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A Silylene-Germylene Molecule Containing a SiI-GeI Single Bond.

The first isolable silylene-germylene complex 5 was assembled by a salt metathesis reaction between the germylene anion 3 and N-heterocyclic chlorosilylene 4, and structurally characterized. The central structure of 5 demonstrates a remarkable gauche-bent geometry with the silylene and germylene units, which are interconnected by a Si-Ge bond with the distance of 2.4498(9) Å. This value is not only perceptibly longer than the distances known in doubly bonded germasilenes, and also slightly longer than those in germylsilanes. The DFT calculations on 5 confirmed a nearly nonpolar SiI -GeI single bond nature and its bonding orbital, as well as the aromatiity of C3NGe-rings in 3 and 5. The latter increases molecular stability of 3 and 5, and makes the preparation of silylene-germylene complex 5 a reality.