>dp)}<sub>2</sub>Ca(η<sup>2</sup>-3,5-<i>t</i>Bu<sub>2</sub>dp)<sub>2</sub>] (<b>6</b>), bearing bulky 1,2,4-diazaphospholide ligands [3,5-<i>t</i>Bu<sub>2</sub>dp]<sup>−</sup> ([3,5-<i>t</i>Bu<sub>2</sub>dp]<sup>−</sup> = 3,5-di<i>-tert</i>-butyl-1,2,4-diazaphospholide), were prepared. The structures of
magnesium and calcium 1,2,4-diazaphospholide complexes represent homoleptic
1,2,4-diazaphospholide alkaline earth metal oligomers with a novel
array of metal–ligand binding modes
