Abstract
We present syntheses and structures of Cu(I) complexes with bis(trimethylsilyl)acetylene (BTMSA) that demonstrate the role of the ancillary ligands in the copper coordination sphere. The bonding interaction between the Cu(I) ion and the coordinated alkyne is influenced by the ancillary ligand. The ligands in this study are the bidentate ligands 1 and 2, which form monomeric, trigonal planar Cu(I) complexes with olefins and alkynes. In these complexes, the ancillary ligands vary from a hard β-diketone 1 to a softer β-diketimine 2. Earlier studies of Cu(I)−acetylene complexes have shown the Cu(I) ion to be a poor π back-bonding ion, but the results here demonstrate that the degree of back-bonding is strongly influenced by the ancillary ligands. Although ligands 1 and 2 provide very similar geometries about the Cu(I) ion, the interaction with the coordinated BTMSA is considerably different. The degree of π back-bonding for the complex with the β-diketimine ligand is indicated by the spectroscopic properties ...
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