σ-SiH Complexes of Copper: Experimental Evidence and Computational Analysis
摘要:
Copper and gold complexes 2-4 of the diphosphine-hydrosilane [PH2P(o-C6H4)](2)MeSiH ligand 1 have been prepared, and their bonding situation has been analyzed experimentally (NMR, IR, X-ray diffraction) and computationally (geometry optimizations, NBO analyses). The sigma-SiH bond remains pendant in the gold complex 4 but engages into a weak side-on coordination to copper. This bonding interaction slightly strengthens when the metal becomes more electron deficient, consistent with essentially pure sigma-SiH-to-copper donation. Complexes 2 and 3 provide very rare examples of a-bond coordination to a coinage metal.