Oxidative\nCoupling of [Ge<sub>9</sub>(Si(SiMe<sub>3</sub>)<sub>3</sub>)<sub>2</sub>]<sup>2–</sup> with f Elements
Christian Gienger (14232312)Claudio Schrenk (1565533)Andreas Schnepf (1565530)Svetlana V. Klementyeva (6276995)
Abstract
We report the reactions of K<sub>2</sub>[Ge<sub>9</sub>(Hyp)<sub>2</sub>] (Hyp = Si(SiMe<sub>3</sub>)<sub>3</sub>) with\n(thf)<sub>3</sub>YbI<sub>3</sub>, ThI<sub>4</sub>, and UCl<sub>4</sub>, leading\nto the oxidative coupling of the metalloid germanium cluster to form\nthe dimeric dianion [Ge<sub>18</sub>(Hyp)<sub>4</sub>]<sup>2–</sup>. The novel dimerized Ge<sub>18</sub>-cluster was isolated and characterized\nby single-crystal X-ray diffraction analysis as a component of ionic\ncompounds [Yb(thf)<sub>6</sub>][Ge<sub>18</sub>(Hyp)<sub>4</sub>]\n(<b>1</b>) and [K(2.2.2-crypt)]<sub>2</sub>[Ge<sub>18</sub>(Hyp)<sub>4</sub>] (<b>2</b>) with two different counterions. The dihedral\nangle between two intact Ge<sub>9</sub> cages depends on the counterions,\nwhich was also studied by quantum-chemical calculations.
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