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    Synthesis and Structural Characterization of Homoleptic 1,2,4-Diazaphospholide Alkaline Earth Metal Complexes

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    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
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