A Schrock-Type Germylene Complex: (η<sup>5</sup>‑C<sub>5</sub>H<sub>4</sub>Et)<sub>2</sub>(PMe<sub>3</sub>)HfGe(SiMe<sup>t</sup>Bu<sub>2</sub>)<sub>2</sub>
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Abstract
The
stable group 4 metal germylene complex (η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>Et)<sub>2</sub>(PMe<sub>3</sub>)HfGe(SiMe<sup><i>t</i></sup>Bu<sub>2</sub>)<sub>2</sub> (<b>2</b>) is readily available by the reaction of the 1,1-dilithiogermane
(<sup><i>t</i></sup>Bu<sub>2</sub>MeSi)<sub>2</sub>GeLi<sub>2</sub> with (η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>Et)<sub>2</sub>HfCl<sub>2</sub> in toluene at −50 °C, followed
by treatment with trimethylphosphine. The hafnium–germanium
bond distance of 2.6705(5) Å in <b>2</b> is indicative
of its double-bond character, being ca. 3–7% shorter than the
usual Hf–Ge single bonds. The novel hafnium germylene derivative
is classified as a Schrock-type complex, featuring a negatively polarized
nucleophilic germanium center
